Theanine.

 Japanese green tea contains γ-glutamylethylamide, named theanine, at the level from 1 to 2 % in dried leafy materials. While most amino acids are found at lower level, theanine accounts for＞50 % of total free amino acids in tea. Theanine is the source of Japanese green tea’s characteristic delicious taste (known as“umami”). There is a scientific interest about the biological effect of theanine on central nervous system.

■Relaxation Effect:The relaxation feeling after drinking Japanese green tea may be linked with the presence of theanine. Studies on animals and human volunteers showed that oral administration of theanine generated α- waves in the brain, suggesting that theanine could bring about a relaxation feeling, because brain α- waves are generated under relaxing condition.



 
■ Effect on Blood Pressure: When theanine was orally administered to spontaneously hypertensive rats (SHR), their blood pressure was decreased in a dose dependent manner. However no reducing effect of theanine on the blood pressure of normal rats was observed.



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