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Theogallin is a trihydroxybenzoic acidglycoside, a type of polyphenolic compound found in tea where it has been characterised as an umami enhancing compound. The compound can also be found in Arbutus unedo fruits.
In rats, theogallin, or its metabolite quinic acid, can move through the blood brain barrier and can have cognition enhancing activities.
References
Cartwright, R. A.; Roberts, E. A. H. (1954). "Theogallin, a polyphenol occurring in tea". Journal of the Science of Food and Agriculture. 5 (12): 593. doi:10.1002/jsfa.2740051207.
Kaneko, S; Kumazawa, K; Masuda, H; Henze, A; Hofmann, T (2006). "Sensory and structural characterisation of an umami enhancing compound in green tea (mat-cha)". Flavour Science - Recent Advances and Trends. Developments in Food Science. Vol. 43. p. 181. doi:10.1016/S0167-4501(06)80043-9. ISBN978-0-444-52742-4.