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Peroxynitrite sensor based on a screen printed carbon electrode modified with a poly(2,6-dihydroxynaphthalene) film

Sensors (Switzerland), ISSN: 1424-8220, Vol: 16, Issue: 11, Page: 1975
2016
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Article Description

For the first time the electropolymerization of 2,6-dihydroxynaphthalene (2,6-DHN) on a screen printed carbon electrode (SPCE) was investigated and evaluated for peroxynitrite (PON) detection. Cyclic voltammetry was used to electrodeposit the poly(2,6-DHN) on the carbon electrode surface. The surface morphology and structure of poly(2,6-DHN) film were investigated by SEM and FTIR analysis, and the electrochemical features by cyclic voltammetry. The poly(2,6-DHN)/SPCE sensor showed excellent electrocatalytic activity for PON oxidation in alkaline solutions at very low potentials (0–100 mV vs. Ag/AgCl pseudoreference). An amperometric FIA (flow injection analysis) system based on the developed sensor was optimized for PON measurements and a linear concentration range from 2 to 300 µM PON, with a LOD of 0.2 µM, was achieved. The optimized sensor inserted in the FIA system exhibited good sensitivity (4.12 nA·µM), selectivity, stability and intra-/inter-electrode reproducibility for PON determination.

Bibliographic Details

Hosu, Ioana Silvia; Constantinescu-Aruxandei, Diana; Jecu, Maria-Luiza; Oancea, Florin; Badea Doni, Mihaela

MDPI AG

Chemistry; Computer Science; Physics and Astronomy; Biochemistry, Genetics and Molecular Biology; Engineering

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