Steroidal glycosides from Dregea sinensis var. corrugata screened by liquid chromatography-electrospray ionization tandem mass spectrometry.

The MS fragmentation behavior of the C-21 steroidal glycosides from Dregea sinensis var. corrugata was investigated by positive and negative ion electrospray ionization MS using a multistage tandem mass spectrometer equipped with an ion trap analyzer. The mass fragmentation patterns of steroidal glycosides substituted with an orthoacetate group were summarized, and the fragmentation patterns were applied to the online structure identification of the steroidal glycosides in the extract.

[Studies on chemical constituents from stems and leaves of Adenanthera pavanina].

Objective: To study the chemical constituents of Adenanthera pavanina.

Method: Various chromatographic techniques were used to isolate and purify the constituents. The structures were elucidated by chemical evidence and spectroscopic methods.