Author(s): Morrice PC, Wood SG, Duthie GG
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Abstract Quercetin is a plant polyphenol which is present in the diet as an aglycone and as sugar conjugates. Despite potent vasodilatory and antioxidant effects in vitro, destruction by intestinal organisms has been assumed to limit its nutritional relevance in the rat. However, we have refined extraction techniques using beta-glucuronidase followed by acid hydrolysis. Following this with HPLC methodology with post-column derivatisation, we have detected significant concentrations of quercetin and its metabolite, isorhamnetin, in tissues of rats maintained on quercetin-rich diets. Percentage recoveries are greater than 95\% and intra-batch variation does not exceed 7\% suggesting that the method may be useful in further studies of the biological role of this flavonoid.
This article was published in J Chromatogr B Biomed Sci Appl
and referenced in Journal of Bioequivalence & Bioavailability