Method for extracting tea polysaccharides and tea polyphenol from coarse old green tea

A technology of tea polysaccharides and tea polyphenols, applied in the fields of anti-toxic agents, metabolic diseases, organic chemistry, etc., can solve the problems of low yield, environmental pollution, etc., achieve high yield, avoid a lot of waste, and enhance the effect of activity

Active Publication Date: 2009-09-02
江苏荣诚农业科技发展有限公司
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Problems solved by technology

[0006] At present, the method of water extraction, ethanol precipitation or solvent extraction is usually used to extract and separate tea polysaccharides and tea polyphenols in crude old tea. Due to the low yield of conventional water extraction and ethanol precipitation extraction methods, the yield of tea polysaccharides is only 2%~ 5%, the yield of tea polyphenols is only 15% to 20%, and the solvent extraction method will cause environmental pollution due to the use of a large amount of organic solvents

Method used

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  • Method for extracting tea polysaccharides and tea polyphenol from coarse old green tea
  • Method for extracting tea polysaccharides and tea polyphenol from coarse old green tea

Examples

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Effect test

Embodiment 1

[0020] 1) adding 4% water by mass to the thick old green tea, and then extruding with a single-screw extruder at a temperature of 130° C. to pre-treat the raw materials;

[0021] 2) Add the above-mentioned crude old green tea that has been squeezed into deionized water, the mass ratio of the thick old green tea to deionized water is 1:10, then stir and extract at a temperature of 80° C. for 0.5 hours, and repeatedly extract 3 times, then filtered under reduced pressure, and the filtrates were combined to obtain a tea leaves test solution containing tea polysaccharides and tea polyphenols;

[0022] 3) At a temperature of 50° C. and a pressure of 0.09 MPa, place the above-mentioned tea leaves for test solution in a rotary evaporator and concentrate under reduced pressure to 1 / 4 of the original volume, and then add 3 times the volume to the concentrated tea leaves for test solution Precipitate with absolute ethanol, let it stand for 12 hours, then centrifuge at 2500 rpm for 8 min...

Embodiment 2

[0026] 1) adding water with 8% of its mass in the thick old green tea, and then extruding with a single-screw extruder at a temperature of 100° C. to pre-treat the raw materials;

[0027] 2) adding the above-mentioned thick old green tea that has been squeezed into deionized water, the mass ratio of the thick old green tea to deionized water is 1:5, then stirring and extracting at a temperature of 70° C. for 1.5 hours, and repeatedly extracting 4 times, then filtered under reduced pressure, and the filtrates were combined to obtain the tea leaves test solution containing tea polysaccharides and tea polyphenols;

[0028] 3) Place the above-mentioned tea leaves for test solution in a rotary evaporator at a temperature of 45°C and a pressure of 0.09 MPa to concentrate under reduced pressure to 1 / 8 of the original volume, and then add 3 times the volume to the concentrated tea leaves for test solution Precipitate with absolute ethanol, let it stand for 8 hours, then centrifuge at ...

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Abstract

A method for extracting tea polysaccharides and tea polyphenol from coarse old green tea comprises the following steps: extrusion treatment, extraction by deionized water, concentration, precipitation by ethanol, separation, vacuum freeze drying, and the like. The main difference between the method for extracting tea polysaccharides and tea polyphenol from coarse old green tea and the prior extracting method is that in the former one a single-screw extrusion machine is adopted to extrude material with optimum moisture content at optimum temperature so that the material is pretreated, then an aqueous extract method is utilized to obtain a general extract containing tea polysaccharides and tea polyphenol, and the tea polysaccharides is separated from the tea polyphenol in an alcohol deposition method. The extrusion treatment causes the organization structure of tea to be changed, thereby the yield coefficient of the tea polysaccharides and the tea polyphenol are high. Furthermore, under the extrusion action, the molecular structure of active ingredients in the tea is changed, thereby the activity can be reinforced. In addition, the coarse old green tea having plenteous source is utilized, thereby the serious waste of natural resources can be avoided. The method also has the advantage of simple technology.

Description

technical field [0001] The invention relates to a method for extracting tea polysaccharides and tea polyphenols, in particular to a method for extracting tea polysaccharides and tea polyphenols from crude green tea. Background technique [0002] The medicinal value of tea has a long history. According to "Shen Nong's Materia Medica", taking tea for a long time can "relieve the mind and nourish Qi, lighten the body and resist aging". According to Tang Dynasty "Compendiums of Materia Medica": "All medicines are medicines for various diseases, and tea is a medicine for all diseases." A large number of studies have shown that tea contains a variety of bioactive components that can be used, and the main components with utilization value are tea polyphenols, tea polysaccharides and caffeine. [0003] China produces about 100,000 tons of coarse old tea per year. With the improvement of people's living standards, coarse and old tea is becoming less and less popular, resulting in a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C07D311/62A61P3/10A61P39/06
Inventor 陈海霞张鑫付玲玲董鹏
Owner 江苏荣诚农业科技发展有限公司
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