TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Šućurović, Katarina
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Krstić, Sanja
AU  - Bošković-Vragolović, Nevenka
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6806
AB  - In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds.
AB  - U ovom radu je određivan koeficijent prenosa mase fluid-zid u inverznofluidizovanom sloju primenom adsorpcione metode. Eksperimenti su vršeni u koloni  prečnika 45 mm sa sferičnim i nesferičnim česticama polipropilena i polietilena  prečnika 3.3-4.9 mm i gustine oko 930 kg m-3. Kao fluidizacioni medijum korišćen je  razblaženi rastvor metilenski plavog koji je adsorbovan na delu površine kolone na  silikagelu. Dobijeni rezultati pokazali su da prisustvo čestica pri inverznoj  fluidizaciji ne doprinosi značajno prenosu mase u poređenju sa uticajem čestica na  prenos mase u konvencionalno fluidizovanim slojevima. Zbog toga je u analizu uveden  koncept pseudofluida i izvedena je empirijska korelacija za određivanje koeficijenta  prenosa mase. Izvršeno je poređenje dobijenih rezultata sa literaturnim korelacijama za  inverznu i konvencionalnu fluidizacije.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Mass transfer in inverse fluidized beds
T1  - Prenos mase u inverzno fluidizovanom sloju
EP  - 919
IS  - 9
SP  - 905
VL  - 88
DO  - 10.2298/JSC230116016J
ER  - 

@article{
author = "Jaćimovski, Darko and Šućurović, Katarina and Đuriš, Mihal and Arsenijević, Zorana and Krstić, Sanja and Bošković-Vragolović, Nevenka",
year = "2023",
abstract = "In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds., U ovom radu je određivan koeficijent prenosa mase fluid-zid u inverznofluidizovanom sloju primenom adsorpcione metode. Eksperimenti su vršeni u koloni  prečnika 45 mm sa sferičnim i nesferičnim česticama polipropilena i polietilena  prečnika 3.3-4.9 mm i gustine oko 930 kg m-3. Kao fluidizacioni medijum korišćen je  razblaženi rastvor metilenski plavog koji je adsorbovan na delu površine kolone na  silikagelu. Dobijeni rezultati pokazali su da prisustvo čestica pri inverznoj  fluidizaciji ne doprinosi značajno prenosu mase u poređenju sa uticajem čestica na  prenos mase u konvencionalno fluidizovanim slojevima. Zbog toga je u analizu uveden  koncept pseudofluida i izvedena je empirijska korelacija za određivanje koeficijenta  prenosa mase. Izvršeno je poređenje dobijenih rezultata sa literaturnim korelacijama za  inverznu i konvencionalnu fluidizacije.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Mass transfer in inverse fluidized beds, Prenos mase u inverzno fluidizovanom sloju",
pages = "919-905",
number = "9",
volume = "88",
doi = "10.2298/JSC230116016J"
}

Jaćimovski, D., Šućurović, K., Đuriš, M., Arsenijević, Z., Krstić, S.,& Bošković-Vragolović, N.. (2023). Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 88(9), 905-919.
https://doi.org/10.2298/JSC230116016J

Jaćimovski D, Šućurović K, Đuriš M, Arsenijević Z, Krstić S, Bošković-Vragolović N. Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society. 2023;88(9):905-919.
doi:10.2298/JSC230116016J .

Jaćimovski, Darko, Šućurović, Katarina, Đuriš, Mihal, Arsenijević, Zorana, Krstić, Sanja, Bošković-Vragolović, Nevenka, "Mass transfer in inverse fluidized beds" in Journal of the Serbian Chemical Society, 88, no. 9 (2023):905-919,
https://doi.org/10.2298/JSC230116016J . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Pešić, Radojica
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Bošković-Vragolović, Nevenka
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5052
AB  - The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.
PB  - Taylor & Francis Online
T2  - Particulate Science and Technology
T1  - Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime
EP  - 83
IS  - 1
SP  - 75
VL  - 41
DO  - https://doi.org/10.1080/02726351.2022.2053015
ER  - 

@article{
author = "Brzić, Danica and Pešić, Radojica and Arsenijević, Zorana and Đuriš, Mihal and Bošković-Vragolović, Nevenka and Kaluđerović-Radoičić, Tatjana",
year = "2022",
abstract = "The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.",
publisher = "Taylor & Francis Online",
journal = "Particulate Science and Technology",
title = "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime",
pages = "83-75",
number = "1",
volume = "41",
doi = "https://doi.org/10.1080/02726351.2022.2053015"
}

Brzić, D., Pešić, R., Arsenijević, Z., Đuriš, M., Bošković-Vragolović, N.,& Kaluđerović-Radoičić, T.. (2022). Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology
Taylor & Francis Online., 41(1), 75-83.
https://doi.org/https://doi.org/10.1080/02726351.2022.2053015

Brzić D, Pešić R, Arsenijević Z, Đuriš M, Bošković-Vragolović N, Kaluđerović-Radoičić T. Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology. 2022;41(1):75-83.
doi:https://doi.org/10.1080/02726351.2022.2053015 .

Brzić, Danica, Pešić, Radojica, Arsenijević, Zorana, Đuriš, Mihal, Bošković-Vragolović, Nevenka, Kaluđerović-Radoičić, Tatjana, "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime" in Particulate Science and Technology, 41, no. 1 (2022):75-83,
https://doi.org/https://doi.org/10.1080/02726351.2022.2053015 . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Brzić, Danica
AU  - Garić-Grulović, Radmila
AU  - Pjanović, Rada
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Bošković-Vragolović, Nevenka
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5064
AB  - In this work the theoretical model for heat transfer from a wall to a
liquid-solid fluidized bed by liquid convective mechanism has been proposed.
The model is based on thickness of boundary layer and film theory. The key
parameter in the model is the distance between two adjacent particles which
collide with the wall. According to the proposed model, the liquid convective
heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase
flow. Additionally, the wall-to-bed heat transfer coefficient has been measured
experimentally in water –glass particles fluidized bed, for different particle sizes.
Comparison of the model prediction with experimental data has shown that size
of the particles strongly influences the mechanism of heat transfer. For fine
particles of 0.8 mm in diameter, the liquid convective heat transfer model
represents adequately the experimental data, indicating that particle convective
mechanism is negligible. For coarse particles of 1.5 - 2 mm in diameter, the
liquid convective heat transfer mechanism accounts for 60 % of the overall heat
transfer coefficient
AB  - У овом раду развијен је теоријски модел преноса топлоте конвективним механизмом
са зида колоне на течност у партикулативно флуидизованом слоју. Модел је заснован на
дебљини граничног слоја и теорији филма. Кључни параметар модела је растојање између
двe суседне честице које се сударају са зидом колоне. Према предложеном моделу пренос
топлоте конвекцијом на течност у флуидизованом слоју је 4 до 5 пута интензивнији него у
једнофазном току. Коефицијенти преноса топлоте су експериментално одређени у
флуидизованом слоју вода-стаклене сфере, за различите пречнике честица. Поређење
експерименталних резултата и предвиђања модела је показало да пречник честица значајно
утиче на механизам преноса топлоте. За веома ситне честице пречника 0.8 mm, модел
преноса топлоте конвекцијом на течност у потпуности репрезентује експерименталне
резултате, указујући да је пренос топлоте честицама занемарљив. За крупне честице,
пречника 1.5 -2 mm, конвективни пренос на течност чини 60 % од укупног коефицијента
преноса топлоте
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Heat transfer by liquid convection in particulate fluidized beds
T1  - ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ
DO  - 10.2298/JSC211216020J
ER  - 

@article{
author = "Jaćimovski, Darko and Brzić, Danica and Garić-Grulović, Radmila and Pjanović, Rada and Đuriš, Mihal and Arsenijević, Zorana and Bošković-Vragolović, Nevenka",
year = "2022",
abstract = "In this work the theoretical model for heat transfer from a wall to a
liquid-solid fluidized bed by liquid convective mechanism has been proposed.
The model is based on thickness of boundary layer and film theory. The key
parameter in the model is the distance between two adjacent particles which
collide with the wall. According to the proposed model, the liquid convective
heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase
flow. Additionally, the wall-to-bed heat transfer coefficient has been measured
experimentally in water –glass particles fluidized bed, for different particle sizes.
Comparison of the model prediction with experimental data has shown that size
of the particles strongly influences the mechanism of heat transfer. For fine
particles of 0.8 mm in diameter, the liquid convective heat transfer model
represents adequately the experimental data, indicating that particle convective
mechanism is negligible. For coarse particles of 1.5 - 2 mm in diameter, the
liquid convective heat transfer mechanism accounts for 60 % of the overall heat
transfer coefficient, У овом раду развијен је теоријски модел преноса топлоте конвективним механизмом
са зида колоне на течност у партикулативно флуидизованом слоју. Модел је заснован на
дебљини граничног слоја и теорији филма. Кључни параметар модела је растојање између
двe суседне честице које се сударају са зидом колоне. Према предложеном моделу пренос
топлоте конвекцијом на течност у флуидизованом слоју је 4 до 5 пута интензивнији него у
једнофазном току. Коефицијенти преноса топлоте су експериментално одређени у
флуидизованом слоју вода-стаклене сфере, за различите пречнике честица. Поређење
експерименталних резултата и предвиђања модела је показало да пречник честица значајно
утиче на механизам преноса топлоте. За веома ситне честице пречника 0.8 mm, модел
преноса топлоте конвекцијом на течност у потпуности репрезентује експерименталне
резултате, указујући да је пренос топлоте честицама занемарљив. За крупне честице,
пречника 1.5 -2 mm, конвективни пренос на течност чини 60 % од укупног коефицијента
преноса топлоте",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Heat transfer by liquid convection in particulate fluidized beds, ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ",
doi = "10.2298/JSC211216020J"
}

Jaćimovski, D., Brzić, D., Garić-Grulović, R., Pjanović, R., Đuriš, M., Arsenijević, Z.,& Bošković-Vragolović, N.. (2022). Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society..
https://doi.org/10.2298/JSC211216020J

Jaćimovski D, Brzić D, Garić-Grulović R, Pjanović R, Đuriš M, Arsenijević Z, Bošković-Vragolović N. Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society. 2022;.
doi:10.2298/JSC211216020J .

Jaćimovski, Darko, Brzić, Danica, Garić-Grulović, Radmila, Pjanović, Rada, Đuriš, Mihal, Arsenijević, Zorana, Bošković-Vragolović, Nevenka, "Heat transfer by liquid convection in particulate fluidized beds" in Journal of the Serbian Chemical Society (2022),
https://doi.org/10.2298/JSC211216020J . .

TY  - JOUR
AU  - Jaćimovski, Darko R.
AU  - Brzić, Danica V.
AU  - Garić-Grulović, Radmila V.
AU  - Pjanović, Rada V.
AU  - Đuriš, Mihal M.
AU  - Arsenijević, Zorana L.J.
AU  - Bošković-Vragolović, Nevenka M.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5231
AB  - In this work the theoretical model for heat transfer from a wall to a liquid-solid fluidized bed by liquid convective mechanism has been proposed and developed. The model is based on thickness of boundary layer and film theory. The key parameter in the model is the distance between two adjacent particles which collide with the wall. According to the proposed model, the liquid convective heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase flow. Additionally, the wall-to-bed heat transfer coefficient has been measured experimentally in water–glass particles fluidized bed, for different particle sizes. Comparison of the model prediction with experimental data has shown that size of the particles strongly influences the mechanism of heat transfer. For fine particles of 0.8 mm in diameter, the liquid convective heat transfer model represents adequately the experimental data, indicating that particle convective mechanism is negligible. For coarse particles of 1.5–2 mm in diameter, the liquid convective heat transfer mechanism accounts for 60 % of the overall heat transfer coefficient.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Heat transfer by liquid convection in particulate fluidized beds
T1  - ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ
EP  - 924
IS  - 7-8
SP  - 911
VL  - 87
DO  - 10.2298/JSC211216020J
ER  - 

@article{
author = "Jaćimovski, Darko R. and Brzić, Danica V. and Garić-Grulović, Radmila V. and Pjanović, Rada V. and Đuriš, Mihal M. and Arsenijević, Zorana L.J. and Bošković-Vragolović, Nevenka M.",
year = "2022",
abstract = "In this work the theoretical model for heat transfer from a wall to a liquid-solid fluidized bed by liquid convective mechanism has been proposed and developed. The model is based on thickness of boundary layer and film theory. The key parameter in the model is the distance between two adjacent particles which collide with the wall. According to the proposed model, the liquid convective heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase flow. Additionally, the wall-to-bed heat transfer coefficient has been measured experimentally in water–glass particles fluidized bed, for different particle sizes. Comparison of the model prediction with experimental data has shown that size of the particles strongly influences the mechanism of heat transfer. For fine particles of 0.8 mm in diameter, the liquid convective heat transfer model represents adequately the experimental data, indicating that particle convective mechanism is negligible. For coarse particles of 1.5–2 mm in diameter, the liquid convective heat transfer mechanism accounts for 60 % of the overall heat transfer coefficient.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Heat transfer by liquid convection in particulate fluidized beds, ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ",
pages = "924-911",
number = "7-8",
volume = "87",
doi = "10.2298/JSC211216020J"
}

Jaćimovski, D. R., Brzić, D. V., Garić-Grulović, R. V., Pjanović, R. V., Đuriš, M. M., Arsenijević, Z. L.J.,& Bošković-Vragolović, N. M.. (2022). Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 87(7-8), 911-924.
https://doi.org/10.2298/JSC211216020J

Jaćimovski DR, Brzić DV, Garić-Grulović RV, Pjanović RV, Đuriš MM, Arsenijević ZL, Bošković-Vragolović NM. Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society. 2022;87(7-8):911-924.
doi:10.2298/JSC211216020J .

