title: In vitro glucuronidation of 25-hydroxyvitamin D3 and its pro-form.
abstract: In vitro glucuronidation of 25-hydroxyvitamin D3 and its pro-form has been investigated by means of HPLC with UV detection. Although both substrates gave 3- and 25-glucuronides in the presence of the rat liver microsomal fraction and uridine-5'-diphosphoglucuronic acid, 25-hydroxyvitamin D3 and its pro-form yielded 3- and 25-glucuronide as the main product, respectively. The latter glucuronide is the one in which the tert-hydroxy group is conjugated. Each glucuromide was identified by its chromatographic behavior in comparison with an authentic sample and data obtained from liquid chromatography/mass spectrometry (LC/MS) using atmospheric pressure chemical ionization.
authors.affiliation: Faculty of Pharmaceutical Sciences, Kanazawa University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shimada
authors.forename: Y
authors.initials: Y
authors.lastname: Kamezawa
authors.forename: K
authors.initials: K
authors.lastname: Mitamura
mesh_terms: D000818:Animals; D002112:Calcifediol / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D002853:Chromatography, Liquid; D005260:Female; D005965:Glucuronates / Q000378:metabolism*; D013058:Mass Spectrometry; D008862:Microsomes, Liver / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D013056:Spectrophotometry, Ultraviolet; D013379:Substrate Specificity
chemical_list: D005965:Glucuronates; D002112:Calcifediol