关键词: 葡萄籽, 原花青素, 提取, 动力学

Abstract:

According to the mass transfer mechanism, the extraction process of grape seed procyanidins could be described with the concentration of procyanidins. In the present study, a kinetic equation was established on the basis of mass equilibrium. In order to evaluate the equation, experiments for extracting procyanidins from grape seed with ethanol under different temperatures were carried out. The relationship between balance concentration of procyanidins and extraction temperature was obtained by fitting experimental data. Additionally, the important kinetic parameters were calculated using Arrhenius equation and the apparent activation energy for extraction process was calculated to be 2.08×104 J/mol. The results of verification experiment showed that the presented kinetic equation could describe the extraction process of grape seed procyanidins and the extraction process accorded with diffusion theories. This kinetic equation can provide a good theoretical base for further study on extraction of grape seed procyanidins.

Key words: grape seed, procyanidins, extraction, kinetics