Study of Antioxidant and Free Radical Scavenging Activities of Cotoneaster medicus and Glycyrrhiza glabra Plants

الموضوعات :

M. M. Heravi ¹ (Department of Chemistry , Mashhad Branch , Islamic Azad university, Mashhad, Iran)
S. Rodi ² (Department of Chemistry , Mashhad Branch , Islamic Azad university, Mashhad, Iran)
P. Ardalan ³ (Young Researchers Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran)

تاريخ الإرسال : 17 السبت , شوال, 1434 تاريخ التأكيد : 20 الإثنين , صفر, 1440 تاريخ الإصدار : 22 السبت , رجب, 1434

الکلمات المفتاحية: Antioxidant Activity, DPPH, Glycyrrhiza glabra, Cotoneaster medicus, Rate constant, activation energy,

ملخص المقالة :

Extracts of Cotoneaster medicus, Glycyrrhiza glabra, as endemic plants of Iran, along with mixture of them were investigated for their antioxidant activities using 2, 2- diphenyl-1-picrylhidrazyl (DPPH) reagent. UV-Vis spectrophotometry method was used to evaluate the ability of Cotoneaster and Glycyrrhiza glabra antioxidant 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 (k1), in the presence of C. medicus and G. glabra antioxidant were obtained under pseudo-first-order conditions at different temperatures. The order in DPPH radical-scavenging was: mixture of C. medicus and G. glabra > C. medicus > G.  glabra plants. The numerical values of activation energy were found to be 45.84 kJ.mol-1for G. glabra and 62.02kJ.mol-1 for C. medicus.

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