Continuous phase change-based method for extracting tea polyphenol

A technology for extracting tea polyphenols, which is applied in the field of continuous phase change extraction of tea polyphenols, can solve problems such as the reduction of tea polyphenols extraction rate, and achieve the effects of increased extraction rate, high extraction efficiency, completeness and repeatability

Inactive Publication Date: 2015-01-21
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot water is commonly used as the extraction solvent in the traditional process. As the temperature rises, catechins are easily oxidized to form o-quinone primary products, and then polymerize into biphenol quinones, which are further oxidized to produce tea pigments, so that the tea polyphenols Leaching rate decreased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for continuous phase change extraction of tea polyphenols of the present invention comprises the following steps:

[0029] 1. Raw material treatment: Dry the tea leaves at 60°C, control the moisture content to about 4%, and crush them to 20-30 mesh to obtain tea powder raw materials.

[0030] 2. Put 2kg of the above-mentioned tea powder into the extraction kettle. Under the conditions of extraction temperature 50°C and extraction pressure 0.6Mpa, use 85% ethanol solution to extract for 80min at a flow rate of 120L / h. After extracting tea polyphenols, flow into the analysis kettle. The analysis temperature was 70°C and the analysis pressure was 0.12Mpa to obtain 0.99L of tea polyphenol alcohol solution, which was concentrated to no alcohol to obtain an aqueous solution. The yield of tea polyphenols was 23.6%, of which the EGCG content was 41.1%.

Embodiment 2

[0032] A method for continuous phase change extraction of tea polyphenols of the present invention comprises the following steps:

[0033] 1. Raw material processing: Dry the tea leaves at 60°C, control the moisture content to about 5%, and crush them to 40-50 mesh to obtain tea powder raw materials.

[0034] 2. Put 10kg of the above-mentioned tea powder into the extraction kettle. Under the conditions of extraction temperature 60°C and extraction pressure 0.8Mpa, use 80% ethanol solution to extract for 70min at a flow rate of 150L / h. After extracting tea polyphenols, flow into the analysis kettle. The analysis temperature was 70°C, and the analysis pressure was 0.15Mpa to obtain 4.35L of tea polyphenol alcohol solution, which was concentrated to no alcohol to obtain an aqueous solution. The yield of tea polyphenols was 25.5%, of which the EGCG content was 45.6%.

Embodiment 3

[0036] A method for continuous phase change extraction of tea polyphenols of the present invention comprises the following steps:

[0037] 1. Raw material processing: Dry the tea leaves at 60°C, control the moisture content to about 5%, and crush them to 60-80 mesh to obtain tea powder raw materials.

[0038] 2. Put 15kg of the above-mentioned tea powder into the extraction kettle. Under the conditions of extraction temperature 70°C and extraction pressure 1.2Mpa, use 75% ethanol solution to extract for 60min at a flow rate of 150L / h. After extracting tea polyphenols, flow into the analysis kettle. The analysis temperature was 75°C and the analysis pressure was 0.2Mpa to obtain 7.02L of tea polyphenol alcohol solution, which was concentrated to no alcohol to obtain an aqueous solution. The yield of tea polyphenols was 31.2%, of which the EGCG content was 43.4%.

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Abstract

The invention discloses a continuous phase change-based method for extracting tea polyphenol. The method comprises the steps of drying tea (including root, stems, leaves, flowers, fruits and the like) under 40-80 DEG C, wherein the content of moisture is controlled to 3-20 percent, crushing to powder of 20-80 meshes to obtain a tea powder material, feeding the tea powder material in an extraction kettle, compressing an extraction agent to a liquid extraction agent under the condition that the pressure and the temperature are lower than the critical pressure and the critical temperature of the extraction agent all the time, then continuously extracting the tea powder material in the extraction kettle for 50-120 minutes under the conditions that the extraction temperature is 50-70 DEG C and the extraction pressure is 0.3-2Mpa, and the liquid extraction agent can flow through the extraction kettle with the flow rate of 80-160L / h so as to obtain tea polyphenol, and enabling the extracted tea polyphenol to flow through a resolving kettle for resolving at 60-75 DEG C resolving temperature and 0.08-0.5Mpa resolving pressure. The method for preparing thw tea polyphenol has the high extraction rate of the tea polypheonl, and is safe, environmentally-friendly, low in cost and suitable for large-scale industrial production; the yield of the tea polyphenol prepared according to the method accounts for 10-35 percent of the yield of dry matters.

Description

technical field [0001] The invention relates to a method for extracting polyphenols, in particular to a method for continuous phase-change extraction of tea polyphenols. Background technique [0002] my country is rich in tea production, ranking first in the world in terms of area and output. The planting and consumption of tea are huge, but the consumption of tea is becoming more and more high-end, while the middle and low-grade teas are often unsalable and have a serious backlog. This phenomenon restricts the development of the tea industry. ; At the same time, a large amount of low-quality crude tea and leftovers are produced in the production and processing of tea. The processing and utilization of these low-value products to increase the added value of the product is expected to become a new economic growth point of the tea industry. research hotspots. The comprehensive utilization of tea is based on tea (including roots, stems, leaves, flowers, fruits, etc.) [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02C07G99/00
Inventor 肖苏尧曹庸杜洁戴伟杰陈雪香陈运娇
Owner SOUTH CHINA AGRI UNIV
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