title: [Determination of vitamin D3 and its isomers in D3 resins and in mixtures with vitamin A acetate (author's transl)].
abstract: Vitamin D3 and its isomers, prepared from 7-dehydrocholesterol by photochemical reaction, can be separated and quantitatively determined by high-pressure liquid chromatography on aluminium oxide using chloroform as the eluting agent. The determination of small amounts of vitamin D3 in an excess of vitamin A acetate can be achieved by the same method.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002725:Chloroform; D002762:Cholecalciferol / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D007536:Isomerism; D010777:Photochemistry; D014801:Vitamin A / Q000032:analysis*
chemical_list: D014801:Vitamin A; D002762:Cholecalciferol; D002725:Chloroform
vernacular_title: Bestimmung von vitamin D3 und seinen fotoisomeren in D3-harzen sowie in mischungen mit vitamin A-acetat