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Absorption, excretion and metabolite profiling of methyl-, glucuronyl-, glucosyl- and sulpho-conjugates of quercetin in human plasma and urine after ingestion of onions

Published online by Cambridge University Press:  08 March 2007

William Mullen ,
Christine A. Edwards  and
Alan Crozier
William Mullen*
Affiliation:
Plant Products and Human Nutrition Group, Graham Kerr Building, Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of GlasgowGlasgow G12 8QQ, UK
Christine A. Edwards
Affiliation:
Human Nutrition Section, University of GlasgowDivision of Developmental Medicine, Yorkhill Hospital, Glasgow G3 8SJUK
Alan Crozier
Affiliation:
Plant Products and Human Nutrition Group, Graham Kerr Building, Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of GlasgowGlasgow G12 8QQ, UK
*
*Corresponding author: Professor Alan Crozier, fax +44 (0)141 330 5364, email a.crozier@bio.gla.ac.uk
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Abstract

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It is essential to have a thorough knowledge of the bioavailability and metabolism of dietary flavonols to understand their role in disease prevention. Lightly fried onions containing 275μmol flavonols, principally quercetin-4′-glucoside and quercetin-3,4′-diglucoside, were fed to healthy human volunteers and plasma and urine were collected over a 24h period. Samples were analysed by HPLC with diode array and tandem mass spectrometric detection. Five flavonol metabolites, quercetin-3′-sulphate, quercetin-3-glucuronide, isorhamnetin-3-glucuronide, a quercetin diglucuronide and a quercetin glucuronide sulphate, were detected in plasma in quantifiable amounts with trace quantities of six additional quercetin metabolites. Sub-micromolar peak plasma concentrations (cmax) of quercetin-3′-sulphate, quercetin-3-glucuronide, isorhamnetin-3-glucuronide and quercetin diglucuronide were observed 0.6–0.8h after ingestion. In contrast, the cmax of quercetin glucuronide sulphate was 2.5h. The elimination half-lives (t1/2) of quercetin-3′-sulphate, quercetin-3-glucuronide and quercetin diglucuronide were 1.71, 2.33 and 1.76h respectively, while the t1/2 of isorhamnetin-3-glucuronide was 5.34h and that of quercetin glucuronide sulphate was 4.54h. The profile of metabolites excreted in urine was markedly different to that of plasma with many of the major urinary components, including quercetin-3′-glucuronide, two quercetin glucoside sulphates and a methylquercetin diglucuronide, absent or present in only trace amounts in the bloodstream indicative of substantial phase II metabolism. Total urinary excretion of quercetin metabolites was 12·9μmol, corresponding to 4·7% of intake. If these samples had been subjected to hydrolysis, as in many previous studies, only quercetin and isorhamnetin would have been detected and quantified. The bioactivity of these metabolites should be considered.

Keywords

FlavonolsQuercetin glucosidesAbsorptionMetabolismExcretionManHPLC–MS2
Type
Research Article
Information
British Journal of Nutrition , Volume 96 , Issue 1 , January 2006 , pp. 107 - 116
Copyright
Copyright © The Nutrition Society 2006

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