Structural characterisation of flavonoids and flavonoid‐O‐glycosides extracted from Genista tenera by fast‐atom bombardment tandem mass spectrometry

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Abstract
Genista tenera is a plant native to the Madeira Island (Portugal). From the ethanol extract of its powdered aerial parts, two flavones, three isoflavones and one 7‐O‐glucosyl isoflavone were isolated. A mass spectrometric study of these compounds was performed using liquid secondary ion mass spectrometry (LSIMS) in combination with high‐energy collision‐induced dissociation (CID) and tandem mass spectrometry (MS/MS). Characteristic fragmentation patterns were observed in all the investigated compounds; the loss of small neutral species from the protonated molecules was useful for identifying the presence of specific functional groups in the A‐ and B‐rings. In order to help to establish the proposed structures, NMR and UV studies were also performed. Copyright © 2001 John Wiley & Sons, Ltd.