Jaćimovski, Darko R., Brzić, Danica V., Garić-Grulović, Radmila V., Pjanović, Rada V., Đuriš, Mihal M., Arsenijević, Zorana L.J., Bošković-Vragolović, Nevenka M., "Heat transfer by liquid convection in particulate fluidized beds" in Journal of the Serbian Chemical Society, 87, no. 7-8 (2022):911-924,
https://doi.org/10.2298/JSC211216020J . .

TY  - JOUR
AU  - Marković, Maja
AU  - Panić, Vesna
AU  - Šešlija, Sanja
AU  - Spasojević, Pavle
AU  - Ugrinović, Vukašin
AU  - Bošković-Vragolović, Nevenka
AU  - Pjanović, Rada
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4382
AB  - pH sensitive, nontoxic, and biocompatible poly(methacrylic) acid (PMAA) based soft networks have been extensively used in the design of systems for targeted drug delivery. Still, their highly hydrophilic nature limits their potential to be used as a carrier of poorly water-soluble substances. With the aim to overcome this limitation, the present study details a new approach for modification of PMAA based carriers using two amphiphilic components: casein and liposomes. The FTIR analysis revealed structural features of each component as well as the synergetic effect that originated from the formation of specific interactions. Namely, hydrophobic interactions between the poorly water-soluble model drug (caffeine) and casein enabled caffeine encapsulation and controlled release, while addition of liposomes ensured better control of the release rate. The morphological properties of the carriers, swelling behavior, and release kinetics of caffeine were investigated depending on the variable synthesis parameters (neutralization degree of methacrylic acid, concentration of caffeine, presence/absence of liposomes) in two different media simulating the pH environment of human intestines and stomach. The data obtained from in vitro caffeine release were correlated and analyzed in detail using several mathematical models, indicating significant potential of investigated carriers for targeted delivery and controlled release of poorly water-soluble substances.
PB  - Wiley, Hoboken
T2  - Polymer Engineering and Science
T1  - Modification of hydrophilic polymer network to design a carrier for a poorly water-soluble substance
EP  - 2510
IS  - 10
SP  - 2496
VL  - 60
DO  - 10.1002/pen.25487
ER  - 

@article{
author = "Marković, Maja and Panić, Vesna and Šešlija, Sanja and Spasojević, Pavle and Ugrinović, Vukašin and Bošković-Vragolović, Nevenka and Pjanović, Rada",
year = "2020",
abstract = "pH sensitive, nontoxic, and biocompatible poly(methacrylic) acid (PMAA) based soft networks have been extensively used in the design of systems for targeted drug delivery. Still, their highly hydrophilic nature limits their potential to be used as a carrier of poorly water-soluble substances. With the aim to overcome this limitation, the present study details a new approach for modification of PMAA based carriers using two amphiphilic components: casein and liposomes. The FTIR analysis revealed structural features of each component as well as the synergetic effect that originated from the formation of specific interactions. Namely, hydrophobic interactions between the poorly water-soluble model drug (caffeine) and casein enabled caffeine encapsulation and controlled release, while addition of liposomes ensured better control of the release rate. The morphological properties of the carriers, swelling behavior, and release kinetics of caffeine were investigated depending on the variable synthesis parameters (neutralization degree of methacrylic acid, concentration of caffeine, presence/absence of liposomes) in two different media simulating the pH environment of human intestines and stomach. The data obtained from in vitro caffeine release were correlated and analyzed in detail using several mathematical models, indicating significant potential of investigated carriers for targeted delivery and controlled release of poorly water-soluble substances.",
publisher = "Wiley, Hoboken",
journal = "Polymer Engineering and Science",
title = "Modification of hydrophilic polymer network to design a carrier for a poorly water-soluble substance",
pages = "2510-2496",
number = "10",
volume = "60",
doi = "10.1002/pen.25487"
}

Marković, M., Panić, V., Šešlija, S., Spasojević, P., Ugrinović, V., Bošković-Vragolović, N.,& Pjanović, R.. (2020). Modification of hydrophilic polymer network to design a carrier for a poorly water-soluble substance. in Polymer Engineering and Science
Wiley, Hoboken., 60(10), 2496-2510.
https://doi.org/10.1002/pen.25487

Marković M, Panić V, Šešlija S, Spasojević P, Ugrinović V, Bošković-Vragolović N, Pjanović R. Modification of hydrophilic polymer network to design a carrier for a poorly water-soluble substance. in Polymer Engineering and Science. 2020;60(10):2496-2510.
doi:10.1002/pen.25487 .

Marković, Maja, Panić, Vesna, Šešlija, Sanja, Spasojević, Pavle, Ugrinović, Vukašin, Bošković-Vragolović, Nevenka, Pjanović, Rada, "Modification of hydrophilic polymer network to design a carrier for a poorly water-soluble substance" in Polymer Engineering and Science, 60, no. 10 (2020):2496-2510,
https://doi.org/10.1002/pen.25487 . .

TY  - JOUR
AU  - Marković, Maja
AU  - Panić, Vesna
AU  - Šešlija, Sanja
AU  - Milivojević, Ana
AU  - Spasojević, Pavle
AU  - Bošković-Vragolović, Nevenka
AU  - Pjanović, Rada
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4541
AB  - Carriers for targeted delivery and controlled release of poorly water-soluble active substances (PWSAS) are facing three challenges: (a) the encapsulation issues, (b) limitations of PWSAS water solubility, and
PB  - Wiley, Hoboken
T2  - Polymer Engineering and Science
T1  - Novel strategy for encapsulation and targeted delivery of poorly water-soluble active substances
EP  - 2022
IS  - 8
SP  - 2008
VL  - 60
DO  - 10.1002/pen.25448
ER  - 

@article{
author = "Marković, Maja and Panić, Vesna and Šešlija, Sanja and Milivojević, Ana and Spasojević, Pavle and Bošković-Vragolović, Nevenka and Pjanović, Rada",
year = "2020",
abstract = "Carriers for targeted delivery and controlled release of poorly water-soluble active substances (PWSAS) are facing three challenges: (a) the encapsulation issues, (b) limitations of PWSAS water solubility, and",
publisher = "Wiley, Hoboken",
journal = "Polymer Engineering and Science",
title = "Novel strategy for encapsulation and targeted delivery of poorly water-soluble active substances",
pages = "2022-2008",
number = "8",
volume = "60",
doi = "10.1002/pen.25448"
}

Marković, M., Panić, V., Šešlija, S., Milivojević, A., Spasojević, P., Bošković-Vragolović, N.,& Pjanović, R.. (2020). Novel strategy for encapsulation and targeted delivery of poorly water-soluble active substances. in Polymer Engineering and Science
Wiley, Hoboken., 60(8), 2008-2022.
https://doi.org/10.1002/pen.25448

Marković M, Panić V, Šešlija S, Milivojević A, Spasojević P, Bošković-Vragolović N, Pjanović R. Novel strategy for encapsulation and targeted delivery of poorly water-soluble active substances. in Polymer Engineering and Science. 2020;60(8):2008-2022.
doi:10.1002/pen.25448 .

Marković, Maja, Panić, Vesna, Šešlija, Sanja, Milivojević, Ana, Spasojević, Pavle, Bošković-Vragolović, Nevenka, Pjanović, Rada, "Novel strategy for encapsulation and targeted delivery of poorly water-soluble active substances" in Polymer Engineering and Science, 60, no. 8 (2020):2008-2022,
https://doi.org/10.1002/pen.25448 . .

TY  - CONF
AU  - Marković, Maja
AU  - Panić, Vesna
AU  - Šešlija, Sanja
AU  - Spasojević, Pavle
AU  - Ugrinović, Vukašin
AU  - Bošković-Vragolović, Nevenka
AU  - Pjanović, Rada
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5075
AB  - Soft polymeric networks based on poly(methacrylic
acid) (PMAA) are attractive candidates for targeted and
controlled drug release due to their non-toxicity,
biocompatibility and pH-sensitivity. The highly hydrophilic
nature of PMAA networks enables transport of hydrophilic
drugs only. This limitation has been overcome in present work
by a PMAA modification with casein and liposomes. Casein is a
natural amphiphilic protein which enabled the encapsulation
and targeted and controlled release of the model drug- caffeine.
The FTIR spectra showed that the hydrophobic interactions and
hydrogen bonds were established between the casein and
caffeine. The caffeine in vitro release was monitored in two media
at 37C: phosphate buffer pH=6.8, which simulated the pH
environment in the human intestines and 0.1M HCl pH=1.2,
which simulated the pH environment in the human stomach. The
presence of liposomes with the encapsulated caffeine in the
carriers caused the decrease in the speed of caffeine release.
Introduction of itaconic acid (IA) as a hydrophilic and pHsensitive substance with two carboxylic groups resulted in a nonregular structure of the carriers with large voids which caused
an increase in swelling rate of the carriers and an increase in
speed of caffeine release. All obtained results showed that the
targeted and controlled release of a poorly water-soluble
substance was achieved.
PB  - ETRAN Society, Belgrade, Academic Mind, Belgrade
C3  - 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019
T1  - Soft polymeric networks based on poly(methacrylic acid), itaconic acid, casein and liposomes for targeted delivery and controlled release of poorly water soluble active substance
EP  - 670
SP  - 665
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5075
ER  - 

@conference{
author = "Marković, Maja and Panić, Vesna and Šešlija, Sanja and Spasojević, Pavle and Ugrinović, Vukašin and Bošković-Vragolović, Nevenka and Pjanović, Rada",
year = "2019",
abstract = "Soft polymeric networks based on poly(methacrylic
acid) (PMAA) are attractive candidates for targeted and
controlled drug release due to their non-toxicity,
biocompatibility and pH-sensitivity. The highly hydrophilic
nature of PMAA networks enables transport of hydrophilic
drugs only. This limitation has been overcome in present work
by a PMAA modification with casein and liposomes. Casein is a
natural amphiphilic protein which enabled the encapsulation
and targeted and controlled release of the model drug- caffeine.
The FTIR spectra showed that the hydrophobic interactions and
hydrogen bonds were established between the casein and
caffeine. The caffeine in vitro release was monitored in two media
at 37C: phosphate buffer pH=6.8, which simulated the pH
environment in the human intestines and 0.1M HCl pH=1.2,
which simulated the pH environment in the human stomach. The
presence of liposomes with the encapsulated caffeine in the
carriers caused the decrease in the speed of caffeine release.
Introduction of itaconic acid (IA) as a hydrophilic and pHsensitive substance with two carboxylic groups resulted in a nonregular structure of the carriers with large voids which caused
an increase in swelling rate of the carriers and an increase in
speed of caffeine release. All obtained results showed that the
targeted and controlled release of a poorly water-soluble
substance was achieved.",
publisher = "ETRAN Society, Belgrade, Academic Mind, Belgrade",
journal = "6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019",
title = "Soft polymeric networks based on poly(methacrylic acid), itaconic acid, casein and liposomes for targeted delivery and controlled release of poorly water soluble active substance",
pages = "670-665",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5075"
}

Marković, M., Panić, V., Šešlija, S., Spasojević, P., Ugrinović, V., Bošković-Vragolović, N.,& Pjanović, R.. (2019). Soft polymeric networks based on poly(methacrylic acid), itaconic acid, casein and liposomes for targeted delivery and controlled release of poorly water soluble active substance. in 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019
ETRAN Society, Belgrade, Academic Mind, Belgrade., 665-670.
https://hdl.handle.net/21.15107/rcub_technorep_5075

Marković M, Panić V, Šešlija S, Spasojević P, Ugrinović V, Bošković-Vragolović N, Pjanović R. Soft polymeric networks based on poly(methacrylic acid), itaconic acid, casein and liposomes for targeted delivery and controlled release of poorly water soluble active substance. in 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019. 2019;:665-670.
https://hdl.handle.net/21.15107/rcub_technorep_5075 .

Marković, Maja, Panić, Vesna, Šešlija, Sanja, Spasojević, Pavle, Ugrinović, Vukašin, Bošković-Vragolović, Nevenka, Pjanović, Rada, "Soft polymeric networks based on poly(methacrylic acid), itaconic acid, casein and liposomes for targeted delivery and controlled release of poorly water soluble active substance" in 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019 (2019):665-670,
https://hdl.handle.net/21.15107/rcub_technorep_5075 .

