Quercetin
[Synonyms]: quercetin, quercetin Flavin, Meletin, Sophretin.
[Chemical name]: 4H-1-Benzopyran-4-one, 2 - (3,4-dihydroxyphenyl) -3,5,7-trihydroxy -
[Molecular formula and Molecular weight]: C15H10O7: 302.23
[Physical Properties]: 2 hydrate as a yellow needle-like crystal (dilute ethanol), in the 95-97 ° C as anhydrous material, melting point 314 ° C (decomposition). 1g dissolved in 290ml anhydrous ethanol, 23ml boiling ethanol, soluble in glacial acetic acid, alkaline aqueous solution yellow, almost insoluble in water, ethanol solution taste bitter.
[Plant Source]: Iberian oak Fagaceae Quercus iberica skin and leaves, Berberidaceae plant red Dysosma Dysosma veitchii (Hemsl.et Wils.) Fu, Hypericum plant red Eclipta (Hunan forsythia) Hypericum ascyron L. whole plant, plant kenaf Apocynaceae Apocynum lancifolium Rus. leaves
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