as much structural information as possible. RESULTS Five novel photodegradation impurities of cilnidipine were separated and identified based on the high-resolution MS/MS data. Impurity III was synthesized and its structure was confirmed by (1) H-NMR and (13) C-NMR data. Two photodegradation pathways to produce different photodegradation impurities were also revealed in this study. CONCLUSIONS Among
理由通过
液相色谱/ Q-Orbitrap质谱法(LC / Q-Orbitrap MS)研究了西尼地平中光降解杂质的结构,以进一步完善药典的官方专着。研究了杂质的完整碎裂模式,以获取其结构信息。还探讨了西尼地平的两种光降解途径,以澄清西尼地平中杂质的来源。方法使用波士顿集团C18色谱柱(250 mm×4.6 mm,5μm)进行色谱分离。流动相由比例为75:25(v / v)的
乙腈/ H2 O组成。为了确定分子离子的m / z值和所有检测到的杂质的分子式,首先使用结合了Q-Orbitrap高分辨率质谱仪的Thermo LC系统在正离子和负离子模式下进行全扫描LC / MS。还对目标化合物进行了LC / MS / MS分析,以获得尽可能多的结构信息。结果根据高分辨率MS / MS数据分离并鉴定了5种新的西尼地平光降解杂质。合成了杂质III,并通过(1)1 H-NMR和(13)C-NMR数据证实了