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Article

Experimental Study and Mathematical Modeling of a Glyphosate Impedimetric Microsensor Based on Molecularly Imprinted Chitosan Film

1
University of Lyon, Institute of Analytical Sciences, 69100 Villeurbanne, France
2
Faculty of Technology, University of Bejaia, Bejaia 06000, Algeria
3
CSIC, CNM, IMB, Campus UAB, 08193 Barcelona, Spain
*
Authors to whom correspondence should be addressed.
Chemosensors 2020, 8(4), 104; https://doi.org/10.3390/chemosensors8040104
Received: 12 September 2020 / Revised: 15 October 2020 / Accepted: 16 October 2020 / Published: 20 October 2020
(This article belongs to the Special Issue Chitosan for Sensors and Electrochemical Applications)
A novel impedimetric microsensor based on a double-layered imprinted polymer film has been constructed for the sensitive detection of the herbicide, glyphosate (GLY), in water. It is based on electropolymerized polypyrrole films, doped with cobaltabis(dicarbollide) ions ([3,3′-Co(1,2-C2B9H11)2]), as a solid contact layer between the gold microelectrode surface and the molecularly imprinted chitosan film (CS-MIPs/PPy/Au). Electrochemical Impedance Spectroscopy (EIS) was used for the characterization of the CS-molecular imprinted polymers (MIPs)/PPy/Au in the presence of GLY concentrations between 0.31 pg/mL and 50 ng/mL. Experimental responses of CS-MIPs/PPy/Au are modeled for the first time using an exact mathematical model based on physical theories. From the developed model, it was possible to define the optimal range of the parameters that will impact the quality of impedance spectra and then the analytical performance of the obtained microsensor. The obtained microsensor shows a low detection limit of 1 fg/mL (S/N = 3), a good selectivity, a good reproducibility, and it is regenerable. View Full-Text
Keywords: Glyphosate; polypyrrole; molecularly imprinted polymer; chitosan; electrodeposition; impedimetric micro-sensor; mathematical modeling Glyphosate; polypyrrole; molecularly imprinted polymer; chitosan; electrodeposition; impedimetric micro-sensor; mathematical modeling
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MDPI and ACS Style

Zouaoui, F.; Bourouina-Bacha, S.; Bourouina, M.; Alcacer, A.; Bausells, J.; Jaffrezic-Renault, N.; Zine, N.; Errachid, A. Experimental Study and Mathematical Modeling of a Glyphosate Impedimetric Microsensor Based on Molecularly Imprinted Chitosan Film. Chemosensors 2020, 8, 104. https://doi.org/10.3390/chemosensors8040104

AMA Style

Zouaoui F, Bourouina-Bacha S, Bourouina M, Alcacer A, Bausells J, Jaffrezic-Renault N, Zine N, Errachid A. Experimental Study and Mathematical Modeling of a Glyphosate Impedimetric Microsensor Based on Molecularly Imprinted Chitosan Film. Chemosensors. 2020; 8(4):104. https://doi.org/10.3390/chemosensors8040104

Chicago/Turabian Style

Zouaoui, Fares, Saliha Bourouina-Bacha, Mustapha Bourouina, Albert Alcacer, Joan Bausells, Nicole Jaffrezic-Renault, Nadia Zine, and Abdelhamid Errachid. 2020. "Experimental Study and Mathematical Modeling of a Glyphosate Impedimetric Microsensor Based on Molecularly Imprinted Chitosan Film" Chemosensors 8, no. 4: 104. https://doi.org/10.3390/chemosensors8040104

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