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Non-Enzymatic Electrochemical Sensing of Malathion Pesticide in Tomato and Apple Samples Based on Gold Nanoparticles-Chitosan-Ionic Liquid Hybrid Nanocomposite

Department of Chemistry, Faculty of Science, Hacettepe University, 06800 Beytepe-Ankara, Turkey
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Author to whom correspondence should be addressed.
Sensors 2018, 18(3), 773; https://doi.org/10.3390/s18030773
Received: 21 December 2017 / Revised: 20 February 2018 / Accepted: 24 February 2018 / Published: 4 March 2018
(This article belongs to the Special Issue Novel Approaches to Biosensing with Nanoparticles)
Malathion (MLT) is an organophosphorous type pesticide and having seriously high toxicity and electrochemical platforms for rapid, simple, inexpensive and sensitive determination of pesticides is still a special concern. This paper describes a simple preparation of a composite film consisting of ionic liquid (IL), chitosan (CS) and electrochemically synthesized gold nanoparticles (AuNPs) on single use pencil graphite electrodes (PGEs). The microscopic and electrochemical characterization of AuNP-CS-IL/PGE was studied using scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. This fabricated surface was then explored for the first time as a sensing matrix for the non-enzymatic electrochemical sensing of malathion by cyclic voltammetry and square wave voltammetry measurements. The proposed AuNP-CS-IL/PGE showed excellent characteristics and possessed remarkable affinity for malathion. The voltammetric current response exhibited two linear dynamic ranges, 0.89–5.94 nM and 5.94–44.6 nM reflecting two binding sites, with a detection limit of 0.68 nM. The method was applied in real sample analysis of apple and tomato. The results demonstrate the feasibility of AuNP-CS-IL-modified electrodes for simple, fast, ultrasensitive and inexpensive detection of MLT. View Full-Text
Keywords: malathion; gold nanoparticles; ionic liquids; organophosphorus (OP) pesticides; food safety; electrochemical sensor; direct electrochemical detection malathion; gold nanoparticles; ionic liquids; organophosphorus (OP) pesticides; food safety; electrochemical sensor; direct electrochemical detection
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MDPI and ACS Style

Bolat, G.; Abaci, S. Non-Enzymatic Electrochemical Sensing of Malathion Pesticide in Tomato and Apple Samples Based on Gold Nanoparticles-Chitosan-Ionic Liquid Hybrid Nanocomposite. Sensors 2018, 18, 773.

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