Naslov
Study of Solid-Liquid Extraction Kinetics of Total Polyphenols from Grape Seeds

Autori
Bucić-Kojić, Ana ; Planinić, Mirela ; Tomas, Srećko ; Bilić, Mate ; Velić, Darko

Izvornik
Journal of Food Engineering (0260-8774) 81 (2007), 1; 236-242

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

Ključne riječi
grape seeds ; total polyphenols ; solid-liquid extraction ; 50% aqueous ethanol ; temperatures ; solid-liquid ratio ; particle size ; Peleg’ s model

Sažetak
Grape seeds are a waste by-product obtained after wine or juice making and present a good source of functional compounds, such as polyphenols. Extraction is a very important step for later use of phenolic components. The effect of different temperatures and solid-liquid ratios on the solid-liquid extraction yield of total polyphenols and the effect of four classes of particle size on the extraction kinetics of total polyphenols with 50% of aqueous ethanol were studied. Temperature, solid-liquid ratio and milling degree had positive influence on extraction rate and extent of extraction. The 1.47 - 6.68% of total polyphenols per dry matter of grape seeds was extracted during 200 minutes. Extraction kinetic was estimated using non experimental two-parameter equation - modified Peleg´s model. Results showed a good prediction of Peleg´s model for extraction kinetics in all experiments (R > 0.994), which gave the possibility for estimation of initial rate and extent of solid-liquid extraction.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija

POVEZANOST RADA