Technological method for extracting caffeine and tea polyphenol mixture from tea step by step

Abstract

The present invention discloses a method for extracting a mixture of tea polyphenol through soaking, wherein the mixture of tea polyphenol is extracted through the soaking method. The method comprises the following steps of (1) adding water or 30% of ethanol to the tea with the caffeine extracted according to a solid-to-liquid ratio of 1:5-8, soaking the mixture for the first time in the presence of normal temperature and microwave action; (2) adding water or 30% of ethanol to the filter residue after the first soaking and filtering operation according to a solid-to-liquid ratio of 1:3-5, soaking the mixture for 4 to 6 hours for the second time in the presence of a microwave with the heating temperature range thereof 65 to 80 DEG C; after 20-30 minutes since the completion of the microwave action, filtering, concentrating, and drying the mixture to obtain the mixture of tea polyphenol. The technical method for extracting the mixture of tea polyphenole from tea has no need of chemical solvent for separation, and can prepare pollution-free products as well as high-purity substances of catechin, tea polysaccharide and the like in the tea polyphenol mixture. The invention has the advantages of high extraction ratio, low cost, simple technology and easy massive preparation.

Description

technical field [0001] The invention relates to a method for extracting a mixture of caffeine and tea polyphenols, in particular to a process for step-by-step extraction of a mixture of caffeine and tea polyphenols from tea leaves. Background technique [0002] Tea polyphenols (Tea polphenols, TP) is a major natural compound in tea, and its content accounts for about 10%-35% of the total weight of dry matter in tea. Tea polyphenols are composed of catechins (flavanols), anthocyanins (anthocyanins and anthocyanins), anthocyanins (flavonoids and flavonols), fenac and concentrated fenac. The most valuable are catechins, accounting for about 60%-80% of the total amount of tea polyphenols. [0003] Studies have shown that tea polyphenols can scavenge free radicals in the human body and improve immunity. It has health care functions such as anti-oxidation, anti-aging, anti-radiation, and anti-cancer. It has been successfully used in medicine, health products, oil and food industr...

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods all have disadvantages in varying degrees: for example, the product of the solvent extraction method may have residual organic solvents; the ion precipitation method not only has a low yield, but also uses metal salts to precipitate and separate tea polyphenols, and the metal salts in the product will be separated. There are different degrees of residue; the resin adsorption method is cumbersome and difficult to produce on a large scale