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Method for subcritical fluid extraction of tea extract

A technology of subcritical fluid and tea extract, applied in the direction of tea extraction, etc., can solve the problems of destruction of tea bioactive components, high cost of production equipment, unfavorable treatment of tea dregs, etc., achieve good reuse, lower production conditions, and lower costs Effect

Inactive Publication Date: 2015-07-01
COFCO NUTRITION & HEALTH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that the water content in the tea dregs produced by the tea extract preparation method in the prior art is high, which is not conducive to the treatment of the tea dregs in the later stage, and the required extraction conditions are relatively high, resulting in some Some bioactive components are destroyed and the cost of production equipment is high, thus providing a subcritical fluid extraction method for tea extract with good extraction effect, low equipment cost, and low water content of the produced tea dregs

Method used

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  • Method for subcritical fluid extraction of tea extract

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Effect test

Embodiment 1

[0028] In the method for subcritical fluid extraction of tea leaf extract of the present embodiment, the tea leaves used are green tea, which specifically includes the following steps:

[0029] 1) Take 600g of tea leaves, at a temperature of 60°C and a pressure of 3MPa, control the solid-liquid ratio of the tea leaves to the dimethyl ether subcritical fluid to be 1:1, and the flow rate of dimethyl ether to be 1kg / h. Ether subcritical fluid continuous dynamic extraction for 30min to obtain the extraction mixture;

[0030] 2) Enrich the extraction mixture obtained in step 1) in a separation tank, and keep the temperature at 60°C and the pressure at 1.2 MPa to vaporize the dimethyl ether subcritical fluid to obtain the tea extract.

[0031] 3) Collect and cool the gaseous dimethyl ether subcritical fluid obtained in step 2), and recycle the liquid dimethyl ether subcritical fluid obtained by condensing.

[0032] 4) When the predetermined extraction time is reached, the extractio...

Embodiment 2

[0034] In the method for subcritical fluid extraction of tea leaf extract of the present embodiment, the tea leaves used are black tea, which specifically includes the following steps:

[0035] 1) Take 60g of tea leaves, at a temperature of 15°C and a pressure of 0.4MPa, control the solid-liquid ratio of the tea leaves to the dimethyl ether subcritical fluid to be 1:20, and the flow rate of dimethyl ether to be 50kg / h. Continuous dynamic extraction of methyl ether with subcritical fluid for 270 minutes to obtain the extraction mixture;

[0036] 2) Enrich the extraction mixture obtained in step 1) in a separation tank, keep the temperature at 40°C, and vacuumize -0.08MPa to vaporize the dimethyl ether subcritical fluid to obtain tea leaf extract .

[0037] 3) Collect and cool the gaseous dimethyl ether subcritical fluid obtained in step 2), and recycle the liquid dimethyl ether subcritical fluid obtained by condensing.

[0038] 4) When the predetermined extraction time is rea...

Embodiment 3

[0040] In the method for subcritical fluid extraction of tea leaf extract in this embodiment, the tea leaf used is oolong tea, which specifically includes the following steps:

[0041]1) Take 600g of tea leaves, use water as an auxiliary agent, and mix the tea leaves with the auxiliary agent at a temperature of 40°C and a pressure of 0.4 MPa. The weight ratio of the auxiliary agent to the tea leaves is 75:100. The solid-liquid ratio of the tea leaves and the dimethyl ether subcritical fluid is controlled to be 1:10, the flow rate of dimethyl ether is 5 kg / h, and the dimethyl ether subcritical fluid is used for continuous dynamic extraction for 150 minutes to obtain an extraction mixture;

[0042] 2) Enrich the extraction mixture obtained in step 1) in a separation tank, and keep the temperature at 50°C and the pressure at 0.2 MPa to vaporize the dimethyl ether subcritical fluid to obtain the tea extract.

[0043] 3) Collect and cool the gaseous dimethyl ether subcritical fluid...

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Abstract

The invention provides a method for subcritical fluid extraction of tea extract. The method comprises the following steps of carrying out dimethyl ether subcritical fluid continuous dynamic extraction on tea at a temperature of 15-60 DEG C under pressure of 0.4-3MPa for 30-270min so that an extract mixture is obtained, removing tea residue from the extract mixture, and carrying out dimethyl ether subcritical fluid gasification at a temperature of 40-60 DEG C under the pressure of -0.08 to 1.2MPa so that the tea extract is obtained. The method needs a low temperature and low pressure in extraction, prevents biologically-active substances in tea from being destroyed, and has a low equipment cost. The tea residue has low water content and a high recycle value. The method can be widely used in the field of tea extract preparation.

Description

technical field [0001] The invention belongs to the field of preparation of tea extracts, and in particular relates to a method for extracting tea extracts with a subcritical fluid. Background technique [0002] Tea contains various nutrients and medicinal ingredients such as tea polyphenols, tea pigments, tea proteins, and tea polysaccharides. With the acceleration of the pace of life in human society, ready-to-drink tea beverages, ready-to-brew instant tea and tea polyphenol health products are increasingly favored by consumers. A large amount of tea dregs will be produced after the preparation of tea extracts. Due to the gradual expansion of the market for tea beverages, instant tea, tea polyphenol health products and other products, the treatment of tea dregs has gradually attracted people's attention. [0003] In the prior art, hot water or organic solvent soaking technology is often used to prepare tea extracts, but the water content in the obtained tea waste residue ...

Claims

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Application Information

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IPC IPC(8): A23F3/16
Inventor 赵抒娜林旭琦
Owner COFCO NUTRITION & HEALTH RES INST
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