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Montmorillonite/polyaniline/polyamide nanocomposite as a novel stir bar coating for sorptive extraction of organophosphorous pesticides in fruit juices and vegetables applying response surface methodology

Abstract

In this research a novel nanocomposite based on incorporation of montmorillonite (MMT) into polyaniline-polyamide (PANI-PA) hybrid was prepared by in situ oxidative polymerization of polyaniline in the MMT-PA mixture and subsequently solvent exchange method to obtain a thin layer onto stir bar substrate. The prepared nanocomposites were characterized using Fourier transform infrared sepectroscopy (FTIR), energy dispersive X-ray spectroscomy (EDX), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The prepared MMT/PANI/PA nanocomposite-based stir bar was applied as an extraction device for stir bar sorptive extraction (SBSE) of organophosphorous pesticides (OPPs) in some fruit juices and vegetables in combination with gas chromatography-flame ionization detector (GC-FID) detection. The effect of MMT amount in the nanocomposite and also the effect of PANI hybridation on the extraction capability of the coating was investigated. Important factors influencing the extraction and desorption processes including extraction time, salt content, pH, desorption solvent, its volume and desorption time were studied and optimized using response surface methodology (RSM) applying central composite design (CCD). Limit of detection (LOD) and linear dynamic range (LDR) of the method were in the range of 0.2 to 1 ng mL−1 and 0.6-1000 and 3-1000 ng mL-1, respectively. The method precision (RSD %) with four replicates determinations was in the range of 2.5 to 4.4 % for distilled water at the concentration level of 100 ng mL−1. The developed method was successfully applied to the various fruit juices and vegetable samples, while the relative recoveries (RR%) were obtained to be in the range of 80.0 to 99.7%.

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Publication details

The article was received on 03 Mar 2017, accepted on 26 Jun 2017 and first published on 27 Jun 2017


Article type: Paper
DOI: 10.1039/C7AY00579B
Citation: Anal. Methods, 2017, Accepted Manuscript
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    Montmorillonite/polyaniline/polyamide nanocomposite as a novel stir bar coating for sorptive extraction of organophosphorous pesticides in fruit juices and vegetables applying response surface methodology

    Z. ayazi, R. Jafarzadeh and A. A. Matin, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY00579B

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