A molecularly imprinted electrochemical enzymeless sensor based on functionalized gold nanoparticle decorated carbon nanotubes for methyl-parathion detection

Abstract

Schematic of MP MIP sensor and the possible mechanism.

Molecularly imprinted polymers for the determination of organophosphorus pesticides in complex samples

“…For this field of application, the major attracting feature of MIPs is their high stability in real media: they can operate in acid or alkaline conditions, at high temperature in aqueous or organic media… Different types of sensors were developed for OPPs such as piezoelectric sensors (QCM, SPR), optical sensors (fluorescence) and electrochemical sensors that are the most reported sensors as illustrated by the works summarized in Table 4. One case excepted, the molecule chosen as template for sensor developments was the target molecule that has to be detected in samples when applying the sensor [40,42,[44][45][46][47]53,66,82,83,[85][86][87][88][89][90][93][94][95][96]. In a unique case, DMPTABA was used as template to develop a sensor able to determine the presence of two compounds, acephate and trichlorfon by the same sensor [63].…”

“…To reach low concentration level in water samples, a previous liquid-liquid extraction step was introduced to concentrate and transfer the target OPP in an adapted buffer [94,96]. Regarding vegetables, OPPs were previously extracted by water or an aqueous buffer [40,42,63,85] or an organic solvent [45,46] that can be further diluted with water or an appropriate buffer [66,82,87,90,93]. The repeatability of the preparation of the sensors was demonstrated by preparing 5 different electrodes for a sensor developed for methyl parathion with a RSD value of only 6.4% on the signal.…”

Layered Metal Nanoparticle Structures on Electrodes for Sensing, Switchable Controlled Uptake/Release, and Photo‐electrochemical Applications

“…A similar approach has applied to electron donor–acceptor interactions and hydrogen bonds to construct an imprinted Au NP matrix for the methyl parathion, ( 20 ), pesticide . Thioaniline‐functionalized Au NPs were electropolymerized in the presence of ( 20 ) on a high surface area carbon nanotube‐functionalized glassy carbon electrode modified with Au NP deposits ( Figure A).…”

“…B) Differential pulse voltammograms obtained upon the interaction of the ( 21 )‐imprinted bis aniline‐crosslinked Au NPs electrode with variable concentrations of ( 21 ): a) 0, b) 1 × 10 −8 , c) 1 × 10 −4 M, and d) before the removal of the ( 21 ) template. Reproduced with permission . Copyright 2011, Elsevier.…”

“…1, 51-75 A similar approach has applied to electron donoracceptor interactions and hydrogen bonds to construct an imprinted Au NP matrix for the methyl parathion, ( 20 ), pesticide. [ 49 ] Thioaniline-functionalized Au NPs were electropolymerized in the presence of ( 20 ) on a high surface area carbon nanotube-functionalized glassy carbon electrode modifi ed with Au NP deposits ( Figure 9 A). Extraction of the imprinting substrate generated the imprinted matrix that enabled the voltammetric detection of ( 20 ) through the reduction of the nitro functionalities associated with the analyte (Figure 9 B).…”