Abstract
Thirty-seven flavonoids and a hydroxycynnamic acid have been characterized in barley leaves ( Hordeum vulgare L.) by liquid chromatography-UV diode-array coupled to ion trap mass spectrometry with electrospray ionisation interface (negative mode). Their structures have been determined by the study of the ion mass fragmentation which characterizes C-glycosyl flavones and O-glycosyl- C-glycosyl flavones, and differentiates di- O-glycosyl flavones from O-diglycosyl-flavones. The majority of them are described for the first time in barley. Saponarin (isovitexin-7- O-glucoside), lutonarin (isoorientin-7- O-glucoside) and isoscoparin-7- O-glucoside derivatives constitute the major part of the detected compounds. Some acylated derivatives are also described, namely, 7- O-[6-acyl]-glucoside and -7- O-[6-acyl]-glc-4′-glucoside of isovitexin, isoorientin and isoscoparin.
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