Alterations in concentration of free fatty acids, free cholesterol, native antioxidants as well as in the antioxidative activity were studied in lipids of mice liver tissue and small intestinal mucosa. The intensity of free radical reactions in lipids of animal tissues was affected directly by administration of synthetic inhibitors of the reactions. The inverse correlation was observed between the alteration in concentrations of native antioxidants and free fatty acids as well as between the antioxidative activity of lipids and amount of free cholesterol in them. Free fatty acids appears to be the constant participants in the system of free radical oxidation of lipids, while cholesterol can center the system under distinct level of these reactions intensity.
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