Method for preparing quercetin and rhamnose by using flos sophora

Abstract

The present invention belongs to the field of plant extraction, and specifically relates to a method for preparing quercetin by adopting flos sophora and producing rhamnose by using the quercetin preparation waste liquid. The technical problem solved by the method is to provide a completely new process for producing quercetin and rhamnose. The method specifically comprises the following steps: A, taking a proper amount of flos sophora, crushing, and adopting saturated and clarified lime water to extract rutin; B, adopting the rutin extracted in the step A to carry out hydrolysis to prepare quercetin; C, carrying out fermentation on the waste liquid from the step B to prepare a rhamnose crude product; and D, adopting methanol to separate glucose in the rhamnose crude product in the step C to prepare the rhamnose fine product. The method has characteristics of high yield, low cost, simple process, low pollution and low energy consumption, wherein the by-product rhamnose is produced so as to achieve a resource saving purpose.

Description

technical field [0001] The invention belongs to the field of plant extraction, and in particular relates to a method for preparing quercetin and rhamnose from Sophora japonica. Background technique [0002] Quercetin is a kind of flavonoids with various biological activities. Its chemical name is 3,3',4',5,7-pentahydroxyflavone. 15 h 10 o 7 , is yellow or yellow-green powder; odorless, slightly bitter taste, color deepens when exposed to air; almost insoluble in cold water, slightly soluble in boiling water, soluble in boiling ethanol, easily soluble in sodium hydroxide solution. The molecular structural formula is as follows. [0003] [0004] Studies have shown that quercetin has obvious medicinal effects, such as protecting against ischemia-reperfusion arrhythmia; lowering blood pressure, enhancing capillary resistance, reducing capillary lipids, lowering blood lipids, expanding coronary arteries, increasing coronary Blood flow and other effects; quercetin can comp...

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Problems solved by technology

[0007] At present, the production of quercetin in my country is mainly prepared by hydrolysis of rutin. The commonly used method is: add rutin to a dilute sulfuric acid solution and hydrolyze to produce quercetin, but this will produce acidic waste liquid and cause serious environmental pollution. , while a large amount of rhamnose contained in the waste liquid is not utilized, resulting in waste; the catalyst is changed to bismuth trifluoromethanesulfonate, which requires an organic solvent to dissolve and react, which will inevitably cause large energy consumption and high production costs; Enzymes are used as catalysts to produce quercetin, which requires high reaction conditions, difficult operation, high difficulty in industrial production, and no practical production significance

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