Addition of Sodium Glutamate Solution
Nesumi105 reported a method to increase the GABA content in manufactured tea by soaking fresh tea leaves in sodium glutamate solution combined with infrared irradiation . The GABA content could increase to 2 . 89 mg/g and 2 . 81 mg/g for spring and summer teas, respectively, after soaking in water for 3 hr and treating with infrared irradiation, as compared with the increases of 1 . 6 mg/g and 1 .43 mg/g for spring and summer teas, respectively, after soaking in water for 3 hr but with no irradiation . Using sodium glutamate solution to replace water, the GABA content in GABA tea treated with sodium glutamate and infrared irradiation became 1 .7- to 2 .7-fold higher than that with sodium glutamate but without irradiation This indicates that treatment with sodium glutamate solution did enhance the increase of GABA content in the manufactured GABA tea, especially together with infrared irradiation
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