Naslov
Influence of temperature on extraction kinetics and effective diffusivity of total polyphenols from grape seeds

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

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of 2nd International Symposium on Agriculture, / Pospišil, Milan - Zagreb : Agronomski fakultet Sveučilišta u Zagrebu, 2007, 619-622

ISBN
978-953-6135-57-8

Skup
42. hrvatski i 2. međunarodni simpozij agronoma

Mjesto i datum
Opatija, Hrvatska, 13.02.2007. - 16.02.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
grape seeds; effective diffusivity; extraction kinetics; total polyphenols

Sažetak
The solid liquid extractions of total polyphenols from grape (Frankovka) seeds using of 50% aqueous ethanol as solvent at different temperature regimes were undertaken. The polyphenols in the extracts was determined by Folin Ciocalteau method and results were expressed as gallic acid equivalent. 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 ~ 0.99). The effective diffusivity was calculated by Fick’ s law of diffusion. The highest value of polyphenol concentration (129.59 mg GAE/gdb) and effective diffusivity (1.96• 10-12 m2/s) were obtained at the 80 °C.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija, Prehrambena tehnologija

POVEZANOST RADA