Process for low-temperature extracting kudzu root flavanone and kudzu root starch from kudzu root

Abstract

The invention relates to a process for low-temperature extracting kudzu root flavanone and kudzu root starch from kudzu root. According to the process, kudzu or pueraria thomsonii benth developing for 2-5 years is washed, sliced, dried and crushed into pueraria powders, then edible alcohol with a certain concentration is added into the pueraria powders, the mixture is heated and extracted supersonically and subsequently filtered under heating to obtain pueraria extract and filter residues; and the pueraria extract is subjected to vacuum distillation and drying to obtain kudzu root flavanone extract, the filter residues are ground by adding water, screened and subjected to centrifugal separation, and precipates are dried and crushed to obtain kudzu root powder. The raw materials selected by the process have rich resources and high content of kudzu root flavanone, and suitable for scale production requirements; according to the process, the technology of firstly supersonically extracting kudzu root flavanone and subsequently preparing kudzu root powder by centrifugal separation improves the comprehensive utilization value of kudzu root; the process adopts edible alcohol and purified water as the extraction solvent, the recovery is convenient, and simultaneously nontoxic and harmful products are guaranteed; and the process is simple and has short production period, and can be used for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for extracting effective substances from plants, in particular to a method for extracting total flavonoids and starch of kudzu root from kudzu root. Background technique [0002] Pueraria lobata is the tuber of the leguminous plant Pueraria genus. It is rich in pueraria starch and flavonoids. It is not only a traditional Chinese medicine but also a health food. Pueraria is widely distributed in my country, with high yield and abundant resources, and Pueraria is a fast-growing plant with strong ability to adapt to the environment, and it is a plant resource that can be continuously developed and utilized. [0003] In recent years, the planting area of ​​kudzu root has developed rapidly, but the research and comprehensive utilization of kudzu root are still in the primary stage. The existing kudzu root processing technology either focuses on the extraction of kudzu root powder or the extraction of total flavonoids of kud...

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Problems solved by technology

[0004] Chinese patent application No. 021279661 "Method for Separating and Comprehensively Extracting Pueraria Starch and Flavonoids Using Metal Nano-membrane" invention patent provides a method for comprehensively extracting Pueraria powder and Pueraria flavonoids. The ultrafiltration membrane used in this method technology, the separation efficiency of kudzu powder is low, and a large amount of kudzu flavonoids cannot be extracted because they exist in the crude fiber of kudzu root epidermis, the extraction efficiency is poor, and it is not suitable for large-scale production

[0005] Chinese patent application number is 200910250993.7 "Technology for Efficiently Extracting Pueraria Starch and Pueraria Total Isoflavones", the method provided is to extract Pueraria starch first, and then extract Pueraria flavonoids from Pueraria slag, because Pueraria flavonoids are crushed and ground in Pueraria to prepare slurry During the process of feeding, it will be partially dissolved in water, and as the waste liquid flows out, the extraction rate of kudzu root flavonoids is reduced, and the overall benefit is not high

Chinese Patent Application No. 201010555037.2 "A Process for Simultaneous Production of Pueraria Starch and Pueraria Flavonoids" provides the method of first grinding to separate pueraria starch, and then using the pueraria residue to extract pueraria flavonoids, while increasing The process of extracting flavonoids, but the amount of waste water produced by the preparation of kudzu root starch is large and the content of kudzu root flavonoids is very low, the treatment is difficult, the cost is high, the extraction benefit is poor, and it is not suitable for industrial production

Chinese Patent Application No. 03124754.7 "Puderaria Simultaneous Extraction of Pueraria Starch, Pueraria Polysaccharides, and Pueraria Isoflavones" provides the method of pueraria puerarin grinding, enzymatic hydrolysis, and separation of pueraria starch, then concentrating the solution and ethanol precipitation to obtain pueraria polysaccharides, Puerarin isoflavones, but the refining process needs to add a lot of water, the solution concentrates for a long time, consumes a lot of energy, and puerarin is slightly soluble in water, the transfer rate of active ingredients is not high, and cannot meet the requirements of industrial production

This method has a high extraction rate of kudzu root flavonoids, but the extraction temperature reaches 80°C, and the local temperature will be higher through microwave heating, while the gelatinization temperature of kudzu root starch is 65-70°C, so the starch will be destroyed during the extraction of kudzu root total flavonoids structure, reduce the yield of starch, larger temperature difference in large-scale production, starch gelatinization will cause separation difficulties, low yield and other problems