WHAT ARE TANNINS

TANNINS ARE POLYHYDROXY PHENOLS

INTRODUCTION: -
The term TANNIN was first applied in 1796 to denote the substances present in plant extracts, which were able to combine with proteins of animal, hides, prevent their putrefaction and convert them into leather.
DEFINITION: -
Tannins are complex substances that usually occur as mixtures of polyphenols that are very difficult to separate since they do not crystallize.
OCCURRENCE: -
Tannins are usually distributed through out the plant kingdom and localized in specific plant parts such as roots, leaves barks and stems. They are found in greatest quantity in dead or dying cells.