Abstract
The study included extraction of tannic acid from grape seeds and pomegranate peels , their content of tannic acid were 4.1 and 27.6 g/100g ( dry weight), respectively .The quality tests which done on extracted tannic acid from both sources showed positive results, where the increasing tannic acid concentration leads to increase killing effect on studied microorganisms especially at highest concentration (2%) .These results showed that extracted tannic acid from both sources can be used as preservation material in food processing and component of cosmetic materials and pharmacological drugs.
