Chinese Name: tannic acid
Synonyms: tannic acid; tannins; tannic acid (medicinal); twice acid; the Liquidambar wood; larch tannin extract; gallic tannin; tannic acid
English name: Glycerite
Synonyms: TERRI the PODS GALLOTANNIN; abcolgambier; abcolmimosame; abcolquebracho; abcolsumack19; abcoltannicacidtech the; abcoltannicacidusp / Kosher; acaciamollissimatannin
CAS No.: 1401-55-4
Molecular formula: C76H52O46
Molecular Weight: 1701.2
Chemical properties
Pale yellow amorphous powder or loose shiny scale-like or sponge-like solid, exposed to the air to black. Odorless, has a strong astringent taste. Soluble in water, ethanol, acetone, almost insoluble in benzene, chloroform, ether and petroleum ether.
Production methods
Tannin exists in a variety of trees (such as oak and sumac), the bark of fruit, these trees by the insect invasion and gall generated the main ingredient in a concentration of 50-70%. Gall crushed to remove dead insects and insect excreta and other impurities into the extraction of copper or wood tank with soft water extraction, vacuum concentration of the extract, add a small amount of ether, spray drying, ie light tanning acid. Medicinal tannic acid is concentrate extracted with diethyl ether, the leaching solution with weight sodium sulfite bleaching, recovery of ether, Serve medical tannins.
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