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Sensors 2011, 11(11), 10166-10179; doi:10.3390/s111110166

Electrocatalytic Oxidation of Ascorbic Acid Using a Poly(aniline-co-m-ferrocenylaniline) Modified Glassy Carbon Electrode

1
Department of Chemistry and Centre for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Warinchamrap, Ubon Ratchathani 34190, Thailand
2
NANOCAST Laboratory, Centre for Catalysis, Department of Chemistry and Centre for Innovation in Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
*
Author to whom correspondence should be addressed.
Received: 10 August 2011 / Revised: 19 September 2011 / Accepted: 24 October 2011 / Published: 26 October 2011
(This article belongs to the Section Chemical Sensors)
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Abstract

A poly(aniline-co-m-ferrocenylaniline) was successfully synthesized on a glassy carbon electrode (GCE) by electrochemical copolymerization using a scan potential range from −0.3 to +0.9 V (vs. Ag/AgCl) in 0.5 M H2SO4 containing 30% acetonitrile (ACN), 0.1 M aniline (Ani) and 0.005 M m-ferrocenyaniline (m-FcAni). The field emission scanning electron microscope (FESEM) and electrochemical methods were used to characterize the poly(Ani-co-m-FcAni) modified electrode. The poly(Ani-co-m-FcAni)/GCE exhibited excellent electrocatalytic oxidation of ascorbic acid (AA) in citrate buffer solution (CBS, pH 5.0). The anodic peak potential of AA was shifted from +0.55 V at the bare GCE to +0.25 V at the poly(Ani-co-m-FcAni)/GCE with higher current responses than those seen on the bare GCE. The scan number at the 10th cycle was selected as the maximum scan cycle in electrochemical polymerization. The limit of detection (LOD) was estimated to be 2.0 mM based on the signal-to-noise ratio (S/N = 3). The amperometric responses demonstrated an excellent selectivity for AA determination over glucose (Glu) and dopamine (DA).
Keywords: electrochemical copolymerization; poly(aniline-co-m-ferrocenylaniline); electrocatalytic oxidation; ascorbic acid (AA) electrochemical copolymerization; poly(aniline-co-m-ferrocenylaniline); electrocatalytic oxidation; ascorbic acid (AA)
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MDPI and ACS Style

Chairam, S.; Sriraksa, W.; Amatatongchai, M.; Somsook, E. Electrocatalytic Oxidation of Ascorbic Acid Using a Poly(aniline-co-m-ferrocenylaniline) Modified Glassy Carbon Electrode. Sensors 2011, 11, 10166-10179.

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