Liquid chromatographic/electrospray ionization mass spectrometric identification of the oxidation end-products of metformin in aqueous solutions
作者:F. Collin、H. Khoury、D. Bonnefont-Rousselot、P. Thérond、A. Legrand、D. Jore、M. Gardès-Albert
DOI:10.1002/jms.656
日期:2004.8
properties. HO*-induced oxidation of metformin was studied in aqueous solution, in both aerated and deaerated conditions. Gamma radiolysis of water was used to generate HO* free radicals, capable of initiating one-electron oxidation of metformin. Oxidation end-products were identified by direct infusion mass spectrometry (MS) and high-performance liquid chromatography/mass spectrometry (HPLC/MSn):
二甲双胍是一种抗高血压药,具有一定的抗氧化特性。在充气和脱气条件下,在水溶液中研究了HO *诱导的二甲双胍氧化。水的伽马射线分解被用来生成HO *自由基,该自由基能够引发二甲双胍的单电子氧化。通过直接注入质谱(MS)和高效液相色谱/质谱(HPLC / MSn)鉴定出氧化终产物:对于每种产物,结构鉴定均基于其质量(通过HPLC / MS确认的简单质谱) 。此外,碎裂谱图(MS2,MS3和MS4)以及氘-氢交换位点的确定提供了有价值的信息,可以完全鉴定某些最终产物。在低辐射剂量下,有四个产品被确定为主要产品,因为它们是HO *自由基直接攻击二甲双胍的结果。这些初级氧化终产物分别鉴定为二甲双胍的氢过氧化物,二甲双胍的共价二聚体,甲基双胍和2-氨基-4-亚氨基-5-甲基-1,3,5-三嗪。在高辐射剂量下,由于HO *诱导的主要终产物氧化而鉴定出其他七种产物为次要产物。提出了反应方案以解释结果。由HO