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Journal of Lipid Research, Vol. 4, 330-336, July 1963
Copyright © 1963 by Lipid Research, Inc.

The absorption, storage, and metabolism of -tocopherol-C¹⁴ in the rat and chicken

S. Krishnamurthy and J. G. Bieri

Laboratory of Nutrition and Endocrinology, National Institute of Arthritis and Metabolic Diseases, National Institutes of Health, Bethesda 14, Maryland

-Tocopherol-C¹⁴ was administered orally to rats and chicks, and its distribution in the body and rate of excretion were determined at short intervals up to 24 hr and at longer intervals to 21 days. The radioactivity in all tissues was identified almost exclusively as unchanged -tocopherol except after 21 days, when trace amounts of unknown compounds appeared in chick liver and kidney. No evidence was obtained for a significant accumulation of tocopheryl quinone or other metabolic products in either rat or chick tissues. -Tocopherol in rat liver and intestinal mucosa cells was distributed about 50-60% in the mitochondria and 15-20% in the microsomal and supernatant fractions.

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