Patent ID: 11878963
Assignee: HEFEI LIFEON PHARMACEUTICAL CO., LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A preparation method of dihydroquercetin, comprising the steps of:
adding quercetin dihydrate to a reaction solvent of water adjusted to be alkaline with an alkalizing reagent, heating and stirring to dissolve the quercetin dihydrate, and then adding thiourea dioxide under protection of an inert gas to perform a reduction reaction, to obtain an endpoint reduction reaction solution;
diluting the endpoint reduction reaction solution with water and cooling a resultant, and then acidizing, aging, and filtering the resultant to obtain a filtrate and a filter cake; and
extracting, washing, drying, and concentrating the filtrate to obtain a concentrated crude product, and repeatedly crystallizing the concentrated crude product to obtain the dihydroquercetin.