Studies on dhava tannins. I. The isolation and constitution of a gallotannin from dhava (Anogeissus latifolia)

Abstract

The isolation and purification of a gallotannin from dhava, an indigenous leaf-tanning plant, is described. The gallotannin from analysis and other degradative studies was found to be an octa- or nonagalloylated glucose. The glucose core of the tannin is established by hydrolysis experiments using alkali. Further, by methanolysis and other reactions it was shown that the tannin contains a β-penta-O-galloylated glucose to which chains containing at least three galloyl groups are attached.