Process for preparing theanine

Abstract

The industrial theanine preparing process includes the reaction between L-pyrrolidone carboxlic acid aqua and anhydrous ethylamine under certain pressure, pressure relief, dissolving in water to obtain water solution of theanine, unreacted ethylamine and other reactant; alcohol precipitation of the water solution, separation to obtain crude theanine and alcohol solution, separating alcohol solution in cationic exchange column; water elution of the exchange column to obtain eluted liquid A, concentrating liquid A and drying to obtain L-pyrrolidone carboxlic acid; ammonia water elution of exchange column to obtain eluted liquid B, concentrating liquid B and drying to obtain theanine product. The said process has the advantages of simple process, high yield, environment friendship, etc.

Description

Technical field: [0001] The utility model relates to a preparation method of theanine. Background technique: [0002] Theanine (Theanine) system is named N-ethyl-L-glutamine, which is a characteristic amino acid in tea, and its content is positively correlated with the taste and grade of tea (r=0.789-0.867). Theanine has been confirmed by the U.S. Food and Drug Administration (FDA) as GRAS (Generally Recognized Safe Substance) (1985). Japan and other countries have begun to add synthetic theanine to green tea in recent years. Beverages and other products are artificially flavored to improve the taste of medium and low-grade tea and its products. In recent years, it has been found that theanine has obvious medicinal functions: it can relieve muscle or nervous tension, effectively reduce the death rate of gastric cancer, inhibit skin cancer, prostate cancer and other functions. Developed countries such as the United States and Japan use theanine It is developed as a healthy ...

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