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黄酮类化合物按其化学结构,约有20种,如黄酮、黄酮醇、双黄酮、查耳酮、噢哢、呋喃黄酮、苯色酮、黄烷等等.中草药中,黄酮类化合物绝大多数与糖结合成,也有与鞣质结合,或游离存在.它们的溶解度与苷分子中糖分子的数目以及羟基位置和数目有关.一般地说,黄酮苷类易溶于热水、甲醇、乙醇、乙酸乙脂和稀碱溶液等,难溶于冷水、乙醚、氯仿和苯等.游离的苷元溶于乙醚、氯仿、乙酸乙脂和稀碱溶液中,难溶于水.
Flavonoids, according to their chemical structure, are about 20 species, such as flavonoids, flavonols, biflavonoids, chalcone, quinones, furan flavones, phenyl chrome ketones, flavans, etc. In Chinese herbal medicines, the vast majority of flavonoids In combination with sugar, it is also associated with tannins or free. Their solubility is related to the number of sugar molecules in the glycoside molecule and the position and number of hydroxyl groups. In general, flavonoid glycosides are easily soluble in hot water, methanol, ethanol, Ethyl acetate and dilute alkali solution, insoluble in cold water, ether, chloroform and benzene, etc. Free aglycones soluble in ether, chloroform, ethyl acetate and dilute alkali solution, insoluble in water.