Effect of Dietary Selenium Dioxide, Cystine, Ethoxyquin and Vitamin E on Lipid Autoxidation in Chick Tissues

The ability of dictary selenium dioxide, L‐cystine, ethoxyquin (1,2‐dihydro‐6‐ethoxy‐2,2,4‐trimethylquinoline) and dl‐α‐tocopheryl acetate to inhibit autoxidation in incubated tissue homogenates was studied using the thiobarbituric acid test. Ethoxyquin (0.1 %) was as effective a tissue antioxidant as was dl‐α‐tocopheryl acetate (0.01 %). SeO2 (0.14, 0.46 and 1.4 ppm) significantly inhibited autoxidation in the liver, kidney and heart; the effect varied with different vitamin E‐free diets. L‐cystine (0.3 %) reduced autoxidation in muscle when fed in a casein‐gelatine diet.