The vitamin A content of “light white” casein

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Abstract
At 20% level "light white" casein contained enough vit. A. to promote slow growth in depleted rats. Hot alcohol extracts of the casein were colored yellow and gave blue colorations with the SbCl3 reagent. The approximate vit. A content of typical casein is 1 I.U. per g. Cold ether and ethylene dichloride extracts contained only a small fraction of the fat present in "light white" casein and gave no SbCl3 reaction. The vit. A activity of the casein was partially retained.