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Gamma aminobutyric acid (GABA), also known as 4-aminobutyric acid, is a four carbon non protein amino acid. Its molecular formula is C4H9NO2, with a molecular weight of 103.12. It is usually a white or nearly white crystalline powder, with a slightly bitter taste, a slightly unpleasant odor, and no optical activity. It is highly soluble in water and slightly soluble in hot ethanol. Its saturation solubility at 25 ° C is 774.49g/L, and its solubility hardly changes with temperature. It is insoluble in other organic solvents such as cold ethanol, ether, and benzene. [17] The thermal decomposition temperature of gamma aminobutyric acid is 202~204 ° C, and the thermal decomposition products are water and pyrrolidone. The structure is very stable at room temperature. This product has the common properties of amino acids and contains characteristic functional groups (amino, carboxyl). It is a zwitterionic dissociation substance with an isoelectric point of approximately 7.2.