Report of the Vitamin Assay Committee of the American Drug Manufacturers' Association—Twenty-Sixth Annual Meeting—May 1937

Physical and Chemical Determination of Vitamin A

“…value. This problem has been the subject of individual studies as well as collaborative effort both in this country and in England (1, 23,26,27). It is now ordinarily assumed that the vitamin A ultraviolet absorption follows Beer's law in concentrations suitable for spectrophotometric examination.…”