Quercetin is a flavonoid compound found in the bark and rinds of many plants and fruits.1 The estimated human normal dietary intake of quercetin, primarily as glycosides, is 0.1-0.2 mg/kg.2 Quercetin is present in much greater amounts in nutritional supplements. Quercetin is carcinogenic in male rats, inducing renal adenomas when fed at 2,000 mg/kg.3 Quercetin has been reported to inhibit phosphodiesterases of both cGMP and cAMP.4,5
1
Gschwendt, M., Horn, F., Kittstein, W., et al. Inhibition of the calcium- and phospholipid-dependent protein kinase activity from mouse brain cytosol by quercetin.. Biochem Biophys Res Commun117(2)444-447(1983).
2
Young, J.F., Nielsen, S.E., Haraldsdottir, J., et al. Effect of fruit juice intake on urinary quercetin excretion and biomarkers of antioxidative status.. Am J Clin Nutr69(1)87-94(1999).
3
. Toxicology and carcinogenesis studies of quercetin in F344 rats. National Toxicology Program1-171(1992 Sep 1).
4
Ruckstuhl, M., Beretz, A., and Anton, R. Flavonoids are selective cyclic GMP phosphodiesterase inhibitors.. Biochem Pharmacol28(4)535-538(1979).
5
Lang, D.R., and Racker, E. Effect of quercetin and F1 inhibitor on mitochondrial ATPase and energy-linked reactions in submitochondrial particles.. Biochim Biophys Acta333(2)180-186(1974).
Room temperature
in continental US; may vary elsewhere
SMILES
Copy SMILES to clipboard
Oc1cc(O)c2c(c1)oc(c1ccc(O)c(O)c1)c(O)c2=O
Background Reading
Young, J.F., Nielsen, S.E., Haraldsdottir, J., et al. Effect of fruit juice intake on urinary quercetin excretion and biomarkers of antioxidative status.. Am J Clin Nutr69(1)87-94(1999).
Ruckstuhl, M., Beretz, A., and Anton, R. Flavonoids are selective cyclic GMP phosphodiesterase inhibitors.. Biochem Pharmacol28(4)535-538(1979).
Gschwendt, M., Horn, F., Kittstein, W., et al. Inhibition of the calcium- and phospholipid-dependent protein kinase activity from mouse brain cytosol by quercetin.. Biochem Biophys Res Commun117(2)444-447(1983).
. Toxicology and carcinogenesis studies of quercetin in F344 rats. National Toxicology Program1-171(1992 Sep 1).
Lang, D.R., and Racker, E. Effect of quercetin and F1 inhibitor on mitochondrial ATPase and energy-linked reactions in submitochondrial particles.. Biochim Biophys Acta333(2)180-186(1974).