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A technology of dihydroquercetin and quercetin is applied in the field of green preparation of dihydroquercetin, and can solve the problems of inability to realize industrialized production and the like
Inactive Publication Date: 2013-04-17
李玉山
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Synthetic methods mainly include catechins as raw materials, with a yield of about 5%, Mitsunobu reaction method, microbial fermentation method, and full synthesis starting from acetophenone and benzaldehyde, etc., but these cannot be industrialized. Semi-synthesis of dihydroquercetin from quercetin has industrial prospects
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[0015] Method 1: Close the mouth of the reaction kettle, pump 1400-1600Kg of purified water with accurate measurement into the reaction kettle, and then pump in 10-15Kg of concentrated sulfuric acid. Slowly add 200Kg of rutin crude product from the reaction kettle mouth, seal the reaction kettle mouth, start stirring, open the heat-carrying steam valve of the reaction kettle to heat, open the circulating condensed water, close the heat-carrying steam valve when the pressure gauge indication pressure on the reaction kettle reaches 0.15MPa, keep The pressure in the kettle is at 0.15MPa~0.20MPa for 2~4 hours. After 1 hour of reaction, take a sample from the sampling port for detection. After the reaction is complete, start to reduce the pressure, turn on the condensate water to cool, and the temperature reaches 50~60℃. Connect the plate and frame filter press and start Pressure filtration, after pressure filtration of the hydrolyzate, collect the filtrate to the sedimentation tank...
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Abstract
A green preparation technology of dihydroquercetin mainly comprises following steps: (1), preparing rough quercetin through hydrolysis of rutin NF11; (2), preparing fine quercetin by rough quercetin; (3), reacting fine quercetin under the catalysis of palladium-carbon catalyst by blowing hydrogen, or adding zinc powder or sodium borohydride to obtain dihydroquercetin reaction liquid; (4), preparing fine dihydroquercetin by dihydroquercetin reaction liquid; (5), extracting from acid liquor after rutin NF11 is hydrolyzed and filter pressed so as to obtain rhamnose. According to the invention, the rutin NF11 is taken as raw material to prepare dihydroquercetin, and meanwhile waste acid water is recycled, and the rhamnose is obtained through extraction, so that environmental pollution is avoided, the additional value of the technology is improved, and the whole process is green and environment-friendly.
Description
technical field [0001] The invention relates to a green preparation technology of dihydroquercetin. Background technique [0002] Dihydroquercetin, English name: taxifolin; (2r,3r)-3,3′,4′,5,7-pentahydroxyflavanone, (2r,3r)-Dihydroquercetin is the chemical name, molecular formula: C 15 h 12 o 7 , Alias: Taxifolin, Taxifolin, Taxifolin, (2R, 3R)-Dihydroquercetin, Molecular Weight: 304.25, CAS: 480-18-2. Dihydroquercetin is used as a raw material for high-grade food. It is a colorless needle crystal (50% ethanol), with a melting point of 208-210°C. It is easily soluble in ethanol, acetic acid, and boiling water, slightly soluble in cold water, and almost insoluble in benzene. Dihydroquercetin is recognized as one of the more effective vitamins for ensuring the healthy activities of human organs. It can promote the improvement of skin protection ability, avoid and reduce the damage of skin from internal and external toxins, radiation, microorganisms, viruses, and other compo...
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