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Structural elucidation and gas-phase fragmentation of ten withanolides (steroidal lactones) were studied using a positive ion electrospray ionization quadropole time-of-flight mass spectrometry(More)
Rapid characterization of 23 pregnane-type steroidal alkaloids was studied using a positive ion electrospray ionization quadropole time-of-flight mass spectrometry (ESI-QqTOF-MS/MS) hybrid(More)
Electrospray ionization tandem mass spectrometry (ESI-MS/MS) was used to investigate the effect of different substitutions introduced during metabolism on fragmentation patterns of four anabolic(More)