TY  - JOUR
AU  - Pravilović, Radoslava
AU  - Balanč, Bojana
AU  - Đorđević, Verica
AU  - Bošković-Vragolović, Nevenka
AU  - Bugarski, Branko
AU  - Pjanović, Rada
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4230
AB  - Thymus serpyllum L (thyme) aqueous extract was encapsulated within three different types of particles. Thus, electrostatic extrusion was applied to obtain alginate, alginate/chitosan, and alginate/inulin particles with encapsulated extract which is known as a rich source of polyphenolic compounds. The effect of admixed chitosan and inulin was evaluated from the point of polyphenols release by using Franz diffusion cell. The alginate/chitosan particles exhibited the effective diffusion coefficient of 1.94 center dot 10(-9) center dot m(2) s(-1) which was about 2.7 times lower in comparison to that of alginate/inulin particles and about 6.3 times lower than the effective diffusion coefficient of plain alginate particles. Swelling studies also confirmed decreased permeability of composite particles compared to plain alginate particles. In addition, according to the Korsmeyer-Peppas model, the composite particles exhibited anomalous diffusion of polyphenols controlled by molecular diffusion and polymer relaxation. Practical applications The calcium alginate particles are meant for delivery of biologically active compounds in foods with added value. Coating of alginate particles using chitosan has been investigated to control release of encapsulated biologically active compounds, but also as an improver of the particles structure.
PB  - Wiley, Hoboken
T2  - Journal of Food Process Engineering
T1  - Diffusion of polyphenols from alginate, alginate/chitosan, and alginate/inulin particles
IS  - 4
VL  - 42
DO  - 10.1111/jfpe.13043
ER  - 

@article{
author = "Pravilović, Radoslava and Balanč, Bojana and Đorđević, Verica and Bošković-Vragolović, Nevenka and Bugarski, Branko and Pjanović, Rada",
year = "2019",
abstract = "Thymus serpyllum L (thyme) aqueous extract was encapsulated within three different types of particles. Thus, electrostatic extrusion was applied to obtain alginate, alginate/chitosan, and alginate/inulin particles with encapsulated extract which is known as a rich source of polyphenolic compounds. The effect of admixed chitosan and inulin was evaluated from the point of polyphenols release by using Franz diffusion cell. The alginate/chitosan particles exhibited the effective diffusion coefficient of 1.94 center dot 10(-9) center dot m(2) s(-1) which was about 2.7 times lower in comparison to that of alginate/inulin particles and about 6.3 times lower than the effective diffusion coefficient of plain alginate particles. Swelling studies also confirmed decreased permeability of composite particles compared to plain alginate particles. In addition, according to the Korsmeyer-Peppas model, the composite particles exhibited anomalous diffusion of polyphenols controlled by molecular diffusion and polymer relaxation. Practical applications The calcium alginate particles are meant for delivery of biologically active compounds in foods with added value. Coating of alginate particles using chitosan has been investigated to control release of encapsulated biologically active compounds, but also as an improver of the particles structure.",
publisher = "Wiley, Hoboken",
journal = "Journal of Food Process Engineering",
title = "Diffusion of polyphenols from alginate, alginate/chitosan, and alginate/inulin particles",
number = "4",
volume = "42",
doi = "10.1111/jfpe.13043"
}

Pravilović, R., Balanč, B., Đorđević, V., Bošković-Vragolović, N., Bugarski, B.,& Pjanović, R.. (2019). Diffusion of polyphenols from alginate, alginate/chitosan, and alginate/inulin particles. in Journal of Food Process Engineering
Wiley, Hoboken., 42(4).
https://doi.org/10.1111/jfpe.13043

Pravilović R, Balanč B, Đorđević V, Bošković-Vragolović N, Bugarski B, Pjanović R. Diffusion of polyphenols from alginate, alginate/chitosan, and alginate/inulin particles. in Journal of Food Process Engineering. 2019;42(4).
doi:10.1111/jfpe.13043 .

Pravilović, Radoslava, Balanč, Bojana, Đorđević, Verica, Bošković-Vragolović, Nevenka, Bugarski, Branko, Pjanović, Rada, "Diffusion of polyphenols from alginate, alginate/chitosan, and alginate/inulin particles" in Journal of Food Process Engineering, 42, no. 4 (2019),
https://doi.org/10.1111/jfpe.13043 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Milojević, Svetomir
AU  - Bošković-Vragolović, Nevenka
AU  - Pavićević, Vladimir
AU  - Babincev, Ljiljana M.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4252
AB  - The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.
PB  - Chemical Industry Press, Beijing
T2  - Chinese Journal of Chemical Engineering
T1  - A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation
EP  - 612
IS  - 3
SP  - 605
VL  - 27
DO  - 10.1016/j.cjche.2018.06.022
ER  - 

@article{
author = "Marković, Miljana S. and Milojević, Svetomir and Bošković-Vragolović, Nevenka and Pavićević, Vladimir and Babincev, Ljiljana M. and Veljković, Vlada B.",
year = "2019",
abstract = "The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.",
publisher = "Chemical Industry Press, Beijing",
journal = "Chinese Journal of Chemical Engineering",
title = "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation",
pages = "612-605",
number = "3",
volume = "27",
doi = "10.1016/j.cjche.2018.06.022"
}

Marković, M. S., Milojević, S., Bošković-Vragolović, N., Pavićević, V., Babincev, L. M.,& Veljković, V. B.. (2019). A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering
Chemical Industry Press, Beijing., 27(3), 605-612.
https://doi.org/10.1016/j.cjche.2018.06.022

Marković MS, Milojević S, Bošković-Vragolović N, Pavićević V, Babincev LM, Veljković VB. A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering. 2019;27(3):605-612.
doi:10.1016/j.cjche.2018.06.022 .

Marković, Miljana S., Milojević, Svetomir, Bošković-Vragolović, Nevenka, Pavićević, Vladimir, Babincev, Ljiljana M., Veljković, Vlada B., "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation" in Chinese Journal of Chemical Engineering, 27, no. 3 (2019):605-612,
https://doi.org/10.1016/j.cjche.2018.06.022 . .

TY  - JOUR
AU  - Zdravković, Jasmina M.
AU  - Pavlović, N.V.
AU  - Mladenović, J.D.
AU  - Bošković-Vragolović, Nevenka
AU  - Zdravković, N.M.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4326
AB  - The degradation of carotenoids (lycopene and β-carotene) and total antioxidant activity was investigated after one- year storage of pasteurized tomato juice. Tomato juice, thermally treated for 7 min at 100°C, was subjected to one-year storage a) in the light at 20°C; b) in the dark at 20°C and c) in the dark at 4°C. β-Carotene had the fastest dynamics of degradation and was dissolved in the largest quantities, regardless of the storage conditions. For all investigated components the fastest decomposition was observed in the first two months, when the sample was stored in the light at 20°C. Lycopene was most stable in the sample stored in the dark at 40C. Partial regression coefficients for all researched traits proved a significant difference of ratio for storing in the light (20°C) compared to the variants stored in the dark at 20°C and 4°C, lycopene p=0.0041**, p=0.0304**; β-carotene, p=0.0009** and p=0.0183**; antioxidative activity p lt 0.0001** and p=0.009**.
T2  - Bulgarian Chemical Communications
T1  - Effects of tomato processing on carotenoids antioxidant activity and stability during one-year storage
EP  - 610
IS  - 4
SP  - 604
VL  - 51
DO  - 10.34049/bcc.51.4.5126
ER  - 

@article{
author = "Zdravković, Jasmina M. and Pavlović, N.V. and Mladenović, J.D. and Bošković-Vragolović, Nevenka and Zdravković, N.M.",
year = "2019",
abstract = "The degradation of carotenoids (lycopene and β-carotene) and total antioxidant activity was investigated after one- year storage of pasteurized tomato juice. Tomato juice, thermally treated for 7 min at 100°C, was subjected to one-year storage a) in the light at 20°C; b) in the dark at 20°C and c) in the dark at 4°C. β-Carotene had the fastest dynamics of degradation and was dissolved in the largest quantities, regardless of the storage conditions. For all investigated components the fastest decomposition was observed in the first two months, when the sample was stored in the light at 20°C. Lycopene was most stable in the sample stored in the dark at 40C. Partial regression coefficients for all researched traits proved a significant difference of ratio for storing in the light (20°C) compared to the variants stored in the dark at 20°C and 4°C, lycopene p=0.0041**, p=0.0304**; β-carotene, p=0.0009** and p=0.0183**; antioxidative activity p lt 0.0001** and p=0.009**.",
journal = "Bulgarian Chemical Communications",
title = "Effects of tomato processing on carotenoids antioxidant activity and stability during one-year storage",
pages = "610-604",
number = "4",
volume = "51",
doi = "10.34049/bcc.51.4.5126"
}

Zdravković, J. M., Pavlović, N.V., Mladenović, J.D., Bošković-Vragolović, N.,& Zdravković, N.M.. (2019). Effects of tomato processing on carotenoids antioxidant activity and stability during one-year storage. in Bulgarian Chemical Communications, 51(4), 604-610.
https://doi.org/10.34049/bcc.51.4.5126

Zdravković JM, Pavlović N, Mladenović J, Bošković-Vragolović N, Zdravković N. Effects of tomato processing on carotenoids antioxidant activity and stability during one-year storage. in Bulgarian Chemical Communications. 2019;51(4):604-610.
doi:10.34049/bcc.51.4.5126 .

Zdravković, Jasmina M., Pavlović, N.V., Mladenović, J.D., Bošković-Vragolović, Nevenka, Zdravković, N.M., "Effects of tomato processing on carotenoids antioxidant activity and stability during one-year storage" in Bulgarian Chemical Communications, 51, no. 4 (2019):604-610,
https://doi.org/10.34049/bcc.51.4.5126 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Milojević, Svetomir Ž.
AU  - Bošković-Vragolović, Nevenka
AU  - Pavićević, Vladimir P.
AU  - Babincev, Ljiljana М.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5031
AB  - The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.
PB  - Chemical Industry Press
T2  - Chinese Journal of Chemical Engineering
T1  - A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation
EP  - 612
IS  - 3
SP  - 605
VL  - 27
DO  - 10.1016/j.cjche.2018.06.022
ER  - 

@article{
author = "Marković, Miljana S. and Milojević, Svetomir Ž. and Bošković-Vragolović, Nevenka and Pavićević, Vladimir P. and Babincev, Ljiljana М. and Veljković, Vlada B.",
year = "2019",
abstract = "The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.",
publisher = "Chemical Industry Press",
journal = "Chinese Journal of Chemical Engineering",
title = "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation",
pages = "612-605",
number = "3",
volume = "27",
doi = "10.1016/j.cjche.2018.06.022"
}

Marković, M. S., Milojević, S. Ž., Bošković-Vragolović, N., Pavićević, V. P., Babincev, L. М.,& Veljković, V. B.. (2019). A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering
Chemical Industry Press., 27(3), 605-612.
https://doi.org/10.1016/j.cjche.2018.06.022

Marković MS, Milojević SŽ, Bošković-Vragolović N, Pavićević VP, Babincev LМ, Veljković VB. A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering. 2019;27(3):605-612.
doi:10.1016/j.cjche.2018.06.022 .

