Contents of Tea Leaves Soaked in Water

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  • 茶葉の水中浸漬処理における内容成分について
  • チャバ ノ スイチュウ シンシ ショリ ニ オケル ナイヨウ セイブン ニ ツイテ

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Abstract

γ-Aminobutyric acid (GABA), caffeine and pheophorbide-a of tea leaves soaked in water were analyzed. <br>1) The amounts of GABA increased over 1.5mg/g by soaking them in water for 6 hours in the first crop of tea leaves, and for 15 hours in the second crop of tea leaves. <br>2) The amount of caffeine had a tendency to decrease by soaking them in water. <br>3) The amount of pheophorbide-a increased by soaking them in water. <br>4) The amount of GABA in crude tea produced by soaking in water for 15 hours was 1.61mg/g～2.80mg/g for the first crop of tea and 1.60mg/g for the second crop of tea. However a particularly offensive odor was observed in every crop. <br>5) The result of this study showed that the amounts of GABA were increased by soaking in water, but caffeine decreased. It became clear that the amount of pheophorbide-a in water soaked tea leaves was less than the standard value established in processed chlorella.

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