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Development of an imprinted electrochemical sensor and its application for sensitive detection of malathion in olive fruits and oils
Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco. (Faculty of sciences, Department of Biology)
Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco. (Faculty of Sciences, Department of Physics, Department of Biology)
Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco. (Faculty of Sciences, Department of Physics, Department of Biology)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-0296-5247
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(English)In: Bioelectrochemistry, ISSN 1567-5394, E-ISSN 1878-562XArticle in journal (Refereed) In press
Abstract [en]

Malathion (MAL) is an organophosphorus (OP) insecticide. It is a cholinesterase inhibitor, 15 which can pose serious health and environmental problems. In this study, a sensitive and 16 selective molecular imprinted polymer (MIP) based on screen-printed gold electrodes (Au-17 SPE) for MAL detection in olive oils and fruits, was devised. The MIP sensor was prepared 18 using acrylamide as the functional monomer and MAL as the template. Subsequently, the 19 morphology of the electrode surface was studied by scanning electron microscopy (SEM) and 20 atomic force microscopy (AFM). The electrochemical characterization of the developed MIP 21 sensor was performed by cyclic voltammetry (CV), differential pulse voltammetry (DPV), 22 and electrochemical impedance spectroscopy (EIS) techniques. The operational repeatability 23 and stability of the sensor were studied. It was found to have a dynamic concentration range 24 of (0.1 pg mL-1-1000 pg mL-1) and a low limit of detection (LOD) of 0.06 pg mL-1. 25 Furthermore, the sensor was employed to determine MAL content in olive oil with a recovery 26 rate of 87.9% and a relative standard deviation of 8%. It was successfully applied for MAL 27 determination in real samples and promise to open new opportunities for the detection of OP 28 pesticides residues in various food products, as well as in environmental applications.

Place, publisher, year, edition, pages
Elsevier.
Keywords [en]
Molecularly imprinted polymer; Screen printed gold electrode; Electrochemical 30 sensor; Malathion; Olive oils; olive fruits
National Category
Chemical Engineering Analytical Chemistry Materials Engineering
Research subject
Chemistry with specialization in Analytical Chemistry; Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-396759OAI: oai:DiVA.org:uu-396759DiVA, id: diva2:1368876
Funder
EU, Horizon 2020, 645758Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-08Bibliographically approved

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