Theogallin
Encyclopedia
Theogallin is a trihydroxybenzoic acid
Trihydroxybenzoic acid
Trihydroxybenzoic acid may refer to the following phenolic acids :* Gallic acid * Phloroglucinol carboxylic acid O-methylated trihydroxybenzoic acids are :* Eudesmic acid* Syringic acid...

 glycoside
Glycoside
In chemistry, a glycoside is a molecule in which a sugar is bound to a non-carbohydrate moiety, usually a small organic molecule. Glycosides play numerous important roles in living organisms. Many plants store chemicals in the form of inactive glycosides. These can be activated by enzyme...

, a type of polyphenolic compound found in tea where it has been characterised as an umami
Umami
Umami , popularly referred to as savoriness, is one of the five basic tastes together with sweet, sour, bitter, and salty.-Etymology:Umami is a loanword from the Japanese meaning "pleasant savory taste". This particular writing was chosen by Professor Kikunae Ikeda from umai "delicious" and mi ...

 enhancing compound. The compound can also be found in Arbutus unedo fruits.

In rats, theogallin, or its metabolite quinic acid
Quinic acid
Quinic acid is a cyclitol, a cyclic polyol. It is a crystalline acid obtained from cinchona bark, coffee beans, and other plant products and made synthetically by hydrolysis of chlorogenic acid. Quinic acid is also implicated in the perceived acidity of coffee...

, can move through the blood-brain barrier and can have cognition enhancing activities.
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