Marković, Miljana S., Milojević, Svetomir Ž., Bošković-Vragolović, Nevenka, Pavićević, Vladimir P., Babincev, Ljiljana М., Veljković, Vlada B., "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation" in Chinese Journal of Chemical Engineering, 27, no. 3 (2019):605-612,
https://doi.org/10.1016/j.cjche.2018.06.022 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Radosavljević, Dragana B.
AU  - Pavićević, Vladimir
AU  - Ristić, Mihailo S.
AU  - Milojević, Svetomir
AU  - Bošković-Vragolović, Nevenka
AU  - Veljković, Vlada B.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3845
AB  - The present paper dealt with the influence of the common juniper berries pretreatment on the yield, chemical composition and extraction kinetics of juniper essential oil (JEO) obtained by classical (HD) and microwave assisted hydrodistillation (MAHD). The highest JEO yield was obtained by HD from one-minute dry-ground juniper berries (2.23 +/- 0.00 g/100 g). No statistically significant influence of swelling and distillation technique on JEO yield was observed. Therefore, the optimal pretreatment process involved no swelling and one-minute grinding. However, no significant difference in the chemical composition of the JEOs obtained by the two techniques was observed. A new phenomenological kinetic model was developed on the basis of the mechanism of JEO extraction by both HD MAHD, which assumed three simultaneously-occurring stages: washing, unhindered diffusion and hindered diffusion. The main advantage of developed model was its ability to describe the variations of JEO yield and distillation rates with time. Furthermore, it had the smallest mean relative percentage deviation compared to the well-known kinetics models and the parameters that all were statistically significant, so it was recommended for modeling the kinetics of JEO extraction by HD and especially MAHD.
PB  - Elsevier Science Bv, Amsterdam
T2  - Industrial Crops and Products
T1  - Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation
EP  - 413
SP  - 402
VL  - 122
DO  - 10.1016/j.indcrop.2018.06.018
ER  - 

@article{
author = "Marković, Miljana S. and Radosavljević, Dragana B. and Pavićević, Vladimir and Ristić, Mihailo S. and Milojević, Svetomir and Bošković-Vragolović, Nevenka and Veljković, Vlada B.",
year = "2018",
abstract = "The present paper dealt with the influence of the common juniper berries pretreatment on the yield, chemical composition and extraction kinetics of juniper essential oil (JEO) obtained by classical (HD) and microwave assisted hydrodistillation (MAHD). The highest JEO yield was obtained by HD from one-minute dry-ground juniper berries (2.23 +/- 0.00 g/100 g). No statistically significant influence of swelling and distillation technique on JEO yield was observed. Therefore, the optimal pretreatment process involved no swelling and one-minute grinding. However, no significant difference in the chemical composition of the JEOs obtained by the two techniques was observed. A new phenomenological kinetic model was developed on the basis of the mechanism of JEO extraction by both HD MAHD, which assumed three simultaneously-occurring stages: washing, unhindered diffusion and hindered diffusion. The main advantage of developed model was its ability to describe the variations of JEO yield and distillation rates with time. Furthermore, it had the smallest mean relative percentage deviation compared to the well-known kinetics models and the parameters that all were statistically significant, so it was recommended for modeling the kinetics of JEO extraction by HD and especially MAHD.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Industrial Crops and Products",
title = "Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation",
pages = "413-402",
volume = "122",
doi = "10.1016/j.indcrop.2018.06.018"
}

Marković, M. S., Radosavljević, D. B., Pavićević, V., Ristić, M. S., Milojević, S., Bošković-Vragolović, N.,& Veljković, V. B.. (2018). Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation. in Industrial Crops and Products
Elsevier Science Bv, Amsterdam., 122, 402-413.
https://doi.org/10.1016/j.indcrop.2018.06.018

Marković MS, Radosavljević DB, Pavićević V, Ristić MS, Milojević S, Bošković-Vragolović N, Veljković VB. Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation. in Industrial Crops and Products. 2018;122:402-413.
doi:10.1016/j.indcrop.2018.06.018 .

Marković, Miljana S., Radosavljević, Dragana B., Pavićević, Vladimir, Ristić, Mihailo S., Milojević, Svetomir, Bošković-Vragolović, Nevenka, Veljković, Vlada B., "Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation" in Industrial Crops and Products, 122 (2018):402-413,
https://doi.org/10.1016/j.indcrop.2018.06.018 . .

TY  - JOUR
AU  - Đeković-Šević, Milica
AU  - Bošković-Vragolović, Nevenka
AU  - Garić-Grulović, Radmila
AU  - Pejanović, Srđan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3967
AB  - This work deals with gas absorption accompanied by chemical reaction in a liquid phase. Ozone absorption in potassium indigotrisulfonate solution was investigated in a batch bubble column. Enhancement factor for absorption accompanied by instantaneous chemical reaction in the liquid phase was experimentally determined, as a ratio of the volumetric mass transfer coefficient for the absorption accompanied by reaction to that for pure physical absorption. The influence of (a) the initial concentration of the solute from liquid phase and (b) the ozone concentration in gas phase on the enhancement factor were experimentally examined. The absorption accompanied by instantaneous chemical reaction is a diffusion-controlled process, whose rate depends upon the diffusivities of the absorbing gas and the solute in liquid phase. The influence of these diffusivities was found to be more significant for lower values of the enhancement factor. The rate of ozone absorption was followed by the time change of the solution color, using new method based on the computer program SigmaScan Pro 5 (Systat Software, Inc., San Jose, CA, USA). This investigation is a contribution to the prediction of the ozone consumption in wastewater treatment, in cases when ozone instantaneously reacts with substances present in water.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Chemical Engineering Communications
T1  - Experimental study on the ozone absorption accompanied by instantaneous chemical reaction
EP  - 580
IS  - 5
SP  - 571
VL  - 205
DO  - 10.1080/00986445.2017.1399125
ER  - 

@article{
author = "Đeković-Šević, Milica and Bošković-Vragolović, Nevenka and Garić-Grulović, Radmila and Pejanović, Srđan",
year = "2018",
abstract = "This work deals with gas absorption accompanied by chemical reaction in a liquid phase. Ozone absorption in potassium indigotrisulfonate solution was investigated in a batch bubble column. Enhancement factor for absorption accompanied by instantaneous chemical reaction in the liquid phase was experimentally determined, as a ratio of the volumetric mass transfer coefficient for the absorption accompanied by reaction to that for pure physical absorption. The influence of (a) the initial concentration of the solute from liquid phase and (b) the ozone concentration in gas phase on the enhancement factor were experimentally examined. The absorption accompanied by instantaneous chemical reaction is a diffusion-controlled process, whose rate depends upon the diffusivities of the absorbing gas and the solute in liquid phase. The influence of these diffusivities was found to be more significant for lower values of the enhancement factor. The rate of ozone absorption was followed by the time change of the solution color, using new method based on the computer program SigmaScan Pro 5 (Systat Software, Inc., San Jose, CA, USA). This investigation is a contribution to the prediction of the ozone consumption in wastewater treatment, in cases when ozone instantaneously reacts with substances present in water.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Chemical Engineering Communications",
title = "Experimental study on the ozone absorption accompanied by instantaneous chemical reaction",
pages = "580-571",
number = "5",
volume = "205",
doi = "10.1080/00986445.2017.1399125"
}

Đeković-Šević, M., Bošković-Vragolović, N., Garić-Grulović, R.,& Pejanović, S.. (2018). Experimental study on the ozone absorption accompanied by instantaneous chemical reaction. in Chemical Engineering Communications
Taylor & Francis Inc, Philadelphia., 205(5), 571-580.
https://doi.org/10.1080/00986445.2017.1399125

Đeković-Šević M, Bošković-Vragolović N, Garić-Grulović R, Pejanović S. Experimental study on the ozone absorption accompanied by instantaneous chemical reaction. in Chemical Engineering Communications. 2018;205(5):571-580.
doi:10.1080/00986445.2017.1399125 .

Đeković-Šević, Milica, Bošković-Vragolović, Nevenka, Garić-Grulović, Radmila, Pejanović, Srđan, "Experimental study on the ozone absorption accompanied by instantaneous chemical reaction" in Chemical Engineering Communications, 205, no. 5 (2018):571-580,
https://doi.org/10.1080/00986445.2017.1399125 . .

TY  - JOUR
AU  - Zdravković, Jasmina M.
AU  - Pavlović, Nenad V.
AU  - Bošković-Vragolović, Nevenka
AU  - Moravčević, Đorđe Ž.
AU  - Šević, Milan M.
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3518
AB  - The aim of this study was to find an optimal way of tomato drying in a tunnel type dryer, in order to achieve the lowest possible losses in nutritive value of dried tomato products. Domestic variety of tomato (SP-109) was used in this research. Drying was performed in three ways, applying five temperature regimes, as follows: cocurrent system (variant 1 at 70-80 oC; variant 2 at 90-75 oC), countercurrent system (variant 1 at 55-65 oC, variant 2 at 65-75 oC) and combined system (85-55 oC and 55-65 oC). In these systems, the kinetic of changes in nutritive value of tomato fruits was monitored by measuring the content of carbohydrates, lycopene and vitamin C. Different influences of temperature regimes on nutritive value of dried tomato were observed at the level of statistical difference (LSD 0.05; 0.01) in the researched systems. Cocurrent system was statistically significant for differences in temperature modes (variant 1 and variant 2). Monitoring of the tomato drying kinetics showed that, in all variants, period of constant drying rate lasted about 3.5 h and that the total drying was the fastest in parallel cocurrent flow of non-saturated hot air and material. The content of total carbohydrates in tomato was dependent on the temperature regime of the tested drying systems. The carbohydrate content obtained in tomato samples dried at lower temperatures was higher compared to the values observed in the samples dried at higher drying temperatures. Significant losses of vitamin C were determined in all drying systems. The lycopene content under all experimental conditions generally showed a tendency to decrease slightly. Comparing its content in dry and fresh tomato fruits, the loss ranged from 4.94% to 19.98% but did not reach the significant level as the occurrence remained below 95% of cases.
AB  - Cilj ove studije bio je pronalaženje optimalnog načina sušenja paradajza u tunelskom tipu sušara kako bi se smanjili gubici vrednosti nutritijenata kod sušenog proizvoda paradajza. U ovom istraživanju korišćena je domaća sorta paradajza (SP-109). Istraživanje je izvedeno u tunelskom tipu sušara na tri načina u pet temperaturnih režima. Sušenje je izvedeno u sistemu paralelnog (varijanta 1 na 70-80 oC, varijanta 2 na 90-75 oC), suprotnosmernom (varijanta 1 na 55-65 oC, varijanta 2 na 65-75 oC) i kombinovanog sistema strujanja vazduha (85-55 oC i 55- 65 oC). U ovim sistemima sušenja praćena je kinetika promena nutritivnih vrednosti ploda paradajza: sadržaj ugljenih hidrata (%), likopena i askorbinske kiseline (vitamin C). Utvrđeni su različiti uticaji temperaturnih režima na nivou statističke razlike (LSD 0.05; 0.01) ispitivanih sistema za nutritivnu vrednost sušenog paradajza. Paralelni sistem je bio statistički značajan za razlike u varijanti temperature 1 i varijanti 2. Prateći kinetiku sušenja paradajza utvrđeno je da u svim varijantama period konstantnog sušenja traje oko 3,5 časa i da je za ukupno sušenje najbrži paralelni protok toplog vazduha i materijala. Sadržaj ugljenih hidrata u uzorcima paradajza koji su sušeni na nižim temperaturama bio je veći u poređenju sa sadržajem ugljenih hidrata koji je utvpđen u uzorcima osušenim na višim temperaturama sušenja. Na nižim temperaturama njihov sadržaj je bio veći nego kod viših temperatura sušenja. Značajni gubici vitamina C određeni su u svim sistemima sušenja. Vrednost likopena u svim eksperimentalnim uslovima sušenja pokazuje tendenciju blagog smanjenja. Poredeći sadržaj u suvim i svežim plodovima paradajza, gubitak je bio od 4,94% do 19,98%, ali ne na značajnom nivou.
PB  - Institute for Food Technology, Novi Sad
T2  - Food and Feed Research
T1  - Preservation of vitamin C, lycopene and carbohydrate content in tomato dried in a tunnel type dryer
T1  - Očuvanje vitamina C, likopena i ugljenih hidrata u plodovima paradajza sušenim u tunelskom tipu sušara
EP  - 142
IS  - 2
SP  - 133
VL  - 44
DO  - 10.5937/FFR1702133Z
ER  - 

