NURSING ANM AND GNM

Detailed explanation-1: -The term tannin was first time coined by Seguin in 1796. This term was used to denote substances present in plant extract which react with protein of animal hide, prevent their putrefaction and convert hide and skin into leather.

Detailed explanation-2: -In the early of the 20th century synthetic tannins, based on different organic molecules, were introduced in leather industry with the purpose of aiding vegetable tanning [1, 7].

Detailed explanation-3: -Proanthocyanidins (PAs), also known as condensed tannins, are phenolic polymers composed of flavan-3-ol or flavan-3, 4-diol units. PAs can be degraded and oxidized to produce anthocyanins by heating in an acidic medium. Hence, they are called proanthocyanidins.