Method for preparing total flavonoids in eucommia ulmoides leaves

Abstract

The present invention discloses a method for preparing total flavonoids in eucommia ulmoides leaves. The method comprises steps of eucommia ulmoides leaf crushing, cellulase assisted medium-temperature water extraction, conventional filtration, impurity removing with ultra-filtration membrane, nano-filtration concentration, separation and purification with macroporous resin, concentration and drying to prepare the total flavonoid powder. According to the present invention, the method adopts the cellulase assisted medium-temperature water extraction to extract the total flavonoids in the eucommia ulmoides leaves, wherein the extraction rate can achieve 95%, the water extraction temperature is low, and the extraction time is shortened; the ultra-filtration membrane is adopted to remove impurities from the extraction solution and separate other byproducts, wherein the membrane process is simple, the membrane flux can be stable for a long time, and characteristics of easy cleaning, long service life and easy industrialization achievement are provided; the nano-filtration membrane is adopted to concentrate the impurity-removed extraction solution so as to reduce the load of the follow-up process and prolong the service life of the resin; the COD value of the nano-filtration filtrate is less than or equal to 100, such that the nano-filtration filtrate can be reused for the production process, and almost no wastewater is discharged; and the macroporous resin is adopted so as to effectively purify the total flavonoids, wherein the purity of the total flavonoids in the prepared powder is more than 70%, and the extraction rate is more than 4%.

Description

technical field [0001] The invention relates to a method for preparing total flavonoids from leaves of Eucommia ulmoides, in particular to a method for preparing total flavonoids by adopting an enzymatic medium-warm water extraction, membrane separation technology and resin technology. Background technique [0002] Total flavonoids are an important biologically active substance, which has various pharmacological effects such as protecting the liver and gallbladder, antihypertensive, protecting nerve cells, anti-inflammation, anti-tumor, anti-thrombosis, and inhibiting osteoporosis. Wide range of applications. Total flavonoids mainly exist in natural plants such as eucommia and gardenia. Eucommia ulmoides is a unique economic tree species in my country, with a large distribution area and rich resources. The content of total flavonoids in Eucommia leaves is 2 to 5%, which is an ideal raw material for extracting total flavonoids. The extraction rate is not high in the existing...

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Problems solved by technology

[0004] In order to overcome the problems and shortcomings in the above-mentioned prior art, the present invention provides a method for preparing total flavonoids in Eucommia leaves, the method is to add cellulase and medium temperature water to the pulverized Eucommia leaves powder Extract the total flavonoids in Eucommia ulmoides leaves, then separate and purify the extracted total flavonoids through two-stage membrane separation technology combined with resin adsorption elution process, collect the ethanol eluate, concentrate under reduced pressure, and vacuum dry to obtain the total flavonoids of the product, which effectively solves the problem of The original problems of low extraction rate, large amount of waste water and low product purity in the production of total flavonoids

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