Digallic acid is a polyphenolic compound found in ''

Pistacia lentiscus ''Pistacia lentiscus'' (also lentisk or mastic) is a dioecious evergreen shrub or small tree of the genus '' Pistacia'' native to the Mediterranean Basin. It grows up to tall and is cultivated for its aromatic resin, mainly on the Greek isl ...

''. Digallic acid is also present in the molecule of

tannic acid Tannic acid is a specific form of tannin, a type of polyphenol. Its weak acidity (Acid dissociation constant, pKa around 6) is due to the numerous phenol groups in the structure. The chemical formula for commercial tannic acid is often given as ...

. Digalloyl esters involve either ''-meta,'' or ''-para''

depside A depside is a type of polyphenolic compound composed of two or more monocyclic aromatic units linked by an ester group. Depsides are most often found in lichens, but have also been isolated from higher plants, including species of the Ericaceae, ...

bonds. Tannase is an enzyme that uses digallate to produce

gallic acid Gallic acid (also known as 3,4,5-trihydroxybenzoic acid) is a trihydroxybenzoic acid with the formula C6 H2( OH)3CO2H. It is classified as a phenolic acid. It is found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plant ...

. This enzyme can also be used to produce digallic acid from gallotannins.

References

Gallotannins Trihydroxybenzoic acids Gallate esters Benzoate esters {{aromatic-stub