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Let me tell you the difference between quercetin, quercetin dihydrate, quercetin anhydrous, and quercetin dihydro

Quercetin commonly referred to generally refers to quercetin dihydrate. As the name suggests, quercetin dihydrate contains two crystal waters in its structural formula. Quercetin anhydrous is obtained by removing the two crystal waters in the structural formula of quercetin dihydrate. Dihydroquercetin is the reduced form of quercetin, which is the product of hydrogenation of the double bonds at positions 2 and 3 in the parent nucleus of quercetin.

In terms of solubility, quercetin dihydrate and quercetin anhydrous are almost insoluble in water, and dihydroquercetin after hydrogenation of the double bond of quercetin is soluble in water.

As for plant sources, anhydrous quercetin is obtained from quercetin dihydrate when it becomes anhydrous at 95-97 degrees Celsius, and two crystal waters are removed, so they come from the same source, which is the flower bud of the legume Sophora japonica L; There are two sources of dihydroquercetin, one is obtained by hydrogenating the double bonds at positions 2 and 3 in the nucleus of quercetin, and the other is extracted from larch tree segments.

Quercetin dihydrate, quercetin anhydrous, and dihydroquercetin are all yellow powders, and the color of dihydroquercetin is slightly lighter.