The vitamin D3 and provitamin D3 content were analyzed by HPLC. The vitamin D3 content increased, and the provitamin D3 content decreased with 20W light at a distance of 50 cm. The conversion was at a maximum 15 hr after the start of irradiation and about 20% of the provitamin D3 ...
3) Vitamin D3 维生素D3 1. To Determine the Content of Vitamin D3 Injection with UV Spectrophotometry; 紫外分光光度法测定维生素D3注射液的含量 2. Sixty Holstein breed cows were randomly assigned to Vitamin D3 or control prepartum diet to investigate the effect of Vitamin D on blood ...
Process for the preparation of vitamin D3 and provitamin D3Separation of vitamin D3 or provitamin D3 from mixtures with other components, e.g. dehydrocholesterol, lumisterol and tachysterol, is effected by column chromatography.JOHANNSEN MONIKA...
ChemInform Abstract: IMPROVEMENT IN THE STAGES OF VITAMIN D3 SYNTHESIS. PREPARATION OF PROVITAMIN D3 - 7-DEHYDROCHOLESTEROLvitaminsDas Provitamin D3 (= 7-Dehydrocholesterin = 7-DHC) (II) wird aus Cholesterin (I) erhalten.doi:10.1002/chin.198039318...
Process for the preparation of vitamin D3 and provitamin D3Separation of vitamin D3 or provitamin D3 from mixtures with other components, e.g. dehydrocholesterol, lumisterol and tachysterol, is effected by column chromatography.JOHANNSEN, MONIKA...
[24R- 2H]-25-Hydroxyprovitamin D 3 has been synthesised, in order that the corresponding vitamin may be used to study the stereochemistry of hydroxylation in production of the metabolite 24R,25-dihydroxycholecalciferol. The stereospecific introduction of deuterium at C-24 is effected by means of ...