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Glutathione Peroxidase Activity in Intestinal and Liver Tissues of Rats Fed Various Levels of Selenium, Sulfur, and -Tocopherol^1,2,

University of Florida, Gainesville, Florida 32611

The effects of various levels of selenium, -tocopherol and sulfur on glutathione peroxidase (GSH-Px) activity in intestinal and liver tissues were determined in male rats fed corn-soybean or Torula yeast diets. Rats fed corn-soybean diets had greater GSH-Px activity in small intestine, colon and liver tissues, catalase activity and selenium in the liver, and body weight gains than those fed Torula yeast diets. GSH-Px activity in the small intestine, colon, and liver tissues as well as concentration of selenium in the liver increased with increasing levels of selenium in Torula yeast diets but not with corn-soybean diets. Tocopherol supplementation had no significant effect on GSH-Px activity in rats fed Torula yeast or corn-soybean diets supplemented with selenium. Supplemental sulfur decreased GSH-Px activity in the small intestine tissues and increased activity in colon tissues.

KEY WORDS: • glutathione peroxidase • sulfur • selenium • small intestine • colon • liver

¹ Published as an Institute of Food and Agricultural Science journal article No. 1090.

² Supported in part by a grant from the Florida Department of Citrus, Lakeland, Florida.

³ Present address: Department of Nutrition and Dietetics, The University of Texas, P. O. Box 20036, Houston, Texas 77025.

⁴ Department of Animal Science (send proof here).

⁵ Department of Medicine.

Manuscript received 27 March 1978.