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★ ★
小木虫(金币+0.5):给个红包，谢谢回帖交流
jiangchunyong(金币+1): 谢谢！ 2011-04-10 13:36:39
qinhy(EPI+1): 回答的很专业~~~欢迎常来哟~~ 2011-04-11 10:03:45
槲皮素（quercetin）结构如图所示。槲皮素也有其他名字，如橡黄素（Meletin）, 槲皮黄素（Sophretin）. 都是同一个物质。槲皮素的一些物理性质，来源，功效及应用如下所示：
Physical Property : yellow needle like crystal (dihydrate in dilute ethanol); dehydrate at 95-97 ; M.P. : 314 (dissociate); solubility : 1g in 290ml anhydrous ethanol, or 23ml of glacial acetic acid; yellow alkaline solution; almost insoluble in water; very bitter taste in ethanol; UV (EtOH, max) nm(log ) : 258(2.75), 375(2.75)。C 谱：13 CNMR(DMSO-d6) : 146.9(C2), 135.8(C3), 175.9(C4), 156.2(C5), 98.3(C6), 164.0(C7), 93.5(C8), 160.8(C9), 103.1(C10), 122.1(C1'), 115.2(C2'), 145.1(C3'), 147.7(C4'), 115.7(C5'), 120.1(C6') 。
Plant Source : Quercus iberica, skin and leaves ; Dysosma veitehii(Hemsl.et Vils.) Fu ; Hypericum ascyron L., full plant; Apocynum lancifolium Rus., leaves .
Functions and applications : fairly good expectorant and antitussive; some antiasthmatic effect; lowering of blood pressure, reducing the brittalness of capillary vessel, lowering blood lipid, dilation of coronary artery, increasing the flow in coronary artery. For the treatment of chronical bronchitis, accessory treatment of coronary heart diseases and hypertension . Toxicity : oral dose, mice : LD50 at 160mg/kg
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