Electrocatalysis of Poly-thionine Modified Microband Gold Electrode for Oxidation of Reduced Nicotinamide Adenine Dinucleotide

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (3): 368.

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Electrocatalysis of Poly-thionine Modified Microband Gold Electrode for Oxidation of Reduced Nicotinamide Adenine Dinucleotide

CAI Chen-Xin, JU Huang-Xian, CHEN Hong-Yuan

Department of Chemistry, Nanjing University, Nanjing 210093

Received:1994-04-07 Revised:1994-07-15 Online:1995-03-24 Published:1995-03-24

Abstract

Abstract: The electrocatalytic oxidation of NADH in phosphate buffer solution (pH=7.0)by poly-thionine modified microband gold electrode was investigated.The electrochemical polymerization of thionine in acetonitrile solution and the properties of the resulting films were studied.It was found that the addition of acids such as CF₃COOH to the medium markedly facilitates the film formation.The poly-thionine film was characterized by IR spectra.Two redox couple of poly-thionine in the potential range of -0.7─+0.5 V (vs.SCE)were observed,one of them possesses the monomer-type activity.The peak potentials are E_pc¹=-0.03 V,E_pa¹=0.05 V;E_pc¹=-0.24 Vand E_pa¹=-0.17 V (vs.SCE,25℃). Aslope of-29 mV/pH for the plot of E^ovs. pHwas observed in acidic solution,whereas in alkaline solution the slope was -56 mV/pH.

Key words: Nicotinamide adenine dinucleotide, Thionine, Chemically modified electrode, Microband gold electrode, Electrocatalysis

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CAI Chen-Xin, JU Huang-Xian, CHEN Hong-Yuan . Electrocatalysis of Poly-thionine Modified Microband Gold Electrode for Oxidation of Reduced Nicotinamide Adenine Dinucleotide[J]. Chem. J. Chinese Universities, 1995, 16(3): 368.

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Electrocatalysis of Poly-thionine Modified Microband Gold Electrode for Oxidation of Reduced Nicotinamide Adenine Dinucleotide

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