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Technology for removing caffeine in tea

A caffeine-based technology, applied in the field of separation technology research and natural product extraction, can solve the problems of environmental pollution, expensive equipment, easy residual organic solvents, etc., and achieve the effect of convenient drinking, low-cost equipment, and simple operation process

Inactive Publication Date: 2017-05-31
SHANGHAI YIZHI MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of the literature and previous patents use organic solvent extraction [1]. The disadvantage of this process is that it pollutes the environment and easily leaves some organic solvents
Some use supercritical carbon dioxide extraction, which is environmentally friendly, but the equipment is more expensive
Neither of these methods can completely remove caffeine [2,3].
There are also various other techniques for decaffeinating, most of which are less effective

Method used

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  • Technology for removing caffeine in tea
  • Technology for removing caffeine in tea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Take 3 kg of commercially available Maojian green tea, add 4 to 12 liters of distilled water, heat to boiling, keep for 15 minutes, cool to about 50°C and filter under reduced pressure. Then add an appropriate amount of distilled water (leaves just submerged) to the tea leaves, do the same thing twice, and combine the filtrates.

[0020] (2) Add the filtrate to a well-balanced MCI-GEL chromatographic column, let the extract flow down naturally, and collect the effluent.

[0021] (3) Elute the chromatographic column with an appropriate ratio of ethanol-water system, and the eluate is basically caffeine, which is collected separately.

[0022] (4) Elute the chromatographic column after step 3 with pure ethanol, collect the eluate and combine it with the eluate from step 2, and concentrate to dryness under reduced pressure to obtain about 400 g of extract, which is pulverized.

[0023] (5) No caffeine peak was detected in the obtained sample by the aforementioned HPLC...

Embodiment 2

[0025] (1) Take 4 kg of commercially available Longjing green tea, add 12-16 liters of distilled water, heat to boiling, keep for 15 minutes, cool to about 50°C and filter under reduced pressure. Then add an appropriate amount of distilled water (leaves just submerged) to the tea leaves, do the same thing twice, and combine the filtrates.

[0026] (2) Add the filtrate to a well-balanced MCI-GEL chromatographic column, let the extract flow down naturally, and collect the effluent.

[0027] (3) Elute the chromatographic column with an appropriate ratio of ethanol-water system, and collect the high-concentration caffeine solution separately.

[0028] (4) Elute the chromatographic column after step 3 with pure ethanol, collect the eluate, combine it with the eluate from step 2, and concentrate to dryness under reduced pressure to obtain about 500 grams of extract, which is pulverized.

[0029] (5) No caffeine peak was detected in the obtained sample by the aforementioned HPLC met...

Embodiment 3

[0031] (1) Take 3 kg of commercially available black tea, add 4 to 12 liters of distilled water, heat to boiling, keep for 15 minutes, cool to about 50°C and filter under reduced pressure. Then add an appropriate amount of distilled water (leaves just submerged) to the tea leaves, do the same thing twice, and combine the filtrates.

[0032] (2) Add the filtrate to a well-balanced MCI-GEL chromatographic column, let the extract flow down naturally, and collect the effluent.

[0033] (3) Elute the chromatographic column with an appropriate ratio of ethanol-water system, and the eluate is basically caffeine, which is collected separately.

[0034] (4) Elute the chromatographic column after step 3 with pure ethanol, collect the eluate and combine it with the eluate from step 2, and concentrate to dryness under reduced pressure to obtain about 400 g of extract, which is pulverized.

[0035] (5) No caffeine peak was detected in the obtained sample by the aforementioned HPLC method....

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Abstract

The invention belongs to the technical research field of natural product extraction and separation processes. By adopting an MCI-GEL (Middle Chromatogram Isolated Gel) column chromatography, using a certain ratio of ethanol-water as an eluent, and combining water decoction, vacuum distillation and other processes, caffeine-free instant tea can be prepared by green tea, black tea and the like. The technology is simple in process, relatively low in cost and non-toxic. The product is suitable for people who are excitable when drinking tea and are difficult to sleep after drinking tea at night. In addition, the tea leaves with poor appearance or tea stems can be prepared by the process into salable products. Furthermore, bitter ingredients in the tea can be removed, and thus the taste can be improved by the process. The process retains tea polyphenols, polysaccharides, amino acids and other ingredients. The resulting caffeine-rich by-product can also be used as a raw material for preparing caffeine in the future.

Description

technical field [0001] The invention belongs to the technical research field of extraction and separation of natural products. It involves the removal of caffeine in tea beverages, the retention of active ingredients and other process technology research content. Background technique [0002] Tea has a long history in China and is one of the main drinks in human life. Tea is rich in polyphenols, polysaccharides, amino acids, proteins, vitamins and other beneficial chemical components. It has the functions of anti-aging, anti-cancer, weight loss, lowering blood fat, antibacterial, and reducing radiation damage. [0003] The caffeine in tea can stimulate the nerve center, affect the quality of sleep, and cause neurasthenia over time. Caffeine can also make the human heart beat faster, thereby raising blood pressure. In addition, caffeine will also complex with calcium ions and ferric ions, causing the loss of trace elements and increasing the risk of osteoporosis and anemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/38
CPCA23F3/38
Inventor 王先友袁琦郝喜才刘亚芳程浩武小红
Owner SHANGHAI YIZHI MEDICAL TECH
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