ABSTRACT
Although the association of vitamin A potency with yellow color in foods was
known in the early 1900s, the exact relationship between the yellow color and
vitamin A was not known until Moore (1) demonstrated that the yellow-colored
orally fed carotene was converted to colorless vitamin A in rats. Elucidation of
the chemical structures of b-carotene and vitamin A by Karrer and his coworkers (2) confirmed the relationship.
