alexa Effect of dietary polyunsaturated saturated fatty acid ratio and dietary vitamin E on lipid peroxidation in the rat.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Buckingham KW

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Abstract The effects of the dietary ratio of polyunsaturated/saturated fatty acids (P/S) and dietary vitamin E on lipid peroxidation (LP) were examined to determine whether the vitamin E requirement is elevated by increased P/S in ratios comparable to those found in human diets. Twelve groups of male weanling rats (six/group) were fed purified diets containing 20\% fat with P/S ratios of 0.38, 0.82 or 2.30. At each P/S level, groups of rats received either 0, 10, 40 or 100 IU vitamin E/kg diet supplied as all-rac-alpha-tocopherol. After the diets were fed for 16 wk, in vivo LP was assessed by measuring pentane in expired breath. Pentane levels were significantly elevated in rats fed 0 IU vitamin E at all P/S levels. Both 40 and 100 IU vitamin E decreased pentane production to minimal levels for all P/S groups. Liver malondialdehyde levels and in vitro spontaneous red blood cell hemolysis results also indicated a significant effect of vitamin E in reducing in vitro LP, but no overall effect of P/S. Testicular and epididymal histology showed no effect of dietary P/S on the vitamin E requirement. These data demonstrated 40 IU vitamin E to be adequate for maximal inhibition of LP at the P/S levels tested and indicated that these levels of dietary P/S had no significant impact on the vitamin E requirement for the growing rat.
This article was published in J Nutr and referenced in Journal of Clinical & Cellular Immunology

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