Determination of Acyl-, <i>O-</i>, and <i>N-</i>Glucuronide Using Chemical Derivatization Coupled with Liquid Chromatography–High-Resolution Mass Spectrometry
作者:Yukuang Guo、Abhi Shah、Eugene Oh、Swapan K. Chowdhury、Xiaochun Zhu
DOI:10.1124/dmd.122.000832
日期:2022.5
O-, or N-glucuronides of a molecule results in predictable and different numbers of derivatized functional groups, which can be determined by the mass shift using mass spectrometry. The following two reactions were applied to specifically derivatize carboxyl and hydroxyl groups that are present on the aglycone and its glucuronide metabolite: Carboxyl groups were activated by thionyl chloride followed
葡萄糖醛酸化是从体内消除小分子药物的最常见的 II 期代谢途径。然而,通过质谱法测定葡糖苷酸结构非常具有挑战性,因为它无法生成有关葡糖苷酸化位点的结构信息片段。在本文中,我们描述了一种使用化学衍生化来区分酰基、 O-和N-葡糖苷酸的简单方法。这个想法是酰基-、O-或N-的衍生化分子的葡糖苷酸会产生可预测的不同数量的衍生官能团,这可以通过质谱法的质量转移来确定。以下两个反应用于特异性衍生糖苷配基及其葡糖苷酸代谢物上的羧基和羟基:羧基被亚硫酰氯活化,然后用乙醇酯化。羟基基团通过 1-(三甲基甲硅烷基) 咪唑的甲硅烷基化衍生。每个衍生羧基和羟基的质量转移分别为 +28.031 Da 和 +72.040 Da。该方法已使用商业葡糖苷酸标准品成功验证,包括苯那普利酰基葡糖苷酸、雷洛昔芬O-葡糖苷酸和西洛多辛O-葡萄糖苷酸。此外,该方法还用于确定从肝微粒体孵育中分离出的葡萄糖苷酸代谢物的类型,其中阿维