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 ray 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 glucuronide 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.
通过高效
液相色谱法和紫外检测法对 25-羟基
维生素 D3 及其原形的体外
葡萄糖醛酸化进行了研究。虽然这两种底物在鳐鱼肝微粒体组分和
尿苷-5'-二
磷酸葡萄糖醛酸的存在下都会产生 3-和 25-
葡萄糖醛酸,但 25-羟基
维生素 D3 及其原形的主要产物分别是 3-和 25-
葡萄糖醛酸。后一种
葡萄糖醛酸是与叔羟基共轭的
葡萄糖醛酸。每种
葡萄糖醛酸苷都是通过其色谱行为与真实样品和使用常压
化学电离的
液相色谱/质谱法(LC/MS)获得的数据进行比较而确定的。