The Contents of L-Theanine and Free L-Glutamic Acid in the Shizuoka Tea

概要

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By examing the contents of theanine, glutamic acid, total nitrogen and tannin in the first, second and third crops of tea produced in 20 representative tea-producing districts in Shizuoka-Ken, we have found the following facts:<BR>1. A fact has been found that the better the qualities of the tea examined the more theanine. glutamic acid and total nitrogen are contained in it, consequently the qualities of tea are closely related with the above mentioned components.<BR>2. The percentage of glutamic acid and total nitrogen decreased in proportion with the plucking season.<BR>3. A great difference is perceptible as to the percentage of theanine contained depending on the districts.<BR>4. The percentage of tannin contained has shown an increase in proportion with the plucking periods.
日本茶業技術協会の論文