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Recovery of anthocyanins from wine distillation wastes
Author(s) -
PERI G.,
BONINI V.
Publication year - 1976
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.1976.tb00724.x
Subject(s) - adsorption , chemistry , desorption , wine , chromatography , anthocyanin , distillation , freundlich equation , extraction (chemistry) , tannin , chemical engineering , organic chemistry , food science , engineering
Summary Adsorption of anthocyanins from red wine distillation wastes was carried out using an insoluble polyvinylpyrrolidone resin (Polyclar AT) and a nylon formulation. Comparison of adsorption data which were plotted according to the Freundlich isotherm show that Polyclar is a stronger adsorbent than nylon and that adsorption capacity is higher at lower temperature and concentration. Study of the kinetics shows that adsorption on Polyclar is almost immediate, while adsorption on nylon requires more than 24 hr to reach completion. This is probably due to the slow penetration of the solution into the finely porous structure of nylon. Different operating modes for desorption show that higher yields were obtained with multiple extraction from Polyclar and with batch countercurrent extraction from nylon. In any case desorption from nylon gives higher yields than from Polyclar. Qualitative and quantitative analyses show that both extracts contain, together with monomeric anthocyanins, considerable amounts of simple phenolics and, in the case of nylon, tannins and anthocyanin‐tannin copolymers.