Method for preparing flavone from bamboo leaves

Abstract

The invention discloses a method for extracting flavone from bamboo leaves. The method includes steps of A, placing the bamboo leaves in a kettle, adding ethanol into the bamboo leaves in the kettle to ultrasonically extract the bamboo leaves, turning off a heating device, cooling and infusing soluble substances in the bamboo leaves; B, enabling solution in the reaction kettle to flow through a filter plate at the bottom of the reaction kettle, removing slag and then pouring the solution into a settling tank via a filter with multifilament filter cloth; C, allowing the filtered solution to stand so that the solution becomes clear and transparent; D, performing acid and alkali treatment for polar resin washing the polar resin by deionized water until the polar resin is free of ethanol, and filling the washed polar resin into a column; E, filling the transparent and clear solution into the column filled with the resin, and stopping filling the transparent and clear solution into the column when the column filled quantity reaches a set weight ratio of the resin to the filtered solution; F, washing the column filled with the resin and the solution by deionized water until liquid flowing out of the column is colorless, then eluting the column by edible ethanol and recycling the ethanol; and G, performing spray-drying for the solution in a spray tower to obtain the total flavone after the ethanol is recycled. The method is feasible, and is easy and convenient to operate, low in cost and good in effect, the flavone in the bamboo leaves is effectively separated from the bamboo leaves, and the content of the flavone is higher than 30%-50%.

Description

technical field [0001] The invention relates to the technical fields of food additives, medicine and health care products, and more specifically relates to a method for extracting flavonoids from bamboo leaves. Biological functions such as cerebrovascular, prevention and treatment of senile diseases, etc., are widely used. Background technique [0002] Bamboo leaf flavonoids are the main active ingredients in bamboo leaf extracts, which can remove active oxygen free radicals in the human body, prevent biofilm lipids from being oxidized by superoxide free radicals and hydroxyl free radicals, prevent vascular sclerosis, improve brain tissue nutrition, and improve Cardiovascular and brain nervous system functions, anti-cancer, anti-aging and other important physiological and pharmacological effects. The active ingredients of bamboo leaf flavonoids are mainly flavonoid glycosides and coumarin lactones, which can significantly reduce the blood triglyceride and blood total choles...

AI Technical Summary

Problems solved by technology

At present, there are many research reports on the extraction and purification methods of bamboo leaf flavonoids, most of which are extracted with water and different concentrations of ethanol. The applicant applied on January 10, 2011 (a method for extracting flavones from bamboo leaves) method), the patent application number is 201110003352.9, and the flavonoids extracted are poor in effect. The applicant has obtained through a large number of experiments and test analysis: the content of flavonoids extracted with 50%~60% alcohol is higher than that extracted with water or 70%~90% ethanol High, and 50%~60% ethanol extraction does not destroy the original fragrance of bamboo leaves, and can extract flavonoids from bamboo leaves at low cost