The fragmentation behavior of six known flavonoids from Meconopsis Maxim were studied by electrospray ionization tandem mass spectrometry (ESI-MSn). Besides the structure of aglycones and hydroxyl group on it, the position of the sugar substitution also affected the fragmentation of the flavonoids. The diagnostic fragmentations of flavonoids and aglycones were obtained in the positive and negative ion ESI-MSn experiments, and the fragmentation pathways were discussed.
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