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

Abstract

The oil used for solution of the provisional International Standard for vit. A may greatly influence its biological activity. Thus a solution of the Standard in peanut oil had 5-6 times the potency of solutions in hardened cotton-seed oil and ethyl laurate, though made of the same strength w/v; solutions of equal strength of the Standard in other vegetable oils had the same vit. A potency. The oil used to dilute it may have some influence on the vit. A potency of cod-liver oil also.