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Preparation method of raw material tea for extracting polyester type catechin

A technology for polyester catechins and raw materials, applied in the field of tea processing, can solve the problems of difficult extraction and purification, low content of polyester catechins, etc., and achieve the effect of improving enzyme activity and moisture content

Pending Publication Date: 2022-03-01
TEA RES INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the content of polyester catechin in the existing black tea raw materials is low and the extraction and purification are difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Picking of fresh leaves: pick raw materials of large-leaf species from Yunnan, with a tenderness of one bud and three or four leaves, the EGCG content is higher than 4.00%, and the EGCG:ECG is greater than 2:1.

[0016] 2) Withering: use the withering trough to wither, and the moisture content of the withered leaves is 65-68%.

[0017] 3) Kneading and cutting: Use a kneading and cutting machine to knead and cut for 2 to 3 times, and the cut leaves are 2 to 4 mm in size.

[0018] 4) Enzyme addition: Knead and cut raw materials to spray enzyme liquid, in which the source of enzyme is Fengshui pear juice, and the amount of enzyme sprayed is 1-3%.

[0019] 5) Fermentation: High-temperature aerobic fermentation is adopted, the fermentation temperature is 35-40°C, and fresh air is introduced into the fermentation machine for gas exchange. The fermentation time is 30-50 minutes, and it is turned once every 2-5 minutes.

[0020] 6) Drying: Use a fluidized bed dryer to dry, ...

Embodiment 2

[0023] 1) Picking of fresh leaves: pick raw materials of large-leaf species from Yunnan, with a tenderness of one bud and three or four leaves, the EGCG content is higher than 4.00%, and the EGCG:ECG is greater than 2:1.

[0024] 2) Withering: use the withering trough to wither, and the moisture content of the withered leaves is 65-68%.

[0025] 3) Kneading and cutting: Use a kneading and cutting machine to knead and cut for 3 to 4 times, and the cut leaves are 1 to 2 mm in size.

[0026] 4) Enzyme addition: Knead and cut raw materials to spray enzyme liquid, in which the source of enzyme is Fengshui pear juice, and the amount of enzyme sprayed is 2-4%.

[0027] 5) Fermentation: High-temperature aerobic fermentation is adopted, the fermentation temperature is 35-40°C, and fresh air is introduced into the fermentation machine for gas exchange. The fermentation time is 40-60 minutes, and it is turned once every 2-5 minutes.

[0028] 6) Drying: Use a fluidized bed dryer for dryi...

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Abstract

The invention relates to a preparation method of raw tea for extracting polyester catechin, and belongs to the technical field of tea processing. According to the method, fresh leaf varieties with high EGCG (epigallocatechin gallate) content and low ECG (epigallocatechin gallate) content are used as raw materials, and the raw material tea for extracting the polyester type catechin is processed and formed through the processes of withering, rolling and cutting, enzyme adding, fermenting and drying. According to the method disclosed by the invention, the polyester type catechin content is quickly increased by controlling raw materials, regulating and controlling the withering degree and combining the processes of increasing Fengshui pear enzyme, quickly chopping by kneading and cutting, performing high-temperature oxygen-introducing fermentation and the like, so that the polyester type catechin content reaches the maximum value after black tea is fermented for 30-60 minutes, and the polyester type catechin content is further increased by combining fluidized bed type drying equipment; therefore, the raw material tea for extracting the polyester type catechin is obtained, and the content of the polyester type catechin in the raw material tea exceeds 0.60%.

Description

technical field [0001] The invention belongs to the technical field of tea processing, and in particular relates to a method for preparing raw tea for extracting polyester catechins. Background technique [0002] Polyester catechin is a new type of catechin dimer discovered in recent years. The polyester catechin in tea is mainly polyester catechin A (TSA). TSA is composed of 2 EGCG Molecular oxidative polymerization, during the fermentation process of black tea, EGCG and ECG are oxidatively polymerized to form theaflavins, and EGCG itself is oxidatively polymerized to form TSA. Therefore, the formation of TSA and theaflavins has a competitive substrate relationship during black tea processing. Polyester catechins have strong anti-oxidation, anti-tumor, anti-inflammatory, bactericidal, hypoglycemic, and weight-loss effects, and are important substances that affect the quality of black tea. Polyester-type catechin has good functional activity, but the content of polyester-t...

Claims

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Application Information

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IPC IPC(8): A23F3/06A23F3/08A23F3/10
CPCA23F3/06A23F3/08A23F3/10
Inventor 江和源王伟伟张建勇
Owner TEA RES INST CHINESE ACAD OF AGRI SCI
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