@article{
author = "Zdravković, Jasmina M. and Pavlović, Nenad V. and Bošković-Vragolović, Nevenka and Moravčević, Đorđe Ž. and Šević, Milan M.",
year = "2017",
abstract = "The aim of this study was to find an optimal way of tomato drying in a tunnel type dryer, in order to achieve the lowest possible losses in nutritive value of dried tomato products. Domestic variety of tomato (SP-109) was used in this research. Drying was performed in three ways, applying five temperature regimes, as follows: cocurrent system (variant 1 at 70-80 oC; variant 2 at 90-75 oC), countercurrent system (variant 1 at 55-65 oC, variant 2 at 65-75 oC) and combined system (85-55 oC and 55-65 oC). In these systems, the kinetic of changes in nutritive value of tomato fruits was monitored by measuring the content of carbohydrates, lycopene and vitamin C. Different influences of temperature regimes on nutritive value of dried tomato were observed at the level of statistical difference (LSD 0.05; 0.01) in the researched systems. Cocurrent system was statistically significant for differences in temperature modes (variant 1 and variant 2). Monitoring of the tomato drying kinetics showed that, in all variants, period of constant drying rate lasted about 3.5 h and that the total drying was the fastest in parallel cocurrent flow of non-saturated hot air and material. The content of total carbohydrates in tomato was dependent on the temperature regime of the tested drying systems. The carbohydrate content obtained in tomato samples dried at lower temperatures was higher compared to the values observed in the samples dried at higher drying temperatures. Significant losses of vitamin C were determined in all drying systems. The lycopene content under all experimental conditions generally showed a tendency to decrease slightly. Comparing its content in dry and fresh tomato fruits, the loss ranged from 4.94% to 19.98% but did not reach the significant level as the occurrence remained below 95% of cases., Cilj ove studije bio je pronalaženje optimalnog načina sušenja paradajza u tunelskom tipu sušara kako bi se smanjili gubici vrednosti nutritijenata kod sušenog proizvoda paradajza. U ovom istraživanju korišćena je domaća sorta paradajza (SP-109). Istraživanje je izvedeno u tunelskom tipu sušara na tri načina u pet temperaturnih režima. Sušenje je izvedeno u sistemu paralelnog (varijanta 1 na 70-80 oC, varijanta 2 na 90-75 oC), suprotnosmernom (varijanta 1 na 55-65 oC, varijanta 2 na 65-75 oC) i kombinovanog sistema strujanja vazduha (85-55 oC i 55- 65 oC). U ovim sistemima sušenja praćena je kinetika promena nutritivnih vrednosti ploda paradajza: sadržaj ugljenih hidrata (%), likopena i askorbinske kiseline (vitamin C). Utvrđeni su različiti uticaji temperaturnih režima na nivou statističke razlike (LSD 0.05; 0.01) ispitivanih sistema za nutritivnu vrednost sušenog paradajza. Paralelni sistem je bio statistički značajan za razlike u varijanti temperature 1 i varijanti 2. Prateći kinetiku sušenja paradajza utvrđeno je da u svim varijantama period konstantnog sušenja traje oko 3,5 časa i da je za ukupno sušenje najbrži paralelni protok toplog vazduha i materijala. Sadržaj ugljenih hidrata u uzorcima paradajza koji su sušeni na nižim temperaturama bio je veći u poređenju sa sadržajem ugljenih hidrata koji je utvpđen u uzorcima osušenim na višim temperaturama sušenja. Na nižim temperaturama njihov sadržaj je bio veći nego kod viših temperatura sušenja. Značajni gubici vitamina C određeni su u svim sistemima sušenja. Vrednost likopena u svim eksperimentalnim uslovima sušenja pokazuje tendenciju blagog smanjenja. Poredeći sadržaj u suvim i svežim plodovima paradajza, gubitak je bio od 4,94% do 19,98%, ali ne na značajnom nivou.",
publisher = "Institute for Food Technology, Novi Sad",
journal = "Food and Feed Research",
title = "Preservation of vitamin C, lycopene and carbohydrate content in tomato dried in a tunnel type dryer, Očuvanje vitamina C, likopena i ugljenih hidrata u plodovima paradajza sušenim u tunelskom tipu sušara",
pages = "142-133",
number = "2",
volume = "44",
doi = "10.5937/FFR1702133Z"
}

Zdravković, J. M., Pavlović, N. V., Bošković-Vragolović, N., Moravčević, Đ. Ž.,& Šević, M. M.. (2017). Preservation of vitamin C, lycopene and carbohydrate content in tomato dried in a tunnel type dryer. in Food and Feed Research
Institute for Food Technology, Novi Sad., 44(2), 133-142.
https://doi.org/10.5937/FFR1702133Z

Zdravković JM, Pavlović NV, Bošković-Vragolović N, Moravčević ĐŽ, Šević MM. Preservation of vitamin C, lycopene and carbohydrate content in tomato dried in a tunnel type dryer. in Food and Feed Research. 2017;44(2):133-142.
doi:10.5937/FFR1702133Z .

Zdravković, Jasmina M., Pavlović, Nenad V., Bošković-Vragolović, Nevenka, Moravčević, Đorđe Ž., Šević, Milan M., "Preservation of vitamin C, lycopene and carbohydrate content in tomato dried in a tunnel type dryer" in Food and Feed Research, 44, no. 2 (2017):133-142,
https://doi.org/10.5937/FFR1702133Z . .

TY  - JOUR
AU  - Pravilović, Radoslava
AU  - Balanč, Bojana
AU  - Trifković, Kata T.
AU  - Đorđević, Verica
AU  - Bošković-Vragolović, Nevenka
AU  - Bugarski, Branko
AU  - Pjanović, Rada
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3638
AB  - Liposomes are known as convenient carriers for a broad range of actives. The release rate of actives can be adjusted/controlled by the addition of different surfactants. The aim of this study was to compare the effects of two surfactants, Span 20 and Span 40, on liposomes release properties. In particular, the study shows how the membrane modification affects the mass transfer resistances and liposome size compared with the common liposomes. The aqueous extract of thyme was used as a model substance. It is a valuable source of natural antioxidants - polyphenols. The diffusion of polyphenols from native thyme extract (un-encapsulated) and from different types of liposomes was conducted using Franz diffusion cell. The results were approximated with Fick's second law and they implied that liposomes modified with Span 20 provided the slowest release of polyphenolic compounds due to the highest value of mass transfer resistance (2.523 x 10(6) s/m).
PB  - Walter de Gruyter Gmbh, Berlin
T2  - International Journal of Food Engineering
T1  - Comparative Effects of Span 20 and Span 40 on Liposomes Release Properties
IS  - 12
VL  - 13
DO  - 10.1515/ijfe-2017-0339
ER  - 

@article{
author = "Pravilović, Radoslava and Balanč, Bojana and Trifković, Kata T. and Đorđević, Verica and Bošković-Vragolović, Nevenka and Bugarski, Branko and Pjanović, Rada",
year = "2017",
abstract = "Liposomes are known as convenient carriers for a broad range of actives. The release rate of actives can be adjusted/controlled by the addition of different surfactants. The aim of this study was to compare the effects of two surfactants, Span 20 and Span 40, on liposomes release properties. In particular, the study shows how the membrane modification affects the mass transfer resistances and liposome size compared with the common liposomes. The aqueous extract of thyme was used as a model substance. It is a valuable source of natural antioxidants - polyphenols. The diffusion of polyphenols from native thyme extract (un-encapsulated) and from different types of liposomes was conducted using Franz diffusion cell. The results were approximated with Fick's second law and they implied that liposomes modified with Span 20 provided the slowest release of polyphenolic compounds due to the highest value of mass transfer resistance (2.523 x 10(6) s/m).",
publisher = "Walter de Gruyter Gmbh, Berlin",
journal = "International Journal of Food Engineering",
title = "Comparative Effects of Span 20 and Span 40 on Liposomes Release Properties",
number = "12",
volume = "13",
doi = "10.1515/ijfe-2017-0339"
}

Pravilović, R., Balanč, B., Trifković, K. T., Đorđević, V., Bošković-Vragolović, N., Bugarski, B.,& Pjanović, R.. (2017). Comparative Effects of Span 20 and Span 40 on Liposomes Release Properties. in International Journal of Food Engineering
Walter de Gruyter Gmbh, Berlin., 13(12).
https://doi.org/10.1515/ijfe-2017-0339

Pravilović R, Balanč B, Trifković KT, Đorđević V, Bošković-Vragolović N, Bugarski B, Pjanović R. Comparative Effects of Span 20 and Span 40 on Liposomes Release Properties. in International Journal of Food Engineering. 2017;13(12).
doi:10.1515/ijfe-2017-0339 .

Pravilović, Radoslava, Balanč, Bojana, Trifković, Kata T., Đorđević, Verica, Bošković-Vragolović, Nevenka, Bugarski, Branko, Pjanović, Rada, "Comparative Effects of Span 20 and Span 40 on Liposomes Release Properties" in International Journal of Food Engineering, 13, no. 12 (2017),
https://doi.org/10.1515/ijfe-2017-0339 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Bošković-Vragolović, Nevenka
AU  - Ristić, Mihailo S.
AU  - Pavićević, Vladimir
AU  - Veljković, Vlada B.
AU  - Milojević, Svetomir
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3646
AB  - This paper deals with fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation (HD) and simultaneous hydrodistillation and rectification (SHDR) at atmospheric pressure. A rectification column was filled with the NORMAG packing A type and had 36 theoretical stages. In the present study, higher essential oil yield was obtained by HD (1.34 mass %) than by SHDR (1.17 mass %). However, mass fraction distributions of monoterpene hydrocarbons (MHs), oxygenated monoterpenes (OMs) and sesquiterpene hydrocarbons (SHs), observed for the two separation methods, differed from each other. In the SHDR process increased contents of high volatile components (predominantly MHs) were obtained in the initial fractions as well as increased contents of low volatile components (dominantly SHs) in the last fractions. Also, this method increased the separation degree of OMs.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification
EP  - 477
IS  - 6
SP  - 471
VL  - 71
DO  - 10.2298/HEMIND161204009M
ER  - 

@article{
author = "Marković, Miljana S. and Bošković-Vragolović, Nevenka and Ristić, Mihailo S. and Pavićević, Vladimir and Veljković, Vlada B. and Milojević, Svetomir",
year = "2017",
abstract = "This paper deals with fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation (HD) and simultaneous hydrodistillation and rectification (SHDR) at atmospheric pressure. A rectification column was filled with the NORMAG packing A type and had 36 theoretical stages. In the present study, higher essential oil yield was obtained by HD (1.34 mass %) than by SHDR (1.17 mass %). However, mass fraction distributions of monoterpene hydrocarbons (MHs), oxygenated monoterpenes (OMs) and sesquiterpene hydrocarbons (SHs), observed for the two separation methods, differed from each other. In the SHDR process increased contents of high volatile components (predominantly MHs) were obtained in the initial fractions as well as increased contents of low volatile components (dominantly SHs) in the last fractions. Also, this method increased the separation degree of OMs.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification",
pages = "477-471",
number = "6",
volume = "71",
doi = "10.2298/HEMIND161204009M"
}

Marković, M. S., Bošković-Vragolović, N., Ristić, M. S., Pavićević, V., Veljković, V. B.,& Milojević, S.. (2017). Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 71(6), 471-477.
https://doi.org/10.2298/HEMIND161204009M

Marković MS, Bošković-Vragolović N, Ristić MS, Pavićević V, Veljković VB, Milojević S. Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification. in Hemijska industrija. 2017;71(6):471-477.
doi:10.2298/HEMIND161204009M .

Marković, Miljana S., Bošković-Vragolović, Nevenka, Ristić, Mihailo S., Pavićević, Vladimir, Veljković, Vlada B., Milojević, Svetomir, "Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification" in Hemijska industrija, 71, no. 6 (2017):471-477,
https://doi.org/10.2298/HEMIND161204009M . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Garić-Grulović, Radmila
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3713
AB  - The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Friction factor for water flow through packed beds of spherical and non-spherical particles
EP  - 66
IS  - 1
SP  - 57
VL  - 23
DO  - 10.2298/CICEQ150506006K
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Garić-Grulović, Radmila and Đuriš, Mihal and Grbavčić, Željko",
year = "2017",
abstract = "The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Friction factor for water flow through packed beds of spherical and non-spherical particles",
pages = "66-57",
number = "1",
volume = "23",
doi = "10.2298/CICEQ150506006K"
}

Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Garić-Grulović, R., Đuriš, M.,& Grbavčić, Ž.. (2017). Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 23(1), 57-66.
https://doi.org/10.2298/CICEQ150506006K

Kaluđerović-Radoičić T, Bošković-Vragolović N, Garić-Grulović R, Đuriš M, Grbavčić Ž. Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry & Chemical Engineering Quarterly. 2017;23(1):57-66.
doi:10.2298/CICEQ150506006K .

Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Garić-Grulović, Radmila, Đuriš, Mihal, Grbavčić, Željko, "Friction factor for water flow through packed beds of spherical and non-spherical particles" in Chemical Industry & Chemical Engineering Quarterly, 23, no. 1 (2017):57-66,
https://doi.org/10.2298/CICEQ150506006K . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Garić-Grulović, Radmila
AU  - Vucetić, Nemanja
AU  - Pjanović, Rada
AU  - Bošković-Vragolović, Nevenka
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3337
AB  - The aim of this study was to analyze the concentration boundary layer for a comprehensive description of the mass transfer in systems with fluidized particles. Mass transfer from the wall of the column to the fluid in the presence of inert fluidized particles was experimentally investigated using the dissolution method. Experiments were carried out in a column 34 mm in diameter, divided by height into six segments. In all runs, mass transfer rates were determined in the presence of fluidized spherical glass particles 1.10 mm, 1.94 mm and 2.98 mm in diameter, using water as the fluidized medium. The analysis of the boundary layer shows the effect of particles presence on mass transfer in fluidized systems. The theoretical model was established based on boundary layer theory, and the impact of particles on the shortening of the boundary layer length, due to their collision with the wall of the column. The theoretically derived model was compared with experimentally obtained data and with data calculated from available literature correlations. Very good agreement was found between the model, experimental data, and published correlations (especially the correlation by Pickett et al. 12]).
PB  - Elsevier Science Bv, Amsterdam
T2  - Powder Technology
T1  - Mass transfer and concentration boundary layer in a particulate fluidized bed
EP  - 75
SP  - 68
VL  - 303
DO  - 10.1016/j.powtec.2016.09.025
ER  - 

@article{
author = "Jaćimovski, Darko and Garić-Grulović, Radmila and Vucetić, Nemanja and Pjanović, Rada and Bošković-Vragolović, Nevenka",
year = "2016",
abstract = "The aim of this study was to analyze the concentration boundary layer for a comprehensive description of the mass transfer in systems with fluidized particles. Mass transfer from the wall of the column to the fluid in the presence of inert fluidized particles was experimentally investigated using the dissolution method. Experiments were carried out in a column 34 mm in diameter, divided by height into six segments. In all runs, mass transfer rates were determined in the presence of fluidized spherical glass particles 1.10 mm, 1.94 mm and 2.98 mm in diameter, using water as the fluidized medium. The analysis of the boundary layer shows the effect of particles presence on mass transfer in fluidized systems. The theoretical model was established based on boundary layer theory, and the impact of particles on the shortening of the boundary layer length, due to their collision with the wall of the column. The theoretically derived model was compared with experimentally obtained data and with data calculated from available literature correlations. Very good agreement was found between the model, experimental data, and published correlations (especially the correlation by Pickett et al. 12]).",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Powder Technology",
title = "Mass transfer and concentration boundary layer in a particulate fluidized bed",
pages = "75-68",
volume = "303",
doi = "10.1016/j.powtec.2016.09.025"
}

Jaćimovski, D., Garić-Grulović, R., Vucetić, N., Pjanović, R.,& Bošković-Vragolović, N.. (2016). Mass transfer and concentration boundary layer in a particulate fluidized bed. in Powder Technology
Elsevier Science Bv, Amsterdam., 303, 68-75.
https://doi.org/10.1016/j.powtec.2016.09.025

Jaćimovski D, Garić-Grulović R, Vucetić N, Pjanović R, Bošković-Vragolović N. Mass transfer and concentration boundary layer in a particulate fluidized bed. in Powder Technology. 2016;303:68-75.
doi:10.1016/j.powtec.2016.09.025 .

