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Removal of caffeine from polyhydric phenol by supercritical carbon dioxide process

A technology of carbon dioxide and tea polyphenols, which is applied in the field of removing caffeine from tea polyphenols and tea polyphenols products, can solve the problems of cumbersome procedures, excessive metal ion residues, and low utilization rate of carbon fibers, etc., and achieve the effect of simple process

Inactive Publication Date: 2005-05-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is cumbersome, and the product has the problem of excessive residues of organic solvents and metal ions; U.S. Patent (5,702,747) uses activated carbon fiber to adsorb and remove caffeine in the crude extract of green tea water, but it is difficult to reanalyze caffeine from activated carbon fiber, making carbon fiber The utilization rate of the product is not high, and the production cost of the product increases
Patent (86103112) "method for removing caffeine from tea" using supercritical CO 2 Direct extraction from tea leaves to remove caffeine, but does not involve the use of tea polyphenols as raw materials to remove caffeine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 100 grams of tea polyphenol raw materials, wherein the catechin content is 80.0%, the caffeine content is 3%, put into a supercritical extraction kettle, and inject CO2 with a high-pressure pump 2 When the pressure of the kettle is 8MPa, the temperature of the kettle is set to 32°C, the inlet and outlet valves of the extraction kettle are closed, the high-pressure pump is turned off, and the pressure is maintained and the raw materials are statically impregnated for 0.5 hours. Open the inlet and outlet valves of the extraction kettle, start the high-pressure pump, keep the kettle pressure and temperature constant, and the CO 2 The flow rate is set to 10kg / h, the temperature of the separator is set to 40°C, and the pressure is 4MPa, and the extraction raw material is continuously circulated in the extraction tank-separator-extraction tank extraction circuit.

[0015] Caffeine in supercritical CO 2 The solubility in coffee is larger than that of polyphenols such as...

Embodiment 2

[0018] Weigh 100 grams of tea polyphenol raw materials, wherein the catechin content is 90.0%, the caffeine content is 2%, put it into a supercritical extraction kettle, and inject CO with a high-pressure pump 2 The kettle pressure is 15MPa, the kettle temperature is set to 40°C, the inlet and outlet valves of the extraction kettle are closed, the high-pressure pump is turned off, the pressure is maintained, and the raw materials are statically impregnated for 1 hour. Open the inlet and outlet valves of the extraction kettle, start the high-pressure pump, keep the kettle pressure and temperature constant, and the CO 2 The flow rate is set to 20kg / h, the temperature of the separator is set to 45°C, and the pressure is 5MPa, and the extraction raw material is continuously circulated in the extraction tank-separator-extraction tank extraction circuit. After 3 hours, the extraction was stopped, the pressure was released, the extraction kettle was opened, and the tea polyphenol pro...

Embodiment 3

[0020] Weigh 100 grams of tea polyphenol raw materials, wherein the catechin content is 93.0%, and the caffeine content is 2.8%, put it into a supercritical extraction kettle, and use a high-pressure pump to inject CO 2 When the pressure of the kettle is 30MPa, the temperature of the kettle is set to 55°C, the inlet and outlet valves of the extraction kettle are closed, the high-pressure pump is turned off, and the pressure is maintained and the raw materials are statically impregnated for 2 hours. Open the inlet and outlet valves of the extraction kettle, start the high-pressure pump, keep the kettle pressure and temperature constant, and the CO 2 The flow rate is set to 40kg / h, the temperature of the separator is set to 50°C, and the pressure is 7MPa, and the extraction raw material is continuously circulated in the extraction tank-separator-extraction tank extraction circuit. After 4 hours, the extraction was stopped, the pressure was released, the extraction kettle was ope...

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Abstract

Removal of caffeine from theapolyphenol by supercritical dioxide process is carried out by: using CO2 in food grade, converting it into supercritical CO2 by pressure, putting theapolyphenol in a extractor, filling supercritical CO2 at high pressure to soak it fully, continuously and selectively extracting out by selecting parameters such as temperature and pressure and time to obtain theapolyphenol without residual solvent and low caffeine content, which can be used in food and health-care food and medicines as anti-oxidizing agent.

Description

technical field [0001] The invention relates to a method for removing caffeine in tea polyphenols, in particular to a method for removing caffeine in tea polyphenols with supercritical carbon dioxide. 2 As a solvent, remove the caffeine in tea polyphenols to obtain tea polyphenols products with low caffeine content. It belongs to the field of deep processing of tea products. Background technique [0002] Tea polyphenols are polyphenolic compounds extracted from tea leaves. Recent studies have shown that tea polyphenols have anti-cancer, anti-radiation, anti-aging, anti-inflammatory, antibacterial and other effects, and have important application value in health food and medicine. However, tea polyphenol products directly extracted from tea leaves generally contain about 2% to 10% caffeine. Excessive caffeine may affect the physiological system of the human body, showing symptoms such as restlessness, insomnia, easy to wake up, diarrhea, headache and heart palpitations. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D311/62
CPCY02P20/54
Inventor 于文利赵亚平
Owner SHANGHAI JIAO TONG UNIV
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