The State of Vitamin A in the Liver of the Rat after Feeding Various Forms of the Vitamin

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Abstract
Vitamin A, fed to rats in the following forms— U.S.P. reference oil Vitamin A caproate Distilled ester concentrate Vitamin A stearate Vitamin A alcohol Beta carotene was recovered in the livers as the esters, the percentage recovery being in the order of the substances listed. Fifty-five and six-tenths per cent of the vitamin fed as U.S.P. reference oil was recovered, as against 39.3% recovery from that fed as alcohol and 9.7% recovery from beta carotene. A small amount of the vitamin alcohol was always present, the significance of which is at present not known. The type of ester in each case was similar, which suggests a selective utilization of fatty acids by the rat for the purpose of esterifying the vitamin.

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