Method for preparing theabrownin

A technology of theabrownin and water layer, applied in the field of preparing theabrownin, can solve the problems of consuming Pu'er tea and the like

Inactive Publication Date: 2013-09-18
TIANJIN TASLY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] After research, the present invention finds a method for preparing theabrownin analogues using gallic acid as a

Method used

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  • Method for preparing theabrownin
  • Method for preparing theabrownin
  • Method for preparing theabrownin

Examples

Experimental program
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Embodiment 1

[0070] Accurately weigh 422mg of gallic acid, place it in a 250ml round bottom flask, add 100ml of water and 0.5ml of ammonia water, stir at room temperature for 48h, and obtain a crude theabrownin solution. The solution was transferred to a 250ml separatory funnel, extracted twice with ethyl acetate, the water phase was extracted twice with an equal volume of n-butanol, and the water phase was dried under reduced pressure to obtain 402 mg of homemade theabrownin.

Embodiment 2

[0072] Accurately weigh 200 mg of gallic acid, place it in a 250 ml round bottom flask, add 40 ml of water and 0.3 ml of ammonia water, stir at room temperature for 24 hours, and obtain a crude theabrownin solution. The solution was transferred to a 250ml separatory funnel, extracted once with ethyl acetate, the water phase was extracted once with an equal volume of n-butanol, and the water phase was dried under reduced pressure to obtain 200 mg of homemade theabrownin.

Embodiment 3

[0074] Accurately weigh 600mg of gallic acid, place it in a 250ml round bottom flask, add 600ml of water and 0.6ml of ammonia water, stir at room temperature for 48h, and obtain a crude theabrownin solution. The solution was transferred to a 250ml separatory funnel, extracted three times with ethyl acetate, the water phase was extracted three times with an equal volume of n-butanol, and the water phase was dried under reduced pressure to obtain 600 mg of homemade theabrownin.

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Abstract

The invention provides a method for preparing a similar substance of theabrownin by taking gallic acid as a raw material. The method particularly comprises the following steps of: 1, adding the gallic acid into ammonia water for reaction to obtain crude theabrownin; 2, extracting the crude theabrownin by ethyl acetate to obtain a water layer; 3, extracting the water layer by normal butanol to obtain a water layer; and 4, drying to obtain the theabrownin. By adopting the method, the problem of high consumption of puer tea for extracting the theabrownin in a conventional process is solved.

Description

Technical field: [0001] The invention relates to a method for preparing theabrownin, in particular to a method for preparing theabrownin by using gallic acid as a raw material. Background technique: [0002] Polyphenols in tea are important active substances in tea. It is a general term for various phenolic compounds in tea. 60% to 80% of the total amount is closely related to the tea soup color, taste and aroma. [0003] The water-soluble products of polyphenols are mainly theaflavins, thearubigins and theabrownins. Theabrownin is a general term for a class of products with a very complex structure formed by oxidative polymerization of catechins. During the processing of Pu-erh tea, 80% of theaflavins and thearubigins are oxidized and polymerized to form theabrownins, and their content becomes The astringency and bitterness of the tea soup are significantly reduced, coupled with the higher content of sugar and soluble water extracts, which form the material basis for the ...

Claims

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Application Information

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IPC IPC(8): C08G65/44
Inventor 顾睿李瑞明王玉张兰兰李长文周水平
Owner TIANJIN TASLY GROUP
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