Theanine，activists in animals and plants

Many physiological functions of tea was confirmed by scientific, the health composition has aroused people's widespread interest. Research on tea polyphenols at the beginning of last century has made great achievements.In recent studies of other health ingredients of tea ,theanine is a more noticeable compound .

Theanine is one of the unique chemical components of tea  , aka N- ethyl - -L- glutamine, accounted for 50% in the total free amino acid of tea  and 1% to 2% of the dry weight of tea . Theanine is white needle crystal, solubling in water, with the sweet and fresh crisp taste, taste thresholds of 0.06%,which is the main component of tea fresh taste.

• metabolism in plants

  Theanine in tea root ,synthesis of glutamic acid and triethylamine which catalyzed by theanine synthetase, and then sendto the leaf through the branches, accumulating in the leaves. The first leaf and bud content in the highest, gradually reduce down. In the light irradiation theanine  will be decomposed into glutamic acid and ethylamine. Glutamate turns to nitrogen source, triethylamine was used for the synthesis of catechins after oxidated. The catabolism of shielding the light condition was inhibited in.

  Therefore, the content of Theanine in tea shade cultivation of higher. The opposite is the high content of polyphenols. Japanese Yulu, grinding tea (Matcha tea raw material) is the use of shading cultivation method to improve tea tea ammonia acid content.

• metabolism in animals

  Oral administration of theanine absorbed by brush border of intestinal mucosa . Uptaking mode is similar to glutamine  ,which need carrier depending on sodium ion , but the affinity lower  7 times than glutamine . Absorbed theanine rapidly into the blood and liver, these of brain, blood and liver  reached maximum in 1 hours before and after.  

  Theanine concentration in the brain  arrive the highest in 5 hours , then decreased gradually, which gone after 24 hours of these organizations .

  Site of metabolism of theanine is kidney, part in the kidney decomposed into triethylamine and glutamate excreted through the urine , another part direct ly discharge in vitro.