Naslov
Influence of Acidity and Extraction Time on the Recovery of Flavonoids from Grape Skin Pomace Optimized by Response Surface Methodology

Autori
Putnik, Predrag ; Bursać Kovačević, Danijela ; Radojčin, M. ; Dragović-Uzelac, Verica

Izvornik
Chemical and biochemical engeenering quaterly (0352-9568) 30 (2016), 4; 455-464

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
total flavonoids ; proanthocyanidins ; anthocyanins ; flavonols ; optimal extraction acidity/time ; grape pomace skin extracts

Sažetak
Grape pomace is recognized as an economical source for the recovery of a large number of biologically active compounds, such as polyphenols. Grape pomace extracts can be successfully used as raw material for functional foods production, since they are generally recognized as safe for the food industry. This study aimed to quantify the amounts of recovered flavonoids (total flavonoids, proanthocyanidins, anthocyanins, and flavonols) from grape skin pomace (Vitis vinifera L. cv. Merlot) under conventional extraction with different acidities (0.5 % – 1 % HCl) and lengths of extraction time (30–60 minutes). The grand average values in this study were as follows: (i) proanthocyanidins 12.08±0.25 mg CE g–1 d.m., (ii) anthocyanins 2.17±1.02 mg Mvd-3-glc g–1 d.m., (iii) flavonols 7.73±0.11 mg QE g–1 d.m., and (iv) total flavonoids 36.28±0.42 mg QE g–1 d.m. The amounts of studied polyphenols generally increased with acidity and length of extraction time. This relation was more evident for flavonols and total flavonoids, while less clear for other examined phenolics.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA