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Biosensors 2016, 6(3), 46; doi:10.3390/bios6030046

Electrochemical Sensors Based on Screen-Printed Electrodes: The Use of Phthalocyanine Derivatives for Application in VFA Detection

1
Clermont Université, Université Blaise Pascal, Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France
2
CNRS, UMR 6602, Institut Pascal, Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, 63178 Aubiere Cedex, France
*
Author to whom correspondence should be addressed.
Academic Editors: Donatella Albanese and Roberto Pilloton
Received: 30 May 2016 / Revised: 4 August 2016 / Accepted: 25 August 2016 / Published: 1 September 2016
(This article belongs to the Special Issue Screen-Printed Electrodes and Sensors)
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Abstract

Here, we report on the use of electrochemical methods for the detection of volatiles fatty acids (VFAs), namely acetic acid. We used tetra-tert-butyl phthalocyanine (PcH2-tBu) as the sensing material and investigated its electroanalytical properties by means of cyclic voltammetry (CV) and square wave voltammetry (SWV). To realize the electrochemical sensing system, the PcH2-tBu has been dropcast-deposited on carbon (C) orgold (Au)screen-printed electrodes (SPEs) and characterized by cyclic voltammetry and scanning electron microscopy (SEM). The SEM analysis reveals that the PcH2-tBu forms mainly aggregates on the SPEs. The modified electrodes are used for the detection of acetic acid and present a linear current increase when the acetic acid concentration increases. The Cmodified electrode presents a limit of detection (LOD) of 25.77 mM in the range of 100 mM–400 mM, while the Aumodified electrode presents an LOD averaging 40.89 mM in the range of 50 mM–300 mM. When the experiment is realized in a buffered condition, theCmodified electrode presents a lower LOD, which averagesthe 7.76 mM. A pronounced signal decay attributed to an electrode alteration is observed in the case of the gold electrode. This electrode alteration severely affects the coating stability. This alteration is less perceptible in the case of the carbon electrode. View Full-Text
Keywords: dropcast-deposition; metal-free phthalocyanine; acetic acid; CV; SWV dropcast-deposition; metal-free phthalocyanine; acetic acid; CV; SWV
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ndiaye, A.L.; Delile, S.; Brunet, J.; Varenne, C.; Pauly, A. Electrochemical Sensors Based on Screen-Printed Electrodes: The Use of Phthalocyanine Derivatives for Application in VFA Detection. Biosensors 2016, 6, 46.

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