The influence of the solvent on the vitamin A activity of (<i>a</i>) carotene and (<i>b</i>) cod-liver oil

Abstract

Permanent Commission on Biological Standardisation of the Health Organisation of the League of Nations recommended [1931] the adoption of a particular sample of carotene as a provisional standard of reference for the estimation of vitamin A. This was to be prepared from the pooled contributions of five workers from different laboratories by the National Institute for Medical Research, London, where it would be kept and issued as required. The unit of vitamin A suggested was the vitamin A activity of ly (0O001 mg.) of this par- ticular sample of carotene.