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2012•Journal of Yunnan University of NationalitiesRequires access

Micro-Electrochemical Titration Analysis of the Scavenging Effect of Gallic Acid on DPPH Free Radicals

Zhou Xue-jin

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Abstract

The electrochemical results indicated that gallic acid presented typical irreversible oxidation processes,and an irreversible oxidation peak was observed with the peak potentials of 0.48V(vs.SCE) on the graphite electrode.A sensitive differential pulse voltammetry anodic peak at Epa= 0.38V(vs.SCE) was also detected with a good linear relationship between the peak current and the concentration: ipa = 2.408 c+3.028,r=0.999 6.A novel micro-electrochemical titration method for evaluating the scavenging effect of gallic acid on DPPH free radicals was proposed,the stoichiometric relationship of gallic and DPPH was determined with a stoichiometric proportion of 1∶ 3(gallic to DPPH),which was coincident with the results of spectrophotometry.Electrochemical oxidation mechanism of the scavenging effect of gallic acid on DPPH free radicals was also investigated.

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What this paper is about

The electrochemical results indicated that gallic acid presented typical irreversible oxidation processes,and an irreversible oxidation peak was observed with the peak potentials of 0.48V(vs.SCE) on the graphite electrode.A sensitive differential pulse voltammetry anodic peak at Epa= 0.38V(vs.SCE) was also detected with a good linear relationship between the peak current and the concentration: ipa = 2.408 c+3.028,r=0.999 6.A novel micro-electrochemical titration method for evaluating the scavenging effect of gallic acid on DPPH free radicals was proposed,the stoichiometric relationship of gallic and DPPH was determined with a stoichiometric proportion of 1∶ 3(gallic to DPPH),which was coincident with the results of spectrophotometry.Electrochemical oxidation mechanism of the scavenging effect of gallic acid on DPPH free radicals was also investigated.

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Available abstract

The electrochemical results indicated that gallic acid presented typical irreversible oxidation processes,and an irreversible oxidation peak was observed with the peak potentials of 0.48V(vs.SCE) on the graphite electrode.A sensitive differential pulse voltammetry anodic peak at Epa= 0.38V(vs.SCE) was also detected with a good linear relationship between the peak current and the concentration: ipa = 2.408 c+3.028,r=0.999 6.A novel micro-electrochemical titration method for evaluating the scavenging effect of gallic acid on DPPH free radicals was proposed,the stoichiometric relationship of gallic and DPPH was determined with a stoichiometric proportion of 1∶ 3(gallic to DPPH),which was coincident with the results of spectrophotometry.Electrochemical oxidation mechanism of the scavenging effect of gallic acid on DPPH free radicals was also investigated.

Key concepts: Gallic acid, Chemistry, DPPH, Electrochemistry, Titration, Radical, Inorganic chemistry, Stoichiometry

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