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Quercetin is a chemical found naturally in a number of foods (including apples, onions, teas, berries, and red wine) and in some herbs (such as ginkgo biloba and St. John's wort). Quercetin acts as an antioxidant, scavenging free radicals (chemical by-products known to harm cell membranes and damage DNA).
Rutin (quercetin rutinoside), like quercitrin, is a glycoside of the flavonoid quercetin. As such, the chemical structures of both are very similar, with the difference existing in the hydroxyl functional group.utin, also called rutoside, quercetin-3-O-rutinoside and sophorin, is the glycoside between the flavonol quercetin and the disaccharide rutinose (Î±-. -rhamnopyranosyl-(1â6))-Î²-. -glucopyranose). In the fava d'anta tree, the synthesis is done via a rutin synthase activity.