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Method for extracting tea polysaccharides by hydrothermal method

A technology of tea polysaccharide and hydrothermal method, applied in the field of chemical engineering, to achieve the effect of increased yield and simple operation process

Active Publication Date: 2016-11-02
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201410138882.8 discloses a method of inserting strains into tea powder or tea dregs for step-by-step solid-state fermentation to extract tea polysaccharides, and CN201510876422.X discloses a method for extracting green tea polysaccharides by combining traditional water extraction and modern enzyme engineering, Due to the specificity and selectivity of enzymes in the above enzyme extraction methods, factors such as pH value, enzymatic hydrolysis temperature and enzymatic hydrolysis time should be paid attention to during extraction, which limits the large-scale use of enzymatic extraction of tea polysaccharides.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) After drying the big-leaf oolong tea leaves, crush them to 40-60 mesh;

[0024] (2) Weigh 1 kg of the pulverized sample described in step (1), add it to 10 L of water, and stir and extract for 2.0 h at a temperature of 120° C. and a pressure of 0.1 MPa;

[0025] (3) filtering the extract described in step (2);

[0026] (4) The filtrate described in step (3) is dialyzed for 1 day using a 3kDa dialysis bag;

[0027] (5) The dialyzed solution described in step (4) is concentrated to 30% by three-effect downstream evaporation;

[0028] (6) The concentrated solution in step (5) is centrifugally spray-dried to obtain tea polysaccharide with a yield of 5.5%.

Embodiment 2

[0030] (1) After drying Shancha No. 1 tea leaves, crush them to 40-60 meshes;

[0031] (2) Weigh 1 kg of the pulverized sample described in step (1), add it to 30 L of water, and stir and extract at a temperature of 200° C. and a pressure of 2.5 MPa for 0.5 h;

[0032] (3) centrifuging the extract described in step (2) for 20 min at a rotating speed of 1000 rpm / min;

[0033] (4) The centrifugate described in step (3) was dialyzed for 2 days using a 4kDa dialysis bag;

[0034] (5) The dialyzed solution described in step (4) is concentrated to 35% by three-effect downstream evaporation:

[0035] (6) Pressure spray drying the concentrated solution in step (5) to obtain tea polysaccharide with a yield of 7.2%.

Embodiment 3

[0037] (1) After drying Longjing 43 tea leaves, crush them to 40-60 meshes;

[0038] (2) Weigh 1 kg of the pulverized sample described in step (1), add it to 20 L of water, and stir and extract for 1.5 h at a temperature of 140° C. and a pressure of 0.5 MPa;

[0039] (3) centrifuging the extract described in step (2) for 5 min at a rotating speed of 5000 rpm / min;

[0040] (4) The centrifugate described in step (3) was dialyzed for 3 days using a 150kDa dialysis bag;

[0041] (5) The dialyzed solution described in step (4) is concentrated to 40% by three-effect downstream evaporation;

[0042] (6) The concentrated liquid in the step (5) is air-flow spray-dried to obtain tea polysaccharide with a yield of 4.1%.

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Abstract

The invention discloses a method for extracting tea polysaccharides by a hydrothermal method. The method comprises the following steps: (1) raw material tea, tea branches, processing residues of tea or processing waste of tea are dried and pulverized to 40-60 mesh sieve; (2) extraction is carried out for pulverized raw materials whose mass unit is kg and water whose volume unit is L by a high-temperature high-pressure reaction vessel with stirring at 120-200 DEG C with a pressure of 0.1-2.5MPa for 0.5-2.0 hours, wherein the mass volume ratio between the raw materials and water is 1:10-1:30; (3) separation, condensation and drying are carried out for extract liquid, in order to obtain tea polysaccharide. Compared with the prior art, the method has the advantages of simple operation flow, safety without usage of organic solvents, and high yield.

Description

technical field [0001] The invention relates to a method for extracting tea polysaccharides, in particular to a method for extracting tea polysaccharides by a hydrothermal method, which belongs to the field of chemical engineering. Background technique [0002] Tea polysaccharide has good physical and chemical properties and significant physiological activities such as lowering blood sugar, blood fat, lowering blood pressure, enhancing immunity, anticoagulation, antithrombotic and hypoxia resistance, and treating diabetes. In recent years, tea polysaccharide has become a natural medicine , biochemistry, and life science research hotspots. Due to its wide application base, the extraction and separation of tea polysaccharides has become particularly critical. [0003] At present, the extraction methods of tea polysaccharides mainly include hot water extraction (≤100°C) or enzymatic extraction, etc., for example, a method for separating and extracting natural tea polysaccharid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
CPCC08B37/0003
Inventor 高岳芳肖斌余有本周天山鲍露
Owner NORTHWEST A & F UNIV
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