Isolation and characterization of a degradation product in leflunomide and a validated selective stability-indicating HPLC-UV method for their quantification

作     者：Balraj Saini Gulshan Bansal 

作者机构：Department of Pharmaceutical Sciences and Drug ResearchPunjabi University 

出 版 物：《Journal of Pharmaceutical Analysis》 (药物分析学报（英文版）)

年 卷 期：2015年第5卷第3期

页      面：207-212页

学科分类：0710[理学-生物学] 1007[医学-药学(可授医学、理学学位)] 100704[医学-药物分析学] 1002[医学-临床医学] 0817[工学-化学工程与技术] 0703[理学-化学] 0702[理学-物理学] 10[医学] 

基　　金：University Grants Commission New Delhi India for providing financial assistance to carry out the study(F.No.:37-323/2009(SR)) 

主　　题：Leflunomide Characterization Forced degradation Degradation product HPLC-UV 

摘      要：Leflunomide （LLM） is subjected to forced degradation under conditions of hydrolysis, oxidation, dry heat, and photolysis as recommended by International Conference on Harmonization guideline Q1A（R2）. In total, four degradation products （I-IV） were formed under different conditions. Products I, II and IV were formed in alkaline hydrolytic, acidic hydrolytic and alkaline photolytic conditions. LLM and all degradation products were optimally resolved by gradient elution over a C18 column. The major degradation product （IV） formed in hydrolytic alkaline conditions was isolated through column chromatography. Based on its IH NMR, IR and mass spectral data, it was characterized as a British Pharmacopoeial impurity B. The HPLC method was found to be linear, accurate, precise, sensitive, specific, rugged and robust for quantification of LLM as well as product IV. Finally, the method was applied to stability testing of the commercially available LLM tablets.