TY  - CONF
AU  - Milovanović, Stoja
AU  - Lukić, Ivana
AU  - Pajnik, Jelena
AU  - Maksimović, Svetolik
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6895
AB  - Starch is an abundant and low-cost polysaccharide obtained from renewable resources. Biocompatibility, biodegradability, and versatility of starch enable its application in several industries including food and pharmaceutical.
In this work, supercritical CO2 drying process was tested for preparation of stable and porous starch-based material. First, a hydrogel was formed from an aqueous solution (cornstarch to water mass ratio 1:10) at 95 °C. Subsequently, water was replaced with acetone during several days to form an acetogel. Finally, acetogels were subjected to supercritical CO2 drying at pressures of 8, 10, 20 MPa and temperatures of 35 and 45 °C up to 3 h to form aerogels. Obtained aerogels were compared with starch xerogels prepared by air drying of acetogels.
The SEM, FTIR, and porosity analysis confirmed significant effect of supercritical CO2 drying process conditions on starch aerogels properties and their suitability to form nanostructured matrices. SEM analysis showed that aerogels were filamentous with filament diameter less than 100 nm. Due to their low density (0.273-0.773 g/cm3) and high porosity (48-82%) obtained starch aerogels present promising candidates as matrices and carriers for bioactive substances.
C3  - 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France
T1  - Effect of supercritical CO2 drying process conditions on starch aerogel properties
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6895
ER  - 

@conference{
author = "Milovanović, Stoja and Lukić, Ivana and Pajnik, Jelena and Maksimović, Svetolik",
year = "2021",
abstract = "Starch is an abundant and low-cost polysaccharide obtained from renewable resources. Biocompatibility, biodegradability, and versatility of starch enable its application in several industries including food and pharmaceutical.
In this work, supercritical CO2 drying process was tested for preparation of stable and porous starch-based material. First, a hydrogel was formed from an aqueous solution (cornstarch to water mass ratio 1:10) at 95 °C. Subsequently, water was replaced with acetone during several days to form an acetogel. Finally, acetogels were subjected to supercritical CO2 drying at pressures of 8, 10, 20 MPa and temperatures of 35 and 45 °C up to 3 h to form aerogels. Obtained aerogels were compared with starch xerogels prepared by air drying of acetogels.
The SEM, FTIR, and porosity analysis confirmed significant effect of supercritical CO2 drying process conditions on starch aerogels properties and their suitability to form nanostructured matrices. SEM analysis showed that aerogels were filamentous with filament diameter less than 100 nm. Due to their low density (0.273-0.773 g/cm3) and high porosity (48-82%) obtained starch aerogels present promising candidates as matrices and carriers for bioactive substances.",
journal = "18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France",
title = "Effect of supercritical CO2 drying process conditions on starch aerogel properties",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6895"
}

Milovanović, S., Lukić, I., Pajnik, J.,& Maksimović, S.. (2021). Effect of supercritical CO2 drying process conditions on starch aerogel properties. in 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France.
https://hdl.handle.net/21.15107/rcub_technorep_6895

Milovanović S, Lukić I, Pajnik J, Maksimović S. Effect of supercritical CO2 drying process conditions on starch aerogel properties. in 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France. 2021;.
https://hdl.handle.net/21.15107/rcub_technorep_6895 .

Milovanović, Stoja, Lukić, Ivana, Pajnik, Jelena, Maksimović, Svetolik, "Effect of supercritical CO2 drying process conditions on starch aerogel properties" in 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France (2021),
https://hdl.handle.net/21.15107/rcub_technorep_6895 .

