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Journal of Nutrition Vol. 40 No. 1 January 1950, pp. 159-168
Copyright © 1950 by American Society for Nutrition
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Effect of Xanthophyll on the Utilization of Carotene and Vitamin A by the Rat1

Barbara Kelley2 and Harry G. Day

Department of Chemistry, Indiana University, Bloomington

Large amounts of xanthophyll (lutein) administered with ß-carotene or vitamin A decrease the utilization of these substances for tissue storage of vitamin A in rats. They have no effect on the rate of disappearance of vitamin A already present in the tissues, indicating that the inhibitory action may occur in the alimentary tract. The inhibitory effect is not overcome by extra vitamin E administered as {alpha}-tocopheryl acetate.

The effect of the xanthophyll is not due to a specific impairment of the enzymatic mechanism for the conversion of carotene to vitamin A.

1 This work was supported by a grant from Standard Brands, Inc., and by the Research Funds of the Graduate School of Indiana University. Some of the data are taken from a thesis submitted to the Faculty of the Graduate School by Barbara Kelley in partial fulfillment of the requirements for the Ph.D. degree, 1948.

2 Present address: Department of Physiological Chemistry, University of Arkansas School of Medicine, Little Rock, Arkansas.

Manuscript received 15 September 1949.




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