Abstract
Imidacloprid is a neonicotinoid insecticide widely used in the production and cultivation of crops. In recent years, the extensive use of imidacloprid in agricultural production has resulted in large amounts of pesticide residues in agricultural products and the environment. Therefore, it is necessary to establish a rapid, accurate, sensitive and convenient method for detecting imidacloprid pesticide residues to ensure the safety of agricultural products and the environment. To clarify how to use the molecular imprinting method for the electrochemical rapid residue detection of imidacloprid. This paper selected reduced graphene oxide and gold nanoparticles as modifiers modified on screen-printed carbon electrodes (SPCE) chitosan as a functional monomer, and imidacloprid as template molecule to prepare molecularly imprinted polymer, and applied this sensor to the residue detection of imidacloprid. The results showed that the concentration of imidacloprid showed a good linear relationship with the peak response current, and the detection limit of imidacloprid was 0.5 μM, while the sensor had good repeatability and interference resistance. The recoveries of imidacloprid spiked on three samples, mango, cowpea and water, were in the range of 90–110% (relative standard deviation, RSD<5%), which proved the practicality and feasibility of the assay established in this paper. The results of this paper can be used as a basis for the research on the detection of imidacloprid pesticide residues in food or environment.
Highlights
Imidacloprid is a largely commercialized first generation neonicotinoid insecticide Imidacloprid [1], which has gastric, thixotropic, and systemic activities, as well as high efficiency, low toxicity, and broad-spectrum characteristics [2]
More and more immunoassays have been used for the rapid detection of imidacloprid in the last two decades, such as enzyme-linked immunosorbent assay (ELISA) [48], chemiluminescent enzyme-linked immunosorbent assay (CL-ELISA) [49], and time-resolved fluorescence immunoassay (TRFIA) [50], as well as novel methods such as UCNPs immunoassay methods[51]
Ghodsi et al [52] developed an electrochemical sensor for imidacloprid based on electrodeposited TiO2 nanoparticles (TiO2 NPs) modified glassy carbon electrode (GCE) with a detection limit of 0.3 μM
Summary
Imidacloprid is a largely commercialized first generation neonicotinoid insecticide Imidacloprid [1], which has gastric, thixotropic, and systemic activities, as well as high efficiency, low toxicity, and broad-spectrum characteristics [2]. It is widely used to control thrips and mealybugs during mango and cowpea cultivation [3,4]. Relevant studies have shown that the use of pesticides will affect non-target organisms such as Trichogramma, Harmonia. Analysis of imidacloprid residues based on portable molecular imprinting sensors. Foundation of China (31760518), The Open Project of Key Laboratory of Tropical Fruit Tree Biology of Hainan Province (KFZX2020001), College Students’ innovation and Entrepreneurship Project
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