Evaluation of Antioxidant Activity by Electrochemical and Chemical Methods, Kinetics and Thermodynamic Parameters of Superoxide Anion Radical towards Cupressus sempervirens L. Extracts

IF 0.7 4区材料科学 Q4 ELECTROCHEMISTRY

Journal of New Materials For Electrochemical Systems Pub Date : 2022-03-31 DOI:10.14447/jnmes.v25i1.a08

Zineb Rahmani, A. Belfar, Tatou Touahria, Chayma Bensaci, Z. Rahmani, Messaouda Dekmouche, M. Saidi, A. Douadi

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引用次数: 2

Abstract

For the first time in this report, we determined the antioxidative capacity of Cupressus sempervirens extracts by using two methods such as inhibition of superoxide anion (0∙−2) made by alkaline pyrogallol, and electrochemical generation of this radical. We have studied the O2/0∙−2 redox couple on the GC in DMF. We obtained well-resolved quasireversible and reproducible cyclic voltammograms for the O2/O∙−2 redox couple. A ipaipc value of 0.96 and ΔEp value of 160 mV for scan rates 0.1 V/s were obtained. In addition, the standard electrochemical rate constant k∘ is 2.31×10−3 cm s−1; all these characteristics clearly show that the system is quasi-reversible. Furthermore, we have used the cyclic voltammetric to study the antioxidant capacity of Cupressus sempervirens extracts. The thermodynamic feasibility of the radical scavenging by extracts was accounted in term of standard free energy ΔG∘, which ranged from -8.934 to 0.042 kJ/mol.

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电化学和化学方法评价超氧化物阴离子自由基对咖啡提取物的抗氧化活性及动力学和热力学参数

本文首次采用碱性邻苯三酚抑制超氧阴离子(0∙−2)和电化学生成超氧阴离子两种方法测定了柏树提取物的抗氧化能力。我们在DMF的GC上研究了O2/0∙−2氧化还原对。我们获得了O2/O∙−2氧化还原对的高分辨率、准可逆和可重复的循环伏安图。扫描速率为0.1 V/s时，ipaipc值为0.96，ΔEp值为160 mV。另外，标准电化学速率常数k°为2.31×10−3 cm s−1;这些特征清楚地表明系统是准可逆的。此外，我们还利用循环伏安法研究了柏树提取物的抗氧化能力。萃取物清除自由基的热力学可行性用标准自由能ΔG°来表示，其范围从-8.934到0.042 kJ/mol。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of New Materials For Electrochemical Systems ELECTROCHEMISTRY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

1.90

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： This international Journal is intended for the publication of original work, both analytical and experimental, and of reviews and commercial aspects related to the field of New Materials for Electrochemical Systems. The emphasis will be on research both of a fundamental and an applied nature in various aspects of the development of new materials in electrochemical systems.