Identification, isolation and characterization of potential degradation products in pioglitazone hydrochloride drug substance
作者:Ramulu、Thilak Kumar、Radha Krishna、Vasudev、Kaviraj、Rao、Someswara Rao
DOI:10.1691/ph.2010.9239
日期:——
During stress degradation studies of pioglitazone hydrochloride, one major unknown oxidative degradation impurity and two major unknown base degradation impurities were identified by LC-MS. These impurities were isolated using preparative liquid chromatography. Based on the spectral data (1H NMR, 13C NMR, MS and IR), oxidative degradation impurity, base degradation impurity-1 and base degradation impurity-2 were characterized as pioglitazone N-oxide, 3-(4-(2-(5-ethylpyridine-2yl) ethoxy) phenyl)-2-mercaptopropanoic acid and 2-(1-carboxy-2-4-[2-(5-ethylpyridine-2yl)-ethoxy] phenyl}-ethyl disulfanyl)-3-4-[2-(5-ethylpyridine-2yl)-ethoxy] phenyl propanoicacid, respectively. The formation and mechanism of these impurities were discussed and presented.
在盐酸吡格列酮的应力降解研究中,通过液相色谱-质谱(LC-MS)发现了一种主要的未知氧化降解杂质和两种主要的未知碱降解杂质。使用制备液相色谱法分离了这些杂质。根据光谱数据(1H NMR、13C NMR、MS 和 IR),氧化降解杂质、碱基降解杂质-1 和碱基降解杂质-2 被鉴定为吡格列酮 N-氧化物、3-(4-(2-(5-乙基吡啶-2-基)乙氧基)苯基)-2-巯基丙酸和 2-(1-羧基-2-4-[2-(5-乙基吡啶-2-基)-乙氧基]苯基}-乙基二硫酰基)-3-4-[2-(5-乙基吡啶-2-基)-乙氧基]苯基丙酸。讨论并介绍了这些杂质的形成和机理。