抄録
Various procedures of vitamin A determination in the United States of Pharmacopeia XVI (=British Pharmacopeia, Addendum 1960), Japan Pharmacopeia VII, and Deutches Arzneibuch 3 Nachtrag were applied to mixtures containing pure all-trans vitamin A and pure neovitamin A without chromatographic separation. When these estimated values were compared with the calculated biological potencies by setting the biological potency of all-trans vitamin A as 100 and neovitamin A as 75.3,the procedure of USP XVI was found to give the most close values. Therefore, the procedure of USP XVI is the most desirable.
