Flavonol and dihydroflavonol glycosides of echinocereus triglochidiatus var. Gurneyi |
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Authors: | John M. Miller Bruce A. Bohmt |
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Affiliation: | 1. Botany Department, University of British Columbia, Vancouver, British Columbia V6T 1W5 Canada |
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Abstract: | Perianth parts, in particular, tepals of Echinocereus triglochidiatus var. gurneyi yielded a complex mixture of dihydroflavonols and dihydroflavonol 7-O-glucosides. Dihydroquercetin and its 7-O-glucoside were the predominant compounds while dihydrokaempferol and dihydromyricetin and their 7-O-glycosides were present in lesser amounts. Quercetin 7-O-glucoside was the principal flavonol glycoside: others present were quercetin and kaempferol 3-O-glucosides and 3-O-rhamnosylglucosides. The epidermis and spines yielded only traces of presumed flavonols as determined by two-dimensional TLC. No flavonoids were detected in the cortex tissue. This is the first report of dihydroflavonol derivatives from the Cactaceae and constitutes the first record of flavonoids from Echinocereus. |
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Keywords: | Cactaceae floral flavonoids dihydroflavonols flavonols chemotaxonomy. |
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