Jaćimovski, Darko, Garić-Grulović, Radmila, Vucetić, Nemanja, Pjanović, Rada, Bošković-Vragolović, Nevenka, "Mass transfer and concentration boundary layer in a particulate fluidized bed" in Powder Technology, 303 (2016):68-75,
https://doi.org/10.1016/j.powtec.2016.09.025 . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Garić-Grulović, Radmila
AU  - Pjanović, Rada
AU  - Bošković-Vragolović, Nevenka
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2878
AB  - This paper presents the results of an experimental investigation of the mass transfer between the column wall and fluidized bed without and with fast, irreversible chemical reaction. Experiments were performed in the column 34 mm in diameter with inner channel filled with benzoic acid. The inert, spherical, glass particles with diameter of 1.94 mm were used as fluidized bed and the fluidization medium was aqueous solution of sodium hydroxide. In order to obtain a clear result of the impact of particles on the intensity of the mass transfer, experiments with and without chemical reaction are also done in systems without particles. The value of the enhancement factor of the mass transfer coefficient due to the presence of chemical reactions was found using experimental results. It was shown that the influence of the particles presence and the effect of chemical reactions have additive character on the mass transfer. The chemical reaction in systems without particles increases mass transfer coefficients 20 times, while the presence of fluidized particles increases the mass transfer coefficients 28 times. Obtained results showed good agreement with literature correlations. In order to establish analogies between momentum and mass transfer in a fluidized bed, with chemical reaction, experimental results are also presented.
PB  - 8th International Symposium on Turbulence, Heat and Mass Transfer, THMT 2015
T2  - Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer
T1  - Mass transfer without and with chemical reaction in particulate fluidized beds
EP  - 874
SP  - 871
VL  - 0
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2878
ER  - 

@article{
author = "Jaćimovski, Darko and Garić-Grulović, Radmila and Pjanović, Rada and Bošković-Vragolović, Nevenka",
year = "2015",
abstract = "This paper presents the results of an experimental investigation of the mass transfer between the column wall and fluidized bed without and with fast, irreversible chemical reaction. Experiments were performed in the column 34 mm in diameter with inner channel filled with benzoic acid. The inert, spherical, glass particles with diameter of 1.94 mm were used as fluidized bed and the fluidization medium was aqueous solution of sodium hydroxide. In order to obtain a clear result of the impact of particles on the intensity of the mass transfer, experiments with and without chemical reaction are also done in systems without particles. The value of the enhancement factor of the mass transfer coefficient due to the presence of chemical reactions was found using experimental results. It was shown that the influence of the particles presence and the effect of chemical reactions have additive character on the mass transfer. The chemical reaction in systems without particles increases mass transfer coefficients 20 times, while the presence of fluidized particles increases the mass transfer coefficients 28 times. Obtained results showed good agreement with literature correlations. In order to establish analogies between momentum and mass transfer in a fluidized bed, with chemical reaction, experimental results are also presented.",
publisher = "8th International Symposium on Turbulence, Heat and Mass Transfer, THMT 2015",
journal = "Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer",
title = "Mass transfer without and with chemical reaction in particulate fluidized beds",
pages = "874-871",
volume = "0",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2878"
}

Jaćimovski, D., Garić-Grulović, R., Pjanović, R.,& Bošković-Vragolović, N.. (2015). Mass transfer without and with chemical reaction in particulate fluidized beds. in Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer
8th International Symposium on Turbulence, Heat and Mass Transfer, THMT 2015., 0, 871-874.
https://hdl.handle.net/21.15107/rcub_technorep_2878

Jaćimovski D, Garić-Grulović R, Pjanović R, Bošković-Vragolović N. Mass transfer without and with chemical reaction in particulate fluidized beds. in Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer. 2015;0:871-874.
https://hdl.handle.net/21.15107/rcub_technorep_2878 .

Jaćimovski, Darko, Garić-Grulović, Radmila, Pjanović, Rada, Bošković-Vragolović, Nevenka, "Mass transfer without and with chemical reaction in particulate fluidized beds" in Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer, 0 (2015):871-874,
https://hdl.handle.net/21.15107/rcub_technorep_2878 .

TY  - JOUR
AU  - Đeković-Šević, Milica
AU  - Bošković-Vragolović, Nevenka
AU  - Takić, Ljiljana
AU  - Garić-Grulović, Radmila
AU  - Pejanović, Srđan
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2890
AB  - Experimental investigation of gas-liquid mass transfer of ozone in water, in bubble column with two-fluid nozzle gas distributor (BKDM), under different operating conditions, is presented in this work. The main objective was to determine the ozone volumetric mass transfer coefficient, kL a, in calm uniform section of the column, under different values of gas and liquid flow rates. Obtained values of these coefficients were compared with the values in countercurrent bubble column. The critical liquid flowrate, when gas hold up reaches its maximum, was experimentally determined. It was shown that the maximum value of the ozone volumetric mass transfer coefficient is obtained just when liquid flowrate is at its critical value.
AB  - U ovom radu prikazani su rezultati eksperimentalnih ispitivanja prenosa mase gas-tečnost pri ozonizaciji vode u barbotažnoj koloni sa dvofluidnom mlaznicom (BKDM) pod različitim operativnim uslovima. Cilj ovih ispitivanja bio je određivanje vrednosti zapreminskog koeficijenta prenosa mase ozona u vodi, kLa, u mirnoj zoni kolone, pri različitim protocima gasne i tečne faze. U radu je dato i poređenje kLa u BKDM sa vrednostima kLa u klasičnoj protivstrujnoj barbotažnoj koloni sa poroznom pločom tj. fritom. Eksperimentalno je određena vrednost kritičnog protoka tečnosti, pri kojem sadržaj gasa u disperziji, u mirnoj zoni kolone, dostiže svoju maksimalnu vrednost. Rezultati su pokazali da se pri kritičnom protoku tečnosti dobija maksimalna vrednost zapreminskog koeficijenta prenosa mase ozona u vodi.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Determination of the ozone volumetric mass transfer coefficient in bubble column with two-fluid nozzle gas distributor
T1  - Određivanje zapreminskog koeficijenta prenosa mase ozona u barbotažnoj koloni sa dvofluidnom mlaznicom
EP  - 559
IS  - 5
SP  - 553
VL  - 69
DO  - 10.2298/HEMIND140716075D
ER  - 

@article{
author = "Đeković-Šević, Milica and Bošković-Vragolović, Nevenka and Takić, Ljiljana and Garić-Grulović, Radmila and Pejanović, Srđan",
year = "2015",
abstract = "Experimental investigation of gas-liquid mass transfer of ozone in water, in bubble column with two-fluid nozzle gas distributor (BKDM), under different operating conditions, is presented in this work. The main objective was to determine the ozone volumetric mass transfer coefficient, kL a, in calm uniform section of the column, under different values of gas and liquid flow rates. Obtained values of these coefficients were compared with the values in countercurrent bubble column. The critical liquid flowrate, when gas hold up reaches its maximum, was experimentally determined. It was shown that the maximum value of the ozone volumetric mass transfer coefficient is obtained just when liquid flowrate is at its critical value., U ovom radu prikazani su rezultati eksperimentalnih ispitivanja prenosa mase gas-tečnost pri ozonizaciji vode u barbotažnoj koloni sa dvofluidnom mlaznicom (BKDM) pod različitim operativnim uslovima. Cilj ovih ispitivanja bio je određivanje vrednosti zapreminskog koeficijenta prenosa mase ozona u vodi, kLa, u mirnoj zoni kolone, pri različitim protocima gasne i tečne faze. U radu je dato i poređenje kLa u BKDM sa vrednostima kLa u klasičnoj protivstrujnoj barbotažnoj koloni sa poroznom pločom tj. fritom. Eksperimentalno je određena vrednost kritičnog protoka tečnosti, pri kojem sadržaj gasa u disperziji, u mirnoj zoni kolone, dostiže svoju maksimalnu vrednost. Rezultati su pokazali da se pri kritičnom protoku tečnosti dobija maksimalna vrednost zapreminskog koeficijenta prenosa mase ozona u vodi.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Determination of the ozone volumetric mass transfer coefficient in bubble column with two-fluid nozzle gas distributor, Određivanje zapreminskog koeficijenta prenosa mase ozona u barbotažnoj koloni sa dvofluidnom mlaznicom",
pages = "559-553",
number = "5",
volume = "69",
doi = "10.2298/HEMIND140716075D"
}

Đeković-Šević, M., Bošković-Vragolović, N., Takić, L., Garić-Grulović, R.,& Pejanović, S.. (2015). Determination of the ozone volumetric mass transfer coefficient in bubble column with two-fluid nozzle gas distributor. in Hemijska industrija
Association of Chemical Engineers of Serbia., 69(5), 553-559.
https://doi.org/10.2298/HEMIND140716075D

Đeković-Šević M, Bošković-Vragolović N, Takić L, Garić-Grulović R, Pejanović S. Determination of the ozone volumetric mass transfer coefficient in bubble column with two-fluid nozzle gas distributor. in Hemijska industrija. 2015;69(5):553-559.
doi:10.2298/HEMIND140716075D .

Đeković-Šević, Milica, Bošković-Vragolović, Nevenka, Takić, Ljiljana, Garić-Grulović, Radmila, Pejanović, Srđan, "Determination of the ozone volumetric mass transfer coefficient in bubble column with two-fluid nozzle gas distributor" in Hemijska industrija, 69, no. 5 (2015):553-559,
https://doi.org/10.2298/HEMIND140716075D . .

TY  - JOUR
AU  - Pravilović, Radoslava
AU  - Radunović, Vesna S.
AU  - Bošković-Vragolović, Nevenka
AU  - Bugarski, Branko
AU  - Pjanović, Rada
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2901
AB  - Polyphenols are compounds which are widely studied due to their antioxidative and potential therapeutic properties. Systems for the controlled release of drugs offer a number of benefits comparing with traditional forms of medicines and because of that these systems are widely researched. The objective of this paper is to investigate the possibility of using liposomes as carriers of polyphenols and influence of the membrane composition on the release rate of encapsulated polyphenols. Experiments show how the membrane modification affects the mass transfer comparing to a conventional liposomes. Liposomes were modified with surfactants Tween 20 and Tween 60, and thyme tea extract was used as a source of polyphenols. The diffusion of polyphenols from thyme extract, dispersion of conventional liposomes and liposomes modified with Tween 20 and Tween 60 were studied using Franz diffusion cell. From the experimental data diffusion coefficients were determined for each of the systems, as well as the corresponding diffusion resistances. From the obtained results it can be concluded that the encapsulation of polyphenols in liposomes significantly slows diffusion, and with membrane modification can be achieved further slowing. The diffusion resistance of the liposome membrane modified with Tween 20 and Tween 60 is about 5 times higher compared to the diffusion of unencapsulated polyphenols from the thyme extract.
AB  - Sistemi za kontrolisano otpuštanje lekova predstavljaju istraživačku oblast koja se intenzivno proučava zbog niza prednosti koje ovi sistemi pružaju i mogućeg unapređenja dosadašnjih, tradicionalnih formi lekova. Fosfolipidne mikročestice (lipozomi) su se pokazale potencijalno pogodnim nosačima aktivnih supstanci u sistemima ovog tipa. Predmet ovog rada je ispitivanje uticaja sastava membrane lipozoma na brzinu oslobađanja inkapsuliranih polifenola. Eksperimentalna ispitivanja su pokazala kako modifikacija membrane lipozoma utiče na prenos mase, u odnosu na konvencionalne lipozome. Lipozomi su modifikovani površinski aktivnim materijama Tween 20 i Tween 60, dok je kao izvor polifenola korišćen čajni ekstrakt biljke majčine dušice. Eksperimenti su izvedeni korišćenjem Franz-ove difuzione ćelije, u kojima je praćena difuzija polifenola iz: čajnog ekstrakta, disperzije konvencionalnih lipozoma, disperzije lipozoma modifikovanih pomoću Tween 20 i disperzije lipozoma modifikovanih pomoću Tween 60. Obradom eksperimentalnih rezultata određeni su koeficijenti difuzije za svaki od sistema, kao i odgovarajući difuzioni otpori. Na osnovu dobijenih rezultata može se zaključiti da se inkapsulacijom polifenola u fosfolipidne mikročestice-lipozome, značajno usporava njihova difuzija, a da se modifikacijom membrane može postići dodatno usporavanje prenosa mase, što zavisi od strukture molekula kojim se modifikacija vrši. Molekuli Tween 20 kao i Tween 60 su se pokazali uspešnim modifikatorima membrane lipozoma. Otpori koje membrane modifikovane navedenim polisorbatima pružaju difuziji polifenola su veći i dovode do 4,9 puta sporije difuzije u odnosu na sistem sa neinkapsuliranim polifenolima.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The influence of membrane composition on the release of polyphenols from liposomes
T1  - Uticaj sastava membrane na brzinu otpuštanja polifenola iz lipidnih mikročestica
EP  - 353
IS  - 4
SP  - 347
VL  - 69
DO  - 10.2298/HEMIND140220060P
ER  - 

