Process optimization of γ-aminobutyric acid from germinated brown rice by circulating countercurrent extraction method

By using water as extraction solvent,the laboratory simulation of dynamic countercurrent extraction method and response surface experimental design method were used for optimizing process conditions ofγ-aminobutyric acid from germinated brown rice. The experimental results showed that the optimal extraction conditions were single stage extraction time for 59 min at 51℃,a liquid material ratio 5.9∶1(m L/g) and extracted from the series 3. Under this conditions,the average extraction rate of GABA could reach 89.35%。