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

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...

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Bibliographic Details
Published in:Chemosensors 2020-12, Vol.8 (4), p.104
Main Authors: Zouaoui, Fares, Bourouina-Bacha, Saliha, Bourouina, Mustapha, Alcacer, Albert, Bausells, Joan, Jaffrezic-Renault, Nicole, Zine, Nadia, Errachid, Abdelhamid
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemical Sciences
chitosan
electrodeposition
Environmental Engineering
Environmental Sciences
Glyphosate
impedimetric micro-sensor
molecularly imprinted polymer
Polymers
polypyrrole
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Summary: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.
ISSN:2227-9040
2227-9040
DOI:10.3390/chemosensors8040104