Studies in vitamin A. 16. Spectroscopic properties of all-<i>trans</i>-vitamin A and vitamin A acetate. Analysis of liver oils

Abstract

is the only chemical difference we have observed in addition to the difference in speed of reaction with maleic anhydride. SUMMARY 1. Vitamin A ester concentrates can be enriched by chromatography on weakened alumina until practically free from glycerides, sterol esters and other substances.