Thermal properties of tannin extracted from Anacardium occidentale L. using TGA and FT-IR spectroscopy.

The chemical nature of the polyphenols of cashew kernel testa has been determined. Testa contains tannins, which present large molecular complexity and has an ancient use as tanning agents. The use of tannins extracted from cashew testa, considered in many places as a waste, grants an extra value to the cashew.