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Method of high effect preparing tea polyphenol

A technology of tea polyphenols and process method, applied in the field of tea polyphenols production process, can solve the problems of high energy consumption, low extraction rate, high production cost, etc., and achieve simple process flow, less solvent consumption, and fast mass transfer rate Effect

Inactive Publication Date: 2004-10-06
NORTHEAST FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, tea polyphenols are mainly extracted from dry tea or tea powder, and the old leaf resources with high content of tea polyphenols and low price have not been utilized, so the production cost is high and the utilization rate of tea is low; in the extraction method, boiling water Leaching or ethanol and other organic solvent extraction methods require heating, high energy consumption, low extraction rate, long cycle, and easy destruction of active ingredients; supercritical extraction methods are expensive, and the purity of the extract is not high, which increases the difficulty of purification accordingly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 20kg of fresh tea leaves, add 100L of 40% ethanol, add it to a homogenizer for solid-liquid extraction of the homogenate for 5 minutes, carry out negative pressure suction filtration on the homogenate, and add 100L of 40% ethanol solution to the obtained filter residue in a cavitation tank for extraction Negative-pressure cavitation mixed-rotation solid-liquid extraction for 20 minutes, repeated twice, combined the above three extracts, a total of 302L, the extract was concentrated under negative pressure to obtain a concentrated solution of 157L, filtered under negative pressure, and the filtrate was added to 160L of dichloromethane in Carry out negative pressure cavitation mixed liquid-liquid extraction in the cavitation tank, the cavitation time is 10 minutes, centrifuge again, after repeating the operation twice, merge the methylene chloride layer, reclaim methylene chloride 311L in a vacuum, and obtain caffeine; Then add 160L of ethyl acetate to the raffinate w...

Embodiment 2

[0026] Take 20kg of fresh tea leaves, add 100L of 60% ethanol, add it to a homogenizer for solid-liquid extraction of the homogenate for 3 minutes, carry out negative pressure suction filtration on the homogenate, and add 100L of 60% ethanol solution to the obtained filter residue in a cavitation tank for extraction Negative pressure cavitation mixed-rotation solid-liquid extraction for 20 minutes, repeated twice, combined the above three extracts, a total of 296L, and concentrated under negative pressure to obtain a concentrated solution of 131L, and then added 130L of dichloromethane to the concentrated solution, and carried out negative extraction in a cavitation tank. Compressed cavitation mixed liquid-liquid extraction, cavitation time is 10 minutes, centrifugation, after repeating the operation 2 times, combine the dichloromethane layer, recover 242L of dichloromethane under negative pressure, and obtain caffeine. Add 130L of ethyl acetate to the raffinate water layer and...

Embodiment 3

[0028]Take 20kg of fresh tea leaves, add 100L of 80% ethanol, add it to a homogenizer for solid-liquid extraction of the homogenate for 3 minutes, carry out negative pressure suction filtration on the homogenate, and add 100L of 80% ethanol solution to the obtained filter residue in a cavitation tank for extraction Negative pressure cavitation mixed-rotation solid-liquid extraction for 30 minutes, repeated twice, combined the above three extracts, a total of 284L, concentrated under negative pressure to obtain a concentrated solution of 78L, and then added 160L of dichloromethane to the concentrated solution, and carried out negative extraction in a cavitation tank. Compression cavitation mixed liquid-liquid extraction, cavitation time is 20 minutes, centrifugation, after repeating the operation 2 times, the dichloromethane layer is combined, and 305 L of dichloromethane is recovered under negative pressure, and caffeine is obtained. Add 160L of ethyl acetate to the raffinate w...

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Abstract

A process for effectively preparing the theapolyphenol includes mixing fresh tea leaves with solvent, homogenizing, solid-liquid extracting, filtering, mixing dregs with solvent, solid-liquid extracting, collecting the liquid extract, concentrating, mixing with dichloromethane solution, liquid-liquid extracting, centrifugal treating, mixing the liquid extract with ethyl acetate, liquid-liquid extracting, centrifugal treating, filtering, concentrating, drying and purifying. Its advantages are short period and high output rate.

Description

Technical field: [0001] The invention relates to a production process of tea polyphenols. In particular, it relates to a process method for producing high-purity tea polyphenols by using fresh tea leaves to carry out homogenized solid-liquid extraction, negative pressure cavitation mixed-rotation solid-liquid extraction, and negative-pressure cavitation mixed-rotation liquid-liquid extraction. Background technique: [0002] Tea has a history of four or five thousand years as a traditional health drink of the Chinese nation. It is a research topic of great significance to develop new uses of tea and carry out comprehensive utilization of tea, especially the use of unprocessed fresh tea, which can be old or young leaves to produce high value-added fine chemicals. [0003] Tea polyphenols (TP) is the general term for polyphenols in tea. It is a white shaped powder, soluble in water, soluble in ethanol, methanol, acetone, ethyl acetate, insoluble in chloroform. The content of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D311/62
CPCY02P20/582
Inventor 祖元刚高彦华付玉杰史权祖柏实薛艳华张琳
Owner NORTHEAST FORESTRY UNIVERSITY
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