Erythrocytes samples were analyzed for superoxide dismutase (SOD) activity with a SOD
Assay Kit (RANSOD, RANDOX, United Kingdom). The methodology used in the kit described
by Woolliams et al. (1983). This method employs xanthine and xanthine oxidase (XOD) to
generate superoxide radicals which react with 2-(4-iodophenyl)-3-(4-nitrophenol)-5- phenyltetrazolium chloride (INT) to form a red formazan dye, which measured by
Photometer. The superoxide dismutase activity is then measured by the degree of inhibition...
reduction of INT under the conditions of the assay.