Amperometric ascorbate sensor based on conducting polymer: Poly( N-methylaniline) versus polyaniline
Electrocatalytic oxidation of ascorbate (vitamin C) at poly( N-methylaniline) modified electrode has been studied and compared with that proceeding at polyaniline modified sensor. A sigmoid-shaped anodic current transient as a response to addition of ascorbate was found for polyaniline modified elec...
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Veröffentlicht in: | Electrochimica acta 2007-12, Vol.53 (2), p.785-791 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Electrocatalytic oxidation of ascorbate (vitamin C) at poly(
N-methylaniline) modified electrode has been studied and compared with that proceeding at polyaniline modified sensor. A sigmoid-shaped anodic current transient as a response to addition of ascorbate was found for polyaniline modified electrode in pH-neutral solution, whereas a ‘normal-shaped’ current transient was found to be characteristic for poly(
N-methylaniline) modified electrode. Based on this, a hypothesis on the autocatalytic mechanism for electrochemical oxidation of ascorbate was confirmed. It has been shown that poly(
N-methylaniline) modified electrode can be used as an amperometric ascorbate sensor, operating in slightly acidic or pH-neutral buffer solutions at a controlled potential of 0.1–0.5
V versus Ag/AgCl, and the dependencies of current response on ascorbate concentration, the thickness of a polymer layer, and operating potential have been analyzed. |
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ISSN: | 0013-4686 1873-3859 |
DOI: | 10.1016/j.electacta.2007.07.054 |