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The Mis-identification of the Major Antioxidant Flavonoids in Young Barley (Hordeum vulgare) Leaves

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The Mis-identification of the Major Antioxidant Flavonoids in Young Barley (Hordeum vulgare) Leaves

Kenneth R. Markham* and Kevin A. Mitchell

Industrial Research Ltd., P. O. Box 31310, Lower Hutt, New Zealand.

E-mail: k.markham@irl.cri.nz; k.mitchell@irl.cri.nz

* Author for correspondence and reprint requests

Z. Naturforsch.58 c, 53Ð56 (2003); received July 22/August 16, 2002

Several papers have appeared in the literature since 1992 which refer to a major “isoflavo- noid” antioxidant in young green barley leaves (Hordeum vulgare) as 2⬙-O-glucosylisovitexin.

In the present paper the original NMR data supporting this structural assignment are exam- ined and found to have been misinterpreted. HPLC and NMR data are used to prove that the major flavonoid antioxidants in young green barley leaves are in fact the flavone-C- glycosides, saponarin and lutonarin.

Key words: Hordeum vulgare, Flavonoid, Mis-identification

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