Analysis of sesquiterpene lactones in Eupatorium lindleyanum by HPLC-PDA-ESI-MS/MS

Introduction - The aerial part Eupatorium lindleyanum is commonly used as an antipyretic and detoxicant clinically in traditional Chinese medicine. Our previous research showed that germacrane sesquiterpene lactones were its main active constituents, so the development of rapid and accurate methods for the identification of the sesquiterpene lactones is of great significance. Objective - To develop an HPLC-PDA-ESI-MS/MS method capable for simple and rapid analysis of germacrane sesquiterpene lactones in the aerial part E. lindleyanum. Methodology - High-performance liquid chromatography-photodiode array detection-electrospray ionization-tandem mass spectrometry was used to analyze germacrane sesquiterpene lactones of Eupatorium lindleyanum. The fragmentation behavior of germacrane sesquiterpene lactones in a Micromass Q/TOF Mass Spectrometer was discussed, and 9 germacrane sesquiterpene lactones were identified by comparison of their characteristic data of HPLC and MS analyses with those obtained from reference compounds. Results - The investigated germacrane sesquiterpene lactones were identified as eupalinolides C (1), 3 beta-acetoxy-8 beta-(4'-hydroxy-tigloyloxy)-14-hydroxy-costunolide (2), eupalinolides A (3), eupalinolides B (4), eupalinolides E (5), 3 beta-acetoxy-8 beta-(4'-oxo-tigloyloxy)-14-hydroxy-heliangolide (6), 3 beta-acetoxy-8 beta-(4'-oxo- tigloyloxy)-14-hydroxy-costunolide (7), hiyodorilactone B (8), and 3 beta-acetoxy-8 beta-(4'-hydroxy-tigloyloxy)-costunolide (9). Compounds 6,7 and 9 were reported for the first time. Conclusion - HPLC-PDA-ESI-MS/MS provides a new powerful approach to identify germacrane sesquiterpene lactones in E. lindleyanum rapidly and accurately. Copyright (C) 2009 John Wiley & Sons, Ltd.