TY  - CONF
AU  - Maksimović, Svetolik
AU  - Milovanović, Stoja
AU  - Ivanović, Jasna
AU  - Žižović, Irena
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6896
AB  - The coupling of supercritical fluid extraction and supercritical solvent impregnation processes has been proved to be convenient in cases where the active substance, to be incorporated in the solid carrier, is supercritical extract. The integrated process enables minimizing the loss of the extract by directly using the supercritical CO2-extract solution leaving the extractor vessel for the impregnation and avoidance of the intermediate decompression step in the separate processes (decompression after extraction), and consequently leads to energy and time savings.
The objective of this work was to examine the application of the integrated process for impregnation of chitosan/alginate and corn starch xerogels and aerogels with Helichrysum italicum supercritical CO2 extract. For that purpose, first chitosan/alginate and starch hydrogels were prepared by sol-gel method. Thereafter hydrogels were transformed into alcogels by water exchange with ethanol or acetone. Xerogels and aerogels were produced by air and supercritical CO2 drying of the alcogels or acetogels, respectively. Finally, impregnation of the xerogels and aerogels was performed in the laboratory unit for the integrated processes.
Both chitosan/alginate and starch xerogels and aerogels showed significant affinity for the incorporation of active principles from H. italicum which was confirmed by FTIR method. SEM method indicated significant differences in materials’ porosity. One of the reason for this is pore collapse phenomenon associated the formation of the xerogels. Obtained results confirmed that it is possible to impregnate chitosan/alginate and starch xerogels and aerogels with H. italicum extract by the integrated process of supercritical CO2 extraction and impregnation.
C3  - 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France
T1  - The integrated process of supercritical CO2 extraction from Helichrysum italicum and supercritical impregnation of biocompatible polymers with the obtained extract
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6896
ER  - 

@conference{
author = "Maksimović, Svetolik and Milovanović, Stoja and Ivanović, Jasna and Žižović, Irena",
year = "2021",
abstract = "The coupling of supercritical fluid extraction and supercritical solvent impregnation processes has been proved to be convenient in cases where the active substance, to be incorporated in the solid carrier, is supercritical extract. The integrated process enables minimizing the loss of the extract by directly using the supercritical CO2-extract solution leaving the extractor vessel for the impregnation and avoidance of the intermediate decompression step in the separate processes (decompression after extraction), and consequently leads to energy and time savings.
The objective of this work was to examine the application of the integrated process for impregnation of chitosan/alginate and corn starch xerogels and aerogels with Helichrysum italicum supercritical CO2 extract. For that purpose, first chitosan/alginate and starch hydrogels were prepared by sol-gel method. Thereafter hydrogels were transformed into alcogels by water exchange with ethanol or acetone. Xerogels and aerogels were produced by air and supercritical CO2 drying of the alcogels or acetogels, respectively. Finally, impregnation of the xerogels and aerogels was performed in the laboratory unit for the integrated processes.
Both chitosan/alginate and starch xerogels and aerogels showed significant affinity for the incorporation of active principles from H. italicum which was confirmed by FTIR method. SEM method indicated significant differences in materials’ porosity. One of the reason for this is pore collapse phenomenon associated the formation of the xerogels. Obtained results confirmed that it is possible to impregnate chitosan/alginate and starch xerogels and aerogels with H. italicum extract by the integrated process of supercritical CO2 extraction and impregnation.",
journal = "18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France",
title = "The integrated process of supercritical CO2 extraction from Helichrysum italicum and supercritical impregnation of biocompatible polymers with the obtained extract",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6896"
}

Maksimović, S., Milovanović, S., Ivanović, J.,& Žižović, I.. (2021). The integrated process of supercritical CO2 extraction from Helichrysum italicum and supercritical impregnation of biocompatible polymers with the obtained extract. in 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France.
https://hdl.handle.net/21.15107/rcub_technorep_6896

Maksimović S, Milovanović S, Ivanović J, Žižović I. The integrated process of supercritical CO2 extraction from Helichrysum italicum and supercritical impregnation of biocompatible polymers with the obtained extract. in 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France. 2021;.
https://hdl.handle.net/21.15107/rcub_technorep_6896 .

Maksimović, Svetolik, Milovanović, Stoja, Ivanović, Jasna, Žižović, Irena, "The integrated process of supercritical CO2 extraction from Helichrysum italicum and supercritical impregnation of biocompatible polymers with the obtained extract" in 18th European Meeting of Supercritical fluids (EMSF), 3-6 May 2021, Bordeaux, France (2021),
https://hdl.handle.net/21.15107/rcub_technorep_6896 .