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Effect of sitosterol on autoxidation rate and product composition in a model lipid system
Author(s) -
Yanishlieva Nedyalka Vi.,
Schiller Helmut
Publication year - 1984
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740350215
Subject(s) - autoxidation , chemistry , peroxide , composition (language) , food science , chromatography , biochemistry , organic chemistry , philosophy , linguistics
The effect of 5% sitosterol on the autoxidation of tristearin at 120°C was investigated. It was found that sitosterol caused a two‐fold increase in the process rate; this effect was unchanged at peroxide concentrations of up to 350 mEq kg −‐1 . It was established that introduction of 5% sitosterol considerably increased the concentration of oxidised products in tristearin (from 0.5 to 6.5%) after oxidation at 120°C for 7h. The degree of oxidation of sitosterol in the system was found to be 56%. The structure and composition of oxidised products in the two lipid systems (tristearin, and tristearin+5% sitosterol) were determined. Conclusions were drawn concerning the effect of the lipid medium on the composition and structure of the products of sitosterol autoxidation.