Optimization of the extraction process from Satureja montana L.: physicochemical characterization of the extracts

Abstract

The presented study aimed to optimize polyphenol extraction from Satureja montana L. obtained from the experimental field of the Institute for Medicinal Plants Research ”Dr Josif Pančić”, Serbia, by varying the most important parameters for maceration, solid-to-solvent ratio, and extraction time. The obtained extracts were characterized regarding the total polyphenol content (TPC), total flavonoid content (TFC), antioxidant potential, extraction yield, conductivity, density, surface tension, and viscosity. The TPC and TFC were ~7 to 92 mg GAE (gallic acid equivalent)/g and 3.7 to 10.9 mg CE (catechin equivalent)/g, respectively. The highest extraction yield (86 %) as well as the highest antioxidant activities were obtained for the extracts prepared using a solid-to-solvent ratio of 1 g:50 cm3. On the other hand, the extraction time did not have a significant influence. The highest conductivity was measured in the extract prepared at a 1 g:10 cm3 ratio, while the highest density and surface tension were in the extract prepared at a 1 g:40 cm3 ratio (941 kg m-3 and 29.0 mN m-1, respectively). The highest viscosity was measured in the extract prepared at a 1 g: 20 cm3 ratio (2.89 mPa∙s). Our study shows the possibilities for the production of polyphenol-rich extract of S. montana which might be used in pharmaceutical, food, or cosmetic products.

Prikazana studija je imala za cilj da optimizuje ekstrakciju polifenola izbiljkeSatureja montanaL. sa oglednog polja Instituta za proučavanjelekovitog bilja „Dr Josif Pančić“, Srbija, variranjem najvažnijih parametara maceracije, odnosa biljnog materijala i rastvarača,i ekstrakcionogvremena. Dobijeni ekstrakti su okarakterisani u pogleduukupnog sadržaja polifenola (engl.total total polyphenol content, TPC), ukupnog sadržaja flavonoida (engl.total flavonoid content,TFC), antioksidativnog potencijala, prinosa ekstrakcije, provodljivosti, gustine, površinskog napona i viskoznosti. Vrednostiukupnog sadržaja polifenola(engl.Total Polyphenol Content -TPC)iukupnog sadržaja flavonoida (engl.Total Flavonoid Content -TFC)su bile u opsezima7,2-92,2 mg ekvivalenta galne kiseline (engl.gallic acid equivalentGAE) /g i 3,7-10,9 mgekvivalenta katehina(engl.catechinequivalentCE)/g, redom. Najveće antioksidativne aktivnosti dobijenesu u ekstraktima pripremljenim u odnosu biljnog materijala i rastvarača1g :50cm-3. Najveći prinos ekstrakcije takođe je dobijenu tom ekstraktu (86,0%), dok vreme ekstrakcije nije imalo značajan uticaj. Najveća provodljivost izmerena je u ekstraktu pripremljenom u odnosu biljnog materijala i rastvarača1g :10cm-3. Najvećagustina i površinski napon su bili u ekstraktu pripremljenom u odnosu 1g :40cm-3(941 kg m-3i 29,0 mNm-1, redom). Najvećaviskoznostje izmerenau ekstraktu pripremljenom u odnosu 1g :20cm-3(2,89 mPa∙s). Naša studija pokazuje mogućnosti za proizvodnju polifenolima bogatog ekstraktabiljkeS. montanakoji se može koristiti u farmaceutskim, prehrambenim ili kozmetičkim proizvodima.