Biological and anti-microbial activity of irradiated green tea polyphenols

Polyphenols of green tea leaf were separated and irradiated at 40 kGy to investigate the effect of irradiation on changes of biological and anti-microbial activities. The major antioxidative activities, including electron donating, inhibition of xanthine oxidase, metal ion chelating, and inhibition of lipid oxidation were maintained through irradiation, except for superoxide dismutase (SOD)-like activity at the 200 ppm level. The anti-microbial...