Author/Authors :
0، 0 0 نويسنده Department of Chemistry, Islamic Azad University, Momen Heravi, M. , 0، 0 0 نويسنده Department of Chemistry, Islamic Azad University, Haghi, B. , 0، 0 0 نويسنده Department of Chemistry, Islamic Azad University, Morsali, A. , 0، 0 0 نويسنده Department of Chemistry, Islamic Azad University, Ardalan, P. , 0، 0 0 نويسنده Department of Chemistry, Islamic Azad University, Ardalan, T.
Abstract :
Reactions of free radicals and reactive oxygen species (ROS) with biological molecules in vivo play an important physiological role in many diseases. 2,2-diphenyl-1-picrylhydrazyl (DPPH) is a stable free radical and often used as a routine reagent to evaluate the antioxidant capacity of an antioxidant. This study was undertaken to investigate the free radical-scavenging and antioxidant activities of Zinc, Vitamin C and mixture of them. UV-Vis spectrophotometry method was used to evaluate the ability of Zinc, Vitamin C and mixture of them to scavenge DPPH radical. The kinetic parameters such as rate constant and activation energy in experimental conditions were calculated. The rate constants of the H atom abstraction by DPPH (), in the presence of Zinc, Vitamin C and mixture of them were obtained (0.4209, 2.092 and 1.82 min-1) respectively, under pseudo-first-order conditions at 25 oC.
