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Extraction method of theanine

An extraction method, theanine technology, applied in the separation/purification of carboxylic acid amide, organic chemistry, etc., can solve the problems affecting industrial promotion and many extraction steps, and achieve the effect of simple steps

Active Publication Date: 2015-11-18
CHANGSHA BOTANIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the extraction steps of the method are numerous, which affects the industrial promotion of the method

Method used

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Embodiment

[0030] Use the waste liquid extracted from tea polyphenols as raw material, and remove macromolecular substances such as protein and polysaccharide through ceramic membrane ultrafiltration (membrane aperture 50nm, 0.35MPa); according to the amount of ceramic membrane filtrate, add 1% of its weight- 5% basic copper carbonate, fully stirred and reacted to generate theanine-basic copper carbonate precipitation; high-speed centrifugation (8000-10000r / min, 5-10min), discard the filtrate, and use 2-5 times deionized water for the filter residue Washing; the precipitate is dissolved with 5-8 times of 0.5-1.3mol / L dilute sulfuric acid to generate a theanine-copper sulfate mixture; the mixture is electrodialyzed to remove inorganic salts such as copper sulfate dissolved in the solution, Discard the liquid in the concentrated water chamber and collect the liquid in the fresh water chamber for future use. Concentrate the liquid in the fresh water room under reduced pressure to a specific...

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Abstract

The invention provides an extraction method of theanine. The extraction method comprises the steps of ultrafiltration, precipitation, dissolution, electroosmosis, vacuum concentration, ethanol addition, sulfuric acid removal and the like. Specifically, the extraction method comprises the steps that after the ultrafiltration is performed on waste liquid to remove macromolecular substances, basic cupric carbonate reacts with theanine to generate theanine-basic cupric carbonate precipitation, then dilute sulphuric acid reacts with theanine-basic cupric carbonate to generate theanine-bluestone, then copper ions and sulfate ions in the theanine-bluestone are simultaneously removed through the electroosmosis, then moisture in a fresh water chamber is removed through vacuum concentration, and then sulfuric acid is separated from sulfuric acid-theanine by using absolute ethyl alcohol. The invention provides a simple method for extracting the theanine from the waste liquid after tea polyphenol is extracted from tea on the premise that substances such as sulfuretted hydrogen, barium hydroxide are not used, and the concentration of the theanine in theanine crude products reaches 70 to 90%.

Description

technical field [0001] The invention relates to a method for extracting theanine, in particular to a method for extracting theanine from waste liquid after extracting tea polyphenols from tea leaves. Background technique [0002] Tea polyphenols and theanine are two organic compounds commonly found in tea. Among them, tea polyphenols (TeaPolyphenols) is the general term for polyphenols in tea, including flavanols, anthocyanins, flavonoids, flavonols and phenolic acids. It is mainly flavanols (catechins), and catechins account for 60-80%. Tea polyphenols, also known as tea tannin or tea tannin, are one of the main components that form the color and aroma of tea, and are also one of the main components that have health care functions in tea. Studies have shown that active substances such as tea polyphenols have detoxification and anti-radiation effects, can effectively prevent radioactive substances from invading bone marrow, and can quickly excrete strontium 90 and cobalt 6...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C237/06C07C231/24
Inventor 廖梅生高敬铭
Owner CHANGSHA BOTANIX
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