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Abstract
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Medicinal plants and their extracts deserve special attention because of the vital influence they have on human health. For the majority of the world population, medicinal plants represent the primary source of health care [1]. On the other hand, electrochemical evaluations are useful for the determination of antioxidant activity for example, their application as a rapid evidence of the antioxidant capacity of many organic compounds. The oxidation potentials measured by cyclic voltammetry (CV) used to compare the antioxidant strength of phenolic acids, flavonoids, cinnamic acids as natural compounds in medicinal plants. [2] Papaver rhoeas L. (family: Papaveraceae) is commonly known as corn poppy and found wild in various parts of the world. Papaver rhoeas L. has a long history of medicinal usage. Extracts derived from this plant have been used for the treatment of a wide range of diseases including inflammation, diarrhea, sleep disorders, cough, analgesia and also the reduction of withdrawal signs of the opioid addiction [3]. In the present work the electrochemical oxidation of etanolic leaf papaver rhoeas L. extract has been investigated by cyclic voltammetry and differential pulse voltammetry techniques in the biological pH at the surface of glassy carbon electrode at various concentrations and scan rates. The results revealed that the extract had a quasi-reversible redox reaction. Our results show that papaver rhoeas L. extract oxidize at low potentials in comparison of quercetin, gallic acid and salicylic acid as standard antioxidants. Antioxidant activities of this extract was evaluated using the 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging method and it is directly related to its redox potential value. The results show the good antioxidant activity of the papaver rhoeas L. extract and the electrochemical behavior of the constituents in it, at the surface of glassy carbon electrode.
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