Method for extracting theine from green tea

A technology of caffeine and green tea, which is applied in the direction of medical formulas, medical preparations containing active ingredients, plant raw materials, etc., can solve the problems of large amount of eluent, low purity of caffeine, and low product purity, and solve the problems of collection difficulties and cost The effect of low and high extraction rate

Inactive Publication Date: 2009-02-18
杨志孝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent method has the disadvantages of low product purity, poor safety (toxic reagents are commonly used as extraction agents), and complicated processes; the adsorption method has the disadvantages of a large amount of eluent or the use of toxic eluents; the SFE method has relatively high production costs and is still in the experimental stage. Laboratory research stage; the traditional direct sublimation method of green tea is easy to carbonize, the purity of caffeine is low, and the loss during collection is relatively large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Feed green tea powder and 20-mesh calcium oxide powder in a mass ratio of 5:1, put them in an extraction container and mix them thoroughly, control the temperature at 140°C, and dry them fully. Add a 20-mesh stainless steel wire mesh at a height of 5 cm from the sample in the container. Add a second layer of 40-mesh stainless steel wire mesh at a height of 4cm from the first layer of stainless steel wire mesh, cover the container with transparent tempered glass and seal it, control the temperature at 200°C for heating and extraction for 30 minutes, and collect white needles after cooling Caffeine, the yield is 1.21%, and the purity is 99.1%.

Embodiment 2

[0014] Feed green tea powder and 30-mesh calcium oxide powder in a mass ratio of 5:1.5, place them in an extraction container and mix them thoroughly, control the temperature at 100°C, and dry them fully. Add a 20-mesh stainless steel wire mesh at a height of 6 cm from the sample in the container. Add another layer of 40-mesh stainless steel mesh at a height of 3cm from the first layer of stainless steel mesh, cover the container with transparent tempered glass and seal it, control the temperature at 180°C for heating and extraction for 40 minutes, collect white needle-shaped caffeine after cooling, The yield was 1.20%, and the purity was 99.0%.

Embodiment 3

[0016] Feed green tea powder and 40-mesh calcium oxide powder in a mass ratio of 5:2, place them in an extraction container and mix them thoroughly, control the temperature at 160°C, and dry them fully. Add a 20-mesh stainless steel wire mesh at a height of 8 cm from the sample in the container. Add another layer of 40-mesh stainless steel wire mesh at a height of 2cm from the first layer of stainless steel mesh, cover the container with transparent tempered glass and seal it, control the temperature at 230°C for heating and extraction for 50 minutes, collect white needle-shaped caffeine after cooling, The yield was 1.2%, and the purity was 99.3%.

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Abstract

The present invention discloses a method of extracting theine from green tea. According to a weight ratio of 5 to (1 to 2), the green tea powder and calcium oxide powder of 40 to 60 meshes are added and mixed well in an extraction container; the mixture is fully dried at the temperature between 100 DEG C and 160 DEG C; a layer of stainless steel wire net is respectively arranged in two positions above the sample in the container, transparent armored glass is covered on the container for sealing, the temperature is controlled between 180 DEG C and 230 DEG C, the mixture is heated and extracted for 30 to 50 minutes; and after the mixture is cooled, white acicular crystal theine is collected from the stainless steel wire nets. The present invention has the advantages that the whole process is simple, only calcium oxide is needed, the cost is low, no pollution is caused, the purity of the extracted theine reaches above 99 percent, and the yield rate is above 1.2 percent.

Description

technical field [0001] The invention relates to the technical field of extraction of biological agents, in particular to a method for extracting caffeine from green tea. Background technique [0002] my country has a history of drinking tea for more than 2,000 years, and people have long recognized that drinking tea can strengthen the body and cure diseases. Recent studies have shown that drinking tea can not only refresh your mind and diuresis, but also have biological properties such as antibacterial and anti-inflammatory, lowering blood lipids, blood sugar and blood pressure, anti-aging, anti-radiation, anti-cancer, and anti-cancer. The main ingredient in tea is caffeine, which is a stimulant. Its content in raw tea is about 2% to 5%. Within a certain concentration range, it has physiological and health effects on the human body such as strengthening the heart, diuresis, and detoxification. It is medical caffeine. important source of . Shi X et al. used electron paramag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D473/12A61K36/82
Inventor 杨志孝苏延友杨振邴爱英方茜
Owner 杨志孝
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