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Method for extracting caffeine from tea

A technology of caffeine and tea, applied in the direction of organic chemistry, can solve the problems of environmental pollution, resource loss, etc., and achieve the effect of no chemical raw material residue, low cost and good effect

Inactive Publication Date: 2015-10-14
JIANGSU TIANSHENG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As a big country of tea production, there will be a large amount of old tea surplus in our country every year. Not using it will not only cause the loss of resources, but also bring serious pollution to the environment. If these teas can be discarded and recycled, it will give The economy and medicine have brought great development, so the technology of extracting caffeine from tea is also being updated day by day. Finding a high-efficiency and low-cost extraction method is an important guarantee to solve the problem of whether a large amount of tea can be recycled

Method used

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  • Method for extracting caffeine from tea
  • Method for extracting caffeine from tea
  • Method for extracting caffeine from tea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Extraction: Add 25ml of 95% ethanol and zeolite in a 100ml round bottom flask, and install a Soxhlet extractor. Put the paper sleeve containing 10g of tea powder into the Soxhlet extractor, install a serpentine condenser, and add an appropriate amount of ethanol from its upper opening until it just siphons down.

[0034] (2) Heating to reflux for about two hours, the color of the extract becomes lighter and the extraction can be terminated.

[0035] (3) Transfer the extract to a 100ml distillation product, add several zeolites, install a distillation device, and carry out distillation. .

[0036] (4) Pour the remaining liquid into an evaporating dish, rinse the flask with a small amount of ethanol, put it into the evaporating dish, add 3g of quicklime, stir on a steam bath, evaporate to dryness, and grind to a light green powder.

[0037] (5) Sublimation: Cover the evaporating dish with the sample with a piece of filter paper, and then carry out sublimation.

[0...

Embodiment 2

[0041] The improvement of embodiment 2 heating mode

[0042] The specific test steps are the same as in Example 1, except that the heating method is changed.

[0043] Many heating methods are analyzed from the stability and effect of heating. The following heating methods are mainly used for comparison. The experimental results are as follows:

[0044] way to heat up

[0045] From the above table, it can be seen that the heating effect of the electric heating mantle is more obvious than that of the alcohol lamp, and the obtained caffeine yield is higher. The reason is that the heating of the alcohol lamp is uneven and the temperature is not easy to control, while the heating of the electric heating mantle is stable and easy to control the temperature.

Embodiment 3

[0046] The improvement of embodiment 3 extractant

[0047] The specific test steps are the same as in Example 1, except that the extractant is changed.

[0048] Water, aqueous ethanol and acetone are mainly used as extractants. Under the same other conditions and only the extractant is changed, the experiments are compared to draw conclusions. The experimental results are as follows:

[0049] Types of extractants

water

ethanol

acetone

Amount of tea (g)

10

10

10

Solvent consumption (ml)

120

120

120

Siphon times

8

8

8

Siphon time(min)

145

124

102

Caffeine production (mg)

23.5

57.4

41.5

[0050] As can be seen from the above table, it can be seen that the yield obtained by using ethanol as the extractant is higher, and the siphon time of water as the extractant is longer, and it is difficult to effectively remove during distillation, resulting in partial lo...

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Abstract

The invention discloses a method for extracting caffeine from tea. The method specifically comprises the following steps: adding ground tea into a reactor equipped with a Soxhlet extractor and internally provided with ethanol and zeolite; performing heating reflux for 1.8-2.2h; distilling an extracting solution; boiling the extracting solution for 10-60 min; pouring the left liquid into a evaporation pan; adding quicklime into the pan; stirring the obtained mixture on a steam bath till the mixture is dried; grinding the obtained solid to light green powder; and performing sublimation to obtain caffeine. According to the method, waste tea can be utilized, and environment pollution is avoided. The method is simple, is low in cost, and has an excellent application value.

Description

technical field [0001] The invention belongs to the technical field of plant extraction, and in particular relates to a method for extracting caffeine from tea leaves. Background technique [0002] Caffeine is of great significance to the human body. Physiologically, it can stimulate the central nervous system of the human body to cause excitement, effectively promote human metabolism, and at the same time strengthen muscle contraction. It can also keep the human brain clear and has a positive effect on thinking It has a great effect, and can promote blood circulation in the body, facilitate the discharge of urine, relieve human fatigue, and improve work efficiency. In addition, caffeine can enhance the function of the heart and gastrointestinal tract, and regulate fat metabolism. [0003] After research, it is found that tea contains nearly 500 kinds of ingredients, mainly including alkaloids, flavonoids, phenols, lipids and amino acids, etc. , zinc, and other minerals. ...

Claims

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Application Information

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IPC IPC(8): C07D473/12
CPCC07D473/12
Inventor 季浩郑仁贵窦长清刘佳
Owner JIANGSU TIANSHENG PHARMA
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