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Tea extract and preparation method thereof

A technology of tea extract and theanine, applied in the directions of tea extraction, food preparation, food science, etc., can solve the problems of neglect and achieve the effect of resource utilization, better efficacy and low energy consumption

Inactive Publication Date: 2009-06-24
健士星生物技术研发(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the quality of tea powder is controlled with the content of tea polyphenols and caffeine as indicators, ignoring the important functional component theanine in tea.

Method used

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  • Tea extract and preparation method thereof
  • Tea extract and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 50 kg of green tea leaves (theanine content is 1wt%) and 150 kg of green tea stems, crushed to a particle size of 0.1-0.3mm and placed in a 3-ton multi-functional extraction tank, add 2000 liters of pure water, stir and extract at 30°C After 30 minutes, filter; add 1000 liters of pure water to the filter residue, stir and extract at 30°C for 15 minutes, and filter. The two filtrates were combined, high-speed tubular centrifugation (14000 rpm), filtered, and the filtrate was filtered through a tubular PVDF tubular organic membrane (AQU250-B10, 0.22 μm). The filtrate is filtered through a PVDF ultrafiltration membrane with a molecular weight cut-off of 5000 Daltons, and the ultrafiltration membrane permeate is concentrated through a reverse PA osmosis membrane (DOW FILMTEC BW30LE-400) to obtain 80 liters of concentrated juice with a solid content of 30 wt%. Centrifugal filtration, organic membrane filtration, ultrafiltration membrane filtration and reverse osmosis membran...

Embodiment 2

[0051] 100 kg of green tea leaves (theanine content is 1wt%) and 100 kg of green tea stems, crushed to a particle size of 0.9-1.1 mm, placed in a 3-ton multifunctional extraction tank, added with 3000 liters of pure water, and stirred at 20 ° C After leaching for 60 minutes, filter; add 1,000 liters of pure water to the filter residue, leaching for half an hour at 20°C, and filter; the two filtrates are combined, filtered by high-speed tubular centrifugal (10,000 rpm), and the filtrate is passed through a polypropylene membrane (PP) Tubular organic membrane (Hefei Fengyun Technology Co., Ltd. HY-MF-10000, 0.1 μm) filtration, the filtrate flows through a chromatographic column filled with 100 kg of macroporous adsorption resin Diaion HP-20, and the effluent passes through a molecular weight cut-off range of 3000 It is filtered by the ultrafiltration membrane (PS) of polysulfone, and the permeate of the ultrafiltration membrane is then concentrated by a polypiperazine amide compo...

Embodiment 3

[0054] 300 kg of green tea stems (theanine content is 1.4wt%), crushed to a particle size of 1.0-3.0 mm, placed in a 3-ton multifunctional extraction tank, added 1500 liters of pure water, stirred and extracted at 70 ° C for 20 minutes Finally, filter; add 1500 liters of pure water to the filter residue, leaching for 10 minutes at 50°C, and filter; the two filtrates are combined and filtered by high-speed tubular centrifugation (12000 rpm), and the filtrate is passed through a PVDF tubular organic membrane (GE Desal MembraneAG 8080F ) filtration, the filtrate flows through the Rohm and Haas AMBELITE XAD-1600 chromatographic column filled with 300 kg of macroporous adsorption resin, and the effluent is filtered by a polysulfone ultrafiltration membrane (PS) with a molecular weight cut-off range of 1000 Daltons, and the ultrafiltration membrane The permeate is then concentrated through a PA reverse osmosis membrane (DOW FILMTECBW30LE-400) to obtain 120 liters of concentrated juic...

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Abstract

The invention discloses a tea extract containing theanine and catechin, in which, the theanine content is 3-4wt% of the tea extract by dry weight. The invention further discloses the preparation method: lixiviating the tea and / or crushed tea stems by the water of 0-70 degrees centigrade; filtering by centrifugation; filtering by organic membrane; and filtering by the Dalton ultra-filter with molecular weight retaining range of 1000-5000; concentrating by counter permeable membrane; where, all the filtering and concentrating by counter permeable membrane are under the temperature of 10-35 degrees centigrade; degerming, and obtaining concentrated juice state tea extract; and further drying to obtain tea powder state tea extract. The tea extract of the present invention has substantial health caring effects of enhancing immunity, soothing nerves, restoring consciousness and improving attentiveness and memory; and achieves the advantages of good cold water dissolvability, clear tea water,fresh taste and fragrant smell. The preparation of the invention can use tea stems as raw material, uses resource effectively, reduces cost, has simple processes, low energy consumption and no pollution.

Description

technical field [0001] The invention relates to a tea extract and a preparation method thereof. Background technique [0002] Tea leaves are rich in natural active ingredients such as theanine, tea polyphenols and caffeine. Each ingredient has its own unique properties and functions, which affect the taste and health care effect of tea soup. [0003] Theanine is an important flavor and functional ingredient in tea. It can produce body fluid and moisturize sweetness, and has the effects of lowering blood pressure, enhancing immunity, calming the mind, improving concentration and memory. At present, the known theanine products are mostly prepared by the following methods: (1) artificial organic synthesis; (2) microbial fermentation, which is costly and expensive; (3) extracting theanine from tea leaves, This method requires separation and purification by column chromatography, which is costly and has cumbersome steps. [0004] The content of tea polyphenols in tea leaves is...

Claims

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Application Information

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IPC IPC(8): A23F3/16A23L1/29A23L1/30A23L33/105
Inventor 蔡亚邹敏亮章志强温尧林朱吟吟
Owner 健士星生物技术研发(上海)有限公司
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