Tracking the deprotonation site of dehydroandrographolide with electrospray ionization mass spectrometry by deuteration.
Zhipeng HuoYu WangXinchi FengYi HeFeng QiuPublished in: Rapid communications in mass spectrometry : RCM (2021)
Deuteration of DA provided direct evidence of the deprotonation site of DA in the ESI source of the mass spectrometer, and the DFT method well predicted the gas-phase deprotonation site of DA.