[Difference of alkaloid components between old stems and tender stems of Gelsemium elegans].

This study aimed to comprehensively assess the difference of alkaloid components between old stems and tender stems of Gelsemium elegans by using ultra high-performance liquid chromatography coupled with photo-diode array and quadrupole time-of-flight mass spectrometry( UPLC-Q-TOF/MS~E) and high-performance liquid chromatography coupled with UV detector( HPLC-UV). Firstly,the different components in old stems and tender stems were analyzed by UHPLC-Q-TOF/MSEcombined with principal component analysis( PCA) and orthogonal partial least squares discriminant analysis( OPLS-DA),respectively. As a result,17 major different components were found.