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Liquid chromatography/mass spectrometric studies on atorvastatin and its stress degradation products
Author(s) -
Shah Ravi P.,
Kumar Vijay,
Singh Saranjit
Publication year - 2008
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3403
Subject(s) - chemistry , lactone , hydrolysis , chromatography , diastereomer , degradation (telecommunications) , liquid chromatography–mass spectrometry , fragmentation (computing) , mass spectrometry , organic chemistry , telecommunications , computer science , operating system
A comprehensive mass fragmentation pathway of atorvastatin, which has not been reported so far, was established by subjecting the drug to multi‐stage mass spectrometric (MS n ) studies. It was used along with liquid chromatography/mass spectrometric (LC/MS) and liquid chromatography/time‐of‐flight mass spectrometric (LC/TOFMS) analyses to identify the drug degradation products formed under stress conditions of hydrolysis, oxidation and photolysis. Other than lactone, which is a reported hydrolysis product, six unknown hydrolytic products could be identified, viz ., dehydrated drug, dehydrated drug lactone, and diastereomers of the drug, drug lactone, dehydrated drug, and dehydrated drug lactone. Among the two products separated under oxidative conditions, one was lactone, again formed as a result of drug hydrolysis in an acidic environment of peroxide solution. The other was similar to a reported oxidative product. Under photolytic conditions in solution, one new product could be identified, while most of the others matched with those known from the literature. Hence overall a more complete degradation pathway of the drug was established than known at present, by using a stress testing approach and employing LC/MS techniques. Copyright © 2008 John Wiley & Sons, Ltd.