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Electrochemical Sensor for Simultaneous Measurement of Nitrite and Superoxide Anion Radical Using Superoxide Dismutase-Mimetic Manganese(III) Tetrakis(1-methyl-4-pyridyl)Porphyrin on Polypyrrole Matrix

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An electrochemical highly sensitive nitrite (NO 2 and superoxide anion radical (O•2 ) sensor was fabricated and developed based on an electrochemical deposition of manganese(III) tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP) in polypyrrole (PPy) matrix on Pt electrode. The surface morphological image of MnTMPyP-PPy and PPy matrix on Pt electrode was obtained by scanning electron microscopy exhibiting microporous structure. The electrochemical behavior of the MnTMPyP-PPy-Pt electrode as sensor investigated by cyclic voltammetry revealed that the characteristic of MnTMPyP reversible redox peaks obtained at –0.12 V and –0.38 V versus Ag/AgCl respectively. The sensor electrode showed an excellent electrocatalytic nitrite oxidase and superoxide dismutase (SOD) activities. This electrochemical sensor exhibited a linear current response over the concentration range from 0.8 to 1000 μM, with a detection limit of 0.8±0.03 μM for NO 2 and a corresponding linear range from 0.6 to 1000 μM, with a detection limit of 0.6 ± 0.02 μM for O•2 . In addition, the sensor displayed high sensitivity, good reproducibility and retained stability over a period of ∼4 weeks. This SOD-mimetic electrode was proved to be effective not only in detecting NO 2 and O•2 independently but also in determining the concentrations of NO – 2and O•2 simultaneously in in vitro systems.
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Document Type: Research Article

Publication date: 2011-10-01

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