Tea polyphenols extracting process

An extraction method and technology of tea polyphenols, applied in the field of tea polyphenols extraction, can solve the problems of lack of maturity and reliability of fluid extraction method, cumbersome process of resin adsorption method, low yield of ion precipitation method, etc., and achieve reduction in dosage , Low caffeine content, high purity effect

Inactive Publication Date: 2005-07-06
RED RIVER TANGREN BIOLOGY DEV
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Problems solved by technology

The above methods currently have various shortcomings, such as: the ion precipitation method has a low yield and the corresponding cost is high; the product of the solvent extraction method has residues of organic solvents; the resin adsorption method is cumbersome and costly, and it is difficult to produce on a large scale ; Supercritical CO 2 The fluid extraction method currently lacks the maturity and reliability of the technology and needs further in-depth research

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  • Tea polyphenols extracting process
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Embodiment Construction

[0015] figure 1 In the process, weigh 2000 grams of medium and low-grade green tea or tea powder, add 20 liters of hot water at 90°C, stir and extract at a constant temperature for 30 minutes, filter to remove tea dregs, and cool the tea water to below 40°C. Repeat the leaching once, combine the two leaching teas and filter through a 120-mesh filter cloth to obtain 36.2 liters of tea, remove pectin with an ultrafiltration membrane with a cut-off molecular weight of 50,000 to 80,000, and dehydrate and concentrate with a reverse osmosis membrane with a cut-off molecular weight of 500,000 to 1,000,000 Obtain 3.6 liters of strong tea water, get 320.8 grams of powdered tea extract through spray drying, put the powdered tea extract into a supercritical extractor with a volume of 5 liters and pass into aqueous CO 2 While raising the temperature to 50°C, pressurize to 25-30Mpa, extract statically for 60 minutes, and open the pressure reducing valve to make the CO2 containing caffeine ...

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Abstract

The tea polyphenol extracting process includes the steps of tea extraction, straining, ultrafiltering to eliminate pectine, nano filtering or reverse penetration to dewater and concentrate, vacuum concentration, spray drying to obtain tea extractive powder, supercritical CO2 fluid processing to eliminate cofeine and extract tea polyphenol, deionized water dissolution of tea extractive, extractionwith ethyl acetate, and spray drying to eliminate solvent and obtaining high purity tea polyphenol product, which has purity over 98 %, extracting rate over 10 % and caffeine content less than 0.1 %. The tea polyphenol has powerful antioxidant property, and is especially suitable for application in food, health article and medicine. The present invention provides a way for the comprehensive utilization of low grade tea.

Description

technical field [0001] The invention relates to a method for extracting tea polyphenols. Background technique [0002] As we all know, tea polyphenols (GTP), mainly composed of catechins in tea, have the functions of anti-oxidation, anti-aging, anti-radiation, anti-tumor, sterilization and improvement of human immunity. It has been widely used in medicine, health care and Food Industry. According to public patent reports at home and abroad, the methods for extracting tea polyphenols from tea include: ion precipitation, solvent extraction, resin adsorption and supercritical carbon dioxide fluid extraction. The above methods currently have various shortcomings, such as: the ion precipitation method has a low yield and the corresponding cost is high; the product of the solvent extraction method has residues of organic solvents; the resin adsorption method is cumbersome and costly, and it is difficult to produce on a large scale ; Supercritical CO 2 The fluid extraction metho...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D311/62
CPCY02P20/54
Inventor 黄明张松波张守政冯政史绍林付金祥何跃飞高毅唐庆龙
Owner RED RIVER TANGREN BIOLOGY DEV
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