@article{
author = "Pravilović, Radoslava and Radunović, Vesna S. and Bošković-Vragolović, Nevenka and Bugarski, Branko and Pjanović, Rada",
year = "2015",
abstract = "Polyphenols are compounds which are widely studied due to their antioxidative and potential therapeutic properties. Systems for the controlled release of drugs offer a number of benefits comparing with traditional forms of medicines and because of that these systems are widely researched. The objective of this paper is to investigate the possibility of using liposomes as carriers of polyphenols and influence of the membrane composition on the release rate of encapsulated polyphenols. Experiments show how the membrane modification affects the mass transfer comparing to a conventional liposomes. Liposomes were modified with surfactants Tween 20 and Tween 60, and thyme tea extract was used as a source of polyphenols. The diffusion of polyphenols from thyme extract, dispersion of conventional liposomes and liposomes modified with Tween 20 and Tween 60 were studied using Franz diffusion cell. From the experimental data diffusion coefficients were determined for each of the systems, as well as the corresponding diffusion resistances. From the obtained results it can be concluded that the encapsulation of polyphenols in liposomes significantly slows diffusion, and with membrane modification can be achieved further slowing. The diffusion resistance of the liposome membrane modified with Tween 20 and Tween 60 is about 5 times higher compared to the diffusion of unencapsulated polyphenols from the thyme extract., Sistemi za kontrolisano otpuštanje lekova predstavljaju istraživačku oblast koja se intenzivno proučava zbog niza prednosti koje ovi sistemi pružaju i mogućeg unapređenja dosadašnjih, tradicionalnih formi lekova. Fosfolipidne mikročestice (lipozomi) su se pokazale potencijalno pogodnim nosačima aktivnih supstanci u sistemima ovog tipa. Predmet ovog rada je ispitivanje uticaja sastava membrane lipozoma na brzinu oslobađanja inkapsuliranih polifenola. Eksperimentalna ispitivanja su pokazala kako modifikacija membrane lipozoma utiče na prenos mase, u odnosu na konvencionalne lipozome. Lipozomi su modifikovani površinski aktivnim materijama Tween 20 i Tween 60, dok je kao izvor polifenola korišćen čajni ekstrakt biljke majčine dušice. Eksperimenti su izvedeni korišćenjem Franz-ove difuzione ćelije, u kojima je praćena difuzija polifenola iz: čajnog ekstrakta, disperzije konvencionalnih lipozoma, disperzije lipozoma modifikovanih pomoću Tween 20 i disperzije lipozoma modifikovanih pomoću Tween 60. Obradom eksperimentalnih rezultata određeni su koeficijenti difuzije za svaki od sistema, kao i odgovarajući difuzioni otpori. Na osnovu dobijenih rezultata može se zaključiti da se inkapsulacijom polifenola u fosfolipidne mikročestice-lipozome, značajno usporava njihova difuzija, a da se modifikacijom membrane može postići dodatno usporavanje prenosa mase, što zavisi od strukture molekula kojim se modifikacija vrši. Molekuli Tween 20 kao i Tween 60 su se pokazali uspešnim modifikatorima membrane lipozoma. Otpori koje membrane modifikovane navedenim polisorbatima pružaju difuziji polifenola su veći i dovode do 4,9 puta sporije difuzije u odnosu na sistem sa neinkapsuliranim polifenolima.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The influence of membrane composition on the release of polyphenols from liposomes, Uticaj sastava membrane na brzinu otpuštanja polifenola iz lipidnih mikročestica",
pages = "353-347",
number = "4",
volume = "69",
doi = "10.2298/HEMIND140220060P"
}

Pravilović, R., Radunović, V. S., Bošković-Vragolović, N., Bugarski, B.,& Pjanović, R.. (2015). The influence of membrane composition on the release of polyphenols from liposomes. in Hemijska industrija
Association of Chemical Engineers of Serbia., 69(4), 347-353.
https://doi.org/10.2298/HEMIND140220060P

Pravilović R, Radunović VS, Bošković-Vragolović N, Bugarski B, Pjanović R. The influence of membrane composition on the release of polyphenols from liposomes. in Hemijska industrija. 2015;69(4):347-353.
doi:10.2298/HEMIND140220060P .

Pravilović, Radoslava, Radunović, Vesna S., Bošković-Vragolović, Nevenka, Bugarski, Branko, Pjanović, Rada, "The influence of membrane composition on the release of polyphenols from liposomes" in Hemijska industrija, 69, no. 4 (2015):347-353,
https://doi.org/10.2298/HEMIND140220060P . .

TY  - JOUR
AU  - Pešić, Radojica
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2926
AB  - The aim of this work was the experimental investigation of the particle friction factor for air flow through a packed bed of particles at ambient and elevated temperatures. The experiments were performed by measuring the pressure drop across the packed bed, heated to the desired temperature by hot air. Glass spherical particles of seven different diameters were used. The temperature range of the air flowing through the packed bed was from 20 to 350°C and the bed voidages were from 0.3574 to 0.4303. The obtained results were correlated using a number of available literature correlations. The overall best fit of all of the experimental data was obtained using the Ergun equation, with mean absolute deviation of 10.90%. Ergun's equation gave somewhat better results in correlating the data at ambient temperature with mean absolute deviation of 9.77%, while correlation of the data at elevated temperatures gave mean absolute deviation of 12.38%. The vast majority of the correlations used gave better results when applied to ambient temperature data than to the data at elevated temperatures. Based on the results obtained, the Ergun equation is proposed for friction factor calculation both at ambient and at elevated temperatures.
AB  - Cilj ovog rada je bio eksperimentalno ispitivanje koeficijenta trenja fluid-čestice prilikom strujanja vazduha kroz pakovani sloj čestica, na sobnoj i povišenim temperaturama. Izvršeno je eksperimentalno merenje pada pritiska u pakovanim slojevima različitih temperatura zagrejanih korišćenjem vrelog vazduha. Kao materijal za pakovanje korišćene su sferične staklene kuglice 7 različitih prečnika. Temperaturni interval u kom su vršeni eksperimenti bio je od 20 do 350°C, dok su poroznosti sloja iznosile od 0,3574 do 0,4303. Dobijeni rezultati korelisani su korišćenjem većeg broja literaturnih korelacija. Najbolje slaganje sa eksperimentalnim podacima pokazala je Ergunova jednačina [1], sa srednjim procentnim odstupanjem od 10,90%. Ergunova jednačina je dala bolje rezultate prilikom korelisanja podataka na sobnoj temperaturi (srednja procentna greška 9,77%), dok je korelisanje podataka na povišenim temperaturama izvršeno sa greškom od 12,38%. Većina testiranih literaturnih korelacija je dala bolje rezultate pri korelisanju podataka dobijenih na sobnoj temperaturi u odnosu na podatke dobijene na povišenim temperaturama. Na osnovu dobijenih rezultata, predlaže se korišćenje Ergunove jednačine za izračunavanje koeficijenta trenja fluid-čestice kako na sobnoj, tako i na povišenim temperaturama.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures
T1  - Pad pritiska u pakovanom sloju sferičnih čestica na sobnoj i povišenim temperaturama
EP  - 427
IS  - 3
SP  - 419
VL  - 21
DO  - 10.2298/CICEQ140618044P
ER  - 

@article{
author = "Pešić, Radojica and Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Arsenijević, Zorana and Grbavčić, Željko",
year = "2015",
abstract = "The aim of this work was the experimental investigation of the particle friction factor for air flow through a packed bed of particles at ambient and elevated temperatures. The experiments were performed by measuring the pressure drop across the packed bed, heated to the desired temperature by hot air. Glass spherical particles of seven different diameters were used. The temperature range of the air flowing through the packed bed was from 20 to 350°C and the bed voidages were from 0.3574 to 0.4303. The obtained results were correlated using a number of available literature correlations. The overall best fit of all of the experimental data was obtained using the Ergun equation, with mean absolute deviation of 10.90%. Ergun's equation gave somewhat better results in correlating the data at ambient temperature with mean absolute deviation of 9.77%, while correlation of the data at elevated temperatures gave mean absolute deviation of 12.38%. The vast majority of the correlations used gave better results when applied to ambient temperature data than to the data at elevated temperatures. Based on the results obtained, the Ergun equation is proposed for friction factor calculation both at ambient and at elevated temperatures., Cilj ovog rada je bio eksperimentalno ispitivanje koeficijenta trenja fluid-čestice prilikom strujanja vazduha kroz pakovani sloj čestica, na sobnoj i povišenim temperaturama. Izvršeno je eksperimentalno merenje pada pritiska u pakovanim slojevima različitih temperatura zagrejanih korišćenjem vrelog vazduha. Kao materijal za pakovanje korišćene su sferične staklene kuglice 7 različitih prečnika. Temperaturni interval u kom su vršeni eksperimenti bio je od 20 do 350°C, dok su poroznosti sloja iznosile od 0,3574 do 0,4303. Dobijeni rezultati korelisani su korišćenjem većeg broja literaturnih korelacija. Najbolje slaganje sa eksperimentalnim podacima pokazala je Ergunova jednačina [1], sa srednjim procentnim odstupanjem od 10,90%. Ergunova jednačina je dala bolje rezultate prilikom korelisanja podataka na sobnoj temperaturi (srednja procentna greška 9,77%), dok je korelisanje podataka na povišenim temperaturama izvršeno sa greškom od 12,38%. Većina testiranih literaturnih korelacija je dala bolje rezultate pri korelisanju podataka dobijenih na sobnoj temperaturi u odnosu na podatke dobijene na povišenim temperaturama. Na osnovu dobijenih rezultata, predlaže se korišćenje Ergunove jednačine za izračunavanje koeficijenta trenja fluid-čestice kako na sobnoj, tako i na povišenim temperaturama.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures, Pad pritiska u pakovanom sloju sferičnih čestica na sobnoj i povišenim temperaturama",
pages = "427-419",
number = "3",
volume = "21",
doi = "10.2298/CICEQ140618044P"
}

Pešić, R., Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Arsenijević, Z.,& Grbavčić, Ž.. (2015). Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 21(3), 419-427.
https://doi.org/10.2298/CICEQ140618044P

Pešić R, Kaluđerović-Radoičić T, Bošković-Vragolović N, Arsenijević Z, Grbavčić Ž. Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures. in Chemical Industry & Chemical Engineering Quarterly. 2015;21(3):419-427.
doi:10.2298/CICEQ140618044P .

