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Quercetin is the aglycone form of a number of other flavonoid glycosides, such as rutin (also known as quercetin-3-O-rutinoside) and quercitrin, found in citrus fruit, buckwheat, and onions. [2] Quercetin forms the glycosides quercitrin and rutin together with rhamnose and rutinose , respectively.
The principal phytochemicals are polyphenols in the leaves, stems, and roots of some Scutellaria species, including baicalin, baicalein, wogonin, and oroxylin A. [7] [8] [9] Other constituents include lateriflorin, melatonin, serotonin, viscidulin III-2’-O-glucoside, Chyrin-6-C-ara-glc, trans-verbascoside, viscidulin, trans-martynoside, oroxylin A-7-O-glc, wogonoside, chitin, and scutellarin ...
Quercitrin is a glycoside formed from the flavonoid quercetin and the deoxy sugar rhamnose. Austrian chemist Heinrich Hlasiwetz (1825-1875) is remembered for his chemical analysis of quercitrin. It has also been investigated as a potential dietary supplement.
Quercetin 3-sulfate is a plasma human metabolite of quercetin. [ 1 ] [ 2 ] [ 3 ] It is the sulfate conjugate of quercetin . Quercetin-3-sulfate 3'-sulfotransferase is an enzyme that uses 3'-phosphoadenylyl sulfate and quercetin 3-sulfate to produce adenosine 3',5'-bisphosphate and quercetin 3,3'-bissulfate .
The latter substance is a glycoside, and in aqueous solution under the influence of mineral acids it yields quercetin, C 15 H 10 O 7, which is precipitated, and the methyl-pentose rhamnose. [ 2 ] Quercetin is a crystalline powder of a brilliant citron yellow color, entirely insoluble in cold water and dissolving only sparingly in hot water, but ...
Rutin (rutoside, quercetin-3-O-rutinoside or sophorin) is the glycoside combining the flavonol quercetin and the disaccharide rutinose (α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranose). It is a flavonoid glycoside found in a wide variety of plants, including citrus .
Thus, the two substrates of this enzyme are quercetin and O 2, whereas its three products are 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate, CO, and H +. This enzyme belongs to the family of oxidoreductases , specifically those acting on single donors with O 2 as oxidant and incorporation of two atoms of oxygen into the substrate (oxygenases).
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