Multistage Electrospray Ionization Mass Spectrometry Analysis of Alkaloids from Fructus Evodiae

The fragmentation behavior of five alkaloids isolated from Fructus Evodiae by ion trap electrospray ionization tandem mass spectrometry (ESI-MSⁿ) is investigated. Major and diagnostic fragment ions were identified and their origins are proposed. Their fragmentation patterns and products were useful for their characterization. Known or unknown alkaloids could be analyzed in the crude extracts of Fructus Evodiae using the summarized fragmentation rules.