Development of effective accumulation method of gamma-aminobutyric acid in fresh tea [Camellia sinensis] leaves
2001
Shiraki, Y. (Kanagawa-ken. Agricultural Research Inst., Hiratsuka (Japan))
A new type of tea, fresh tea leaves irradiated with infrared rays, under a water soak method and under sodium glutamate solution saok method, was developed. This new tea has been found that it has accumulated as much gamma-aminobutyric acid (GABA) as Gabaron tea. 1. There was a tendency for the amount of GABA to be increased with the lapse of water sacking time and sodium glutamate solutoin soaking time. The GABA content of the first crop of green leaves was 2.4mg/g to 3.4mg/g; that of the second crop of green leaves was 1.5mg/g to 2.8mg/g. 2. There was a tendency for the amount of GABA to be increased with sodium glutamate concentration. The content of the first crop of green leaves was 2.6mg/g to 4.3mg/g; that of the second crop of green leaves was 2.3mg/g to 4.9mg/g. 3. There was a tendency for the amount of GABA to be increased by fresh leaves primary drying treatment without increasing temperature. The GABA content of the first crop of green leaves two hours later was 2.1mg/g. 4. The amounts of GABA and alanine were also increased by the use of same methods. However that of aspartic acid and glutamic acid were decreased. 5. The result of this study shows that it is possible to increase the amount of GABA in tea leaves by means of water soak treatement, sodium glutamate solution soak treatment with infrared rays irradiation and primary drying treatement. It suggested that the increase of the amount of GABA was due to rise of gultamic acid decarboxylase activity.
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