Flavonoids as Chemotaxonomic Markers for Erythroxylum ulei
نویسنده
چکیده
Emanuel L. Johnson3 * and Walter F. Schmidtb a USDA ARS Weed Science Laboratory Bldg 001 Rm. 329 BARC-W Beltsville, MD 20705-2350 USA. Telefax: (301) 504-6491. E-mail: [email protected] b USDA Environmental Chemistry Laboratory, Bldg 12 Beltsville, MD 20705-2350 USA * Author for correspondence and reprint requests Z. Naturforsch. 54c, 881-888 (1999); received April 12/May 18, 1999 Erythroxylum ulei (E. ulei), Baptigenin, Genistein, Orobol, Isoflavone Leaf extracts of Erythroxylum ulei O. E. Schulz, produced six O-conjugated flavonoids. Three of the flavonoid aglycones were isoflavones, two were isoflavanones and the remainder a flavonol (quercetin). The major glycosides of these flavonols included monoand dirhamnosides, mono-glucosides and galactosides with either 3’, 4 ’, or 7 linkage or a combination thereof. The two isoflavanones, in addition to being glycosylated, possessed a methyl group at position 2 of the C-ring. These flavonoids may be used as chemotaxonomic markers for the taxon.
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