[Anti-oxidant activity and tissue accumulation of tocopherols from a new source].

Properties of a tocopherol concentrate, obtained from side products of cotton oil treatment containing alpha-tocopherol and other isomers of vitamin E and carotinoids at high concentrations, were studied in vivo and in vitro. The concentrate exhibited higher antioxidative activity in reaction with 2,2'-diphenyl-1-picrylhydrazine and inhibited lipid peroxidation in liver microsomes similarly to synthetic alpha-tocopherol. After addition of the concentrate to rat ration at a dose of 100 IU of vitamin E per 100 g of food the animals accumulated tocopherol from this source in the same way as it was observed for the synthetic preparation (liver, heart, lung) or at the higher level (kidney, brain, fatty tissue).

[Effects of different types of nutritional imbalance on lipid peroxidation and viscosity of membrane lipids].

For 90 days male August rats were kept on 5 diets: (I) balanced semisynthetic, (II) with amino acid unbalance, (III) with excess polyunsaturated fatty acids (PUFA), (IV) with vitamin E deficiency, and (V) polyunbalanced (amino acid unbalance, excess PUFA, vitamin E deficiency). In liver microsomes, the authors studied the kinetics of malonic dialdehyde accumulation in the course of NADPH-dependent lipid peroxidation (LP) and microviscosity of the lipid phase of microsomal membranes according to eximerization of the pyrene fluorescent hydrophobic probe. The microsomes of the animals fed diets I, III and IV showed on the average a 50 to 55% increase in the rate of MDA formation, whereas those of rats on diet V a 78% increase as compared with appropriate characteristics in the animals fed diet I.