Pešić, Radojica, Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Arsenijević, Zorana, Grbavčić, Željko, "Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures" in Chemical Industry & Chemical Engineering Quarterly, 21, no. 3 (2015):419-427,
https://doi.org/10.2298/CICEQ140618044P . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Garić-Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Bošković-Vragolović, Nevenka
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2971
AB  - Wall-to-bed heat transfer in particulate fluidized beds of spherical particles was studied. Experiments were performed using spherical glass particles of 0.80-2.98 mm in diameter with water in a 25.4 mm I.D. copper tube equipped with a steam jacket. Heat transfer data related to the fluid-particle interphase drag coefficient were obtained and compared with previous results for wall-to-bed mass transfer in fluidized beds [Bogkovit et aL, Powder Technol., 79 (1994) 217]. All the data for momentum, heat and mass transfer in particulate fluidized beds of spherical particles, showed the existence of an analogy among these three phenomena.
PB  - Elsevier Science Bv, Amsterdam
T2  - Powder Technology
T1  - Analogy between momentum and heat transfer in liquid-solid fluidized beds
EP  - 216
SP  - 213
VL  - 274
DO  - 10.1016/j.powtec.2014.11.010
ER  - 

@article{
author = "Jaćimovski, Darko and Garić-Grulović, Radmila and Grbavčić, Željko and Bošković-Vragolović, Nevenka",
year = "2015",
abstract = "Wall-to-bed heat transfer in particulate fluidized beds of spherical particles was studied. Experiments were performed using spherical glass particles of 0.80-2.98 mm in diameter with water in a 25.4 mm I.D. copper tube equipped with a steam jacket. Heat transfer data related to the fluid-particle interphase drag coefficient were obtained and compared with previous results for wall-to-bed mass transfer in fluidized beds [Bogkovit et aL, Powder Technol., 79 (1994) 217]. All the data for momentum, heat and mass transfer in particulate fluidized beds of spherical particles, showed the existence of an analogy among these three phenomena.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Powder Technology",
title = "Analogy between momentum and heat transfer in liquid-solid fluidized beds",
pages = "216-213",
volume = "274",
doi = "10.1016/j.powtec.2014.11.010"
}

Jaćimovski, D., Garić-Grulović, R., Grbavčić, Ž.,& Bošković-Vragolović, N.. (2015). Analogy between momentum and heat transfer in liquid-solid fluidized beds. in Powder Technology
Elsevier Science Bv, Amsterdam., 274, 213-216.
https://doi.org/10.1016/j.powtec.2014.11.010

Jaćimovski D, Garić-Grulović R, Grbavčić Ž, Bošković-Vragolović N. Analogy between momentum and heat transfer in liquid-solid fluidized beds. in Powder Technology. 2015;274:213-216.
doi:10.1016/j.powtec.2014.11.010 .

Jaćimovski, Darko, Garić-Grulović, Radmila, Grbavčić, Željko, Bošković-Vragolović, Nevenka, "Analogy between momentum and heat transfer in liquid-solid fluidized beds" in Powder Technology, 274 (2015):213-216,
https://doi.org/10.1016/j.powtec.2014.11.010 . .

TY  - JOUR
AU  - Jacimovski, D.
AU  - Garic-Grulovic, R.
AU  - Pjanović, Rada
AU  - Bošković-Vragolović, Nevenka
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4732
AB  - This paper presents the results of an experimental investigation of the mass transfer between the column wall and fluidized bed without and with fast, irreversible chemical reaction. Experiments were performed in the column 34 mm in diameter with inner channel filled with benzoic acid. The inert, spherical, glass particles with diameter of 1.94 mm were used as fluidized bed and the fluidization medium was aqueous solution of sodium hydroxide. In order to obtain a clear result of the impact of particles on the intensity of the mass transfer, experiments with and without chemical reaction are also done in systems without particles. The value of the enhancement factor of the mass transfer coefficient due to the presence of chemical reactions was found using experimental results. It was shown that the influence of the particles presence and the effect of chemical reactions have additive character on the mass transfer. The chemical reaction in systems without particles increases mass transfer coefficients 20 times, while the presence of fluidized particles increases the mass transfer coefficients 28 times. Obtained results showed good agreement with literature correlations. In order to establish analogies between momentum and mass transfer in a fluidized bed, with chemical reaction, experimental results are also presented.
T2  - Proceedings of the Eighth International Symposium on Turbulence Heat and Mass Transfer (Thmt-15)
T1  - Mass transfer without and with chemical reaction in particulate fluidized beds
EP  - 874
SP  - 871
DO  - 10.1615/ICHMT.2015.THMT-15.1980
ER  - 

@article{
author = "Jacimovski, D. and Garic-Grulovic, R. and Pjanović, Rada and Bošković-Vragolović, Nevenka",
year = "2015",
abstract = "This paper presents the results of an experimental investigation of the mass transfer between the column wall and fluidized bed without and with fast, irreversible chemical reaction. Experiments were performed in the column 34 mm in diameter with inner channel filled with benzoic acid. The inert, spherical, glass particles with diameter of 1.94 mm were used as fluidized bed and the fluidization medium was aqueous solution of sodium hydroxide. In order to obtain a clear result of the impact of particles on the intensity of the mass transfer, experiments with and without chemical reaction are also done in systems without particles. The value of the enhancement factor of the mass transfer coefficient due to the presence of chemical reactions was found using experimental results. It was shown that the influence of the particles presence and the effect of chemical reactions have additive character on the mass transfer. The chemical reaction in systems without particles increases mass transfer coefficients 20 times, while the presence of fluidized particles increases the mass transfer coefficients 28 times. Obtained results showed good agreement with literature correlations. In order to establish analogies between momentum and mass transfer in a fluidized bed, with chemical reaction, experimental results are also presented.",
journal = "Proceedings of the Eighth International Symposium on Turbulence Heat and Mass Transfer (Thmt-15)",
title = "Mass transfer without and with chemical reaction in particulate fluidized beds",
pages = "874-871",
doi = "10.1615/ICHMT.2015.THMT-15.1980"
}

Jacimovski, D., Garic-Grulovic, R., Pjanović, R.,& Bošković-Vragolović, N.. (2015). Mass transfer without and with chemical reaction in particulate fluidized beds. in Proceedings of the Eighth International Symposium on Turbulence Heat and Mass Transfer (Thmt-15), 871-874.
https://doi.org/10.1615/ICHMT.2015.THMT-15.1980

Jacimovski D, Garic-Grulovic R, Pjanović R, Bošković-Vragolović N. Mass transfer without and with chemical reaction in particulate fluidized beds. in Proceedings of the Eighth International Symposium on Turbulence Heat and Mass Transfer (Thmt-15). 2015;:871-874.
doi:10.1615/ICHMT.2015.THMT-15.1980 .

Jacimovski, D., Garic-Grulovic, R., Pjanović, Rada, Bošković-Vragolović, Nevenka, "Mass transfer without and with chemical reaction in particulate fluidized beds" in Proceedings of the Eighth International Symposium on Turbulence Heat and Mass Transfer (Thmt-15) (2015):871-874,
https://doi.org/10.1615/ICHMT.2015.THMT-15.1980 . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Garić-Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Đuriš, Mihal
AU  - Bošković-Vragolović, Nevenka
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2645
AB  - Wall-to-bed momentum, heat and mass transfer in the vertical liquid-solids flow, as well as in the single phase flow, were studied. The aim of this investigation was to establish the analogy among those phenomena. Also, effect of particle concentration on momentum, heat and mass transfer was studied. The experiments in hydraulic transport were performed in 25.4 mm I.D. cooper tube equipped with a steam jacket, using spherical glass particles of 1.94 mm in diameter and water as a transport fluid. The segment of the transport tube used for mass transfer measurements had internal coating made of benzoic acid. In the hydraulic transport two characteristic flow regimes were observed: turbulent and parallel particle flow regime. The transition between two characteristic regimes (Y* = 0), occurs at a critical voidage ε ≈ 0.85. The vertical two-phase flow was con­sidered as the pseudofluid, and modified mixture-wall friction coefficient (fw) and modified mixture Reynolds number (Rem) were introduced for system characterization. Experimental data show that the wall-to-bed momentum, heat and mass transfer coefficients, in vertical flow of pseudofluid, for the turbulent regime are significantly higher than in parallel regime. Wall-to-bed, mass and heat transfer coefficients in hydraulic transport of particles were much higher than in single-phase flow for lower Reynolds numbers (Re  lt  15000), while for high Reynolds numbers (Re  gt  15000), there was not significant difference. The experimental data for wall-to-bed momentum, heat and mass transfer in vertical flow of pseudofluid in parallel particle flow regime, verify analogy among these three phenomena.
AB  - U ovom radu prikazani su rezultati eksperimentalnih ispitivanja prenosa količine kretanja, toplote i mase zid-fluid u vertikalnom hidrauličkom transportu inertnih čestica i pri strujanju fluida u cevi istog prečnika. Eksperimentalna ispitivanja vršena su istovremenim merenjem potrebnih parametara za definisanje navedenih prenosa. Cilj ovih ispitivanja bio je određivanje koeficijenata prenosa pri vertikalnom hidrauličkom transportu inertnih čestica i uspostavljanje analogije tri prenosa. Eksperimentalni sistem predstavljala je vertikalna transportna cev prečnika 25,4 mm snabdevena omotačem za zagrevanje parom, kao i segmentom transportne cevi prepariranim rastopom benzoeve kiseline. Kao fluid korišćena je voda, a vršen je transport staklenih sfernih čestica prečnika 1,94 mm. U rezultatima su prikazani dobijeni koeficijenti trenja, prelaza toplote i prelaza mase. Korišćenjem koncepta pseudofluida, pokazano je postojanje analogije prenosa količine kretanja, toplote i mase u transportnoj cevi za paralelni režim strujanja.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles
T1  - Analogija prenosa količine kretanja, toplote i mase pri vertikalnom hidrauličkom transportu inertnih čestica
EP  - 25
IS  - 1
SP  - 15
VL  - 68
DO  - 10.2298/HEMIND130207025J
ER  - 

@article{
author = "Jaćimovski, Darko and Garić-Grulović, Radmila and Grbavčić, Željko and Đuriš, Mihal and Bošković-Vragolović, Nevenka",
year = "2014",
abstract = "Wall-to-bed momentum, heat and mass transfer in the vertical liquid-solids flow, as well as in the single phase flow, were studied. The aim of this investigation was to establish the analogy among those phenomena. Also, effect of particle concentration on momentum, heat and mass transfer was studied. The experiments in hydraulic transport were performed in 25.4 mm I.D. cooper tube equipped with a steam jacket, using spherical glass particles of 1.94 mm in diameter and water as a transport fluid. The segment of the transport tube used for mass transfer measurements had internal coating made of benzoic acid. In the hydraulic transport two characteristic flow regimes were observed: turbulent and parallel particle flow regime. The transition between two characteristic regimes (Y* = 0), occurs at a critical voidage ε ≈ 0.85. The vertical two-phase flow was con­sidered as the pseudofluid, and modified mixture-wall friction coefficient (fw) and modified mixture Reynolds number (Rem) were introduced for system characterization. Experimental data show that the wall-to-bed momentum, heat and mass transfer coefficients, in vertical flow of pseudofluid, for the turbulent regime are significantly higher than in parallel regime. Wall-to-bed, mass and heat transfer coefficients in hydraulic transport of particles were much higher than in single-phase flow for lower Reynolds numbers (Re  lt  15000), while for high Reynolds numbers (Re  gt  15000), there was not significant difference. The experimental data for wall-to-bed momentum, heat and mass transfer in vertical flow of pseudofluid in parallel particle flow regime, verify analogy among these three phenomena., U ovom radu prikazani su rezultati eksperimentalnih ispitivanja prenosa količine kretanja, toplote i mase zid-fluid u vertikalnom hidrauličkom transportu inertnih čestica i pri strujanju fluida u cevi istog prečnika. Eksperimentalna ispitivanja vršena su istovremenim merenjem potrebnih parametara za definisanje navedenih prenosa. Cilj ovih ispitivanja bio je određivanje koeficijenata prenosa pri vertikalnom hidrauličkom transportu inertnih čestica i uspostavljanje analogije tri prenosa. Eksperimentalni sistem predstavljala je vertikalna transportna cev prečnika 25,4 mm snabdevena omotačem za zagrevanje parom, kao i segmentom transportne cevi prepariranim rastopom benzoeve kiseline. Kao fluid korišćena je voda, a vršen je transport staklenih sfernih čestica prečnika 1,94 mm. U rezultatima su prikazani dobijeni koeficijenti trenja, prelaza toplote i prelaza mase. Korišćenjem koncepta pseudofluida, pokazano je postojanje analogije prenosa količine kretanja, toplote i mase u transportnoj cevi za paralelni režim strujanja.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles, Analogija prenosa količine kretanja, toplote i mase pri vertikalnom hidrauličkom transportu inertnih čestica",
pages = "25-15",
number = "1",
volume = "68",
doi = "10.2298/HEMIND130207025J"
}

Jaćimovski, D., Garić-Grulović, R., Grbavčić, Ž., Đuriš, M.,& Bošković-Vragolović, N.. (2014). Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles. in Hemijska industrija
Association of Chemical Engineers of Serbia., 68(1), 15-25.
https://doi.org/10.2298/HEMIND130207025J

Jaćimovski D, Garić-Grulović R, Grbavčić Ž, Đuriš M, Bošković-Vragolović N. Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles. in Hemijska industrija. 2014;68(1):15-25.
doi:10.2298/HEMIND130207025J .

Jaćimovski, Darko, Garić-Grulović, Radmila, Grbavčić, Željko, Đuriš, Mihal, Bošković-Vragolović, Nevenka, "Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles" in Hemijska industrija, 68, no. 1 (2014):15-25,
https://doi.org/10.2298/HEMIND130207025J . .