How Is Gallotannin Made?

A gallotannin is a class of molecules belonging to the hydrolysable tannins. Gallotannins are polymers formed when gallic acid esterifies and binds with glucose (Miranda et al. 1996).

What are galloyl groups?

The galloyl groups at positions 1, 2, 3, 4 of glucose and all the five galloyl groups at positions 1, 2, 3, 4, 6 of β-PGG are essential for antidiabetic activity. If any of galloyl group from these positions is removed, the resulting galloyl esters lack the bioactivity in both α- and β-anomeric forms of glucose.

What is gallotannic acid?

Gallotannins are natural polymers formed by the subsequent esterification of hydroxyl groups of D-glucose and gallic acid in polymeric chains, in which the galloyl moieties are linked by so called “depside” bonds.