Molecularly Imprinted Polymer-Based Non-Enzymatic Electrochemical Receptor for Detection of Organophosphate Pesticide: Monocrotophos
摘要
Monocrotophos is an organophosphate pesticide widely used to control various pests on numerous crops, including bollworms, mites, black aphids, etc. However, excessive application of this pesticide poses significant risks to the environment and human health, which highlights the need for early detection to remediate its harmful effects. In the present study, a non-enzymatic molecularly imprinted polymer (MIP) electrochemical receptor based on molecular interaction within the polymer matrix has been developed onto the surface of a screen-printed carbon electrode (SPCE) which consists of polyvinyl alcohol (PVA) as the polymer, glutaraldehyde as cross-linker, citric acid as catalyst and Monocrotophos as template molecule for detecting the monocrotophos pesticide at trace levels using cyclic voltammetry. To improve the electrical conductivity receptor Fe3O4 particles were also incorporated. The modified electrode surface was characterized using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), confirming the desired molecules’ attachment. The sensor shows a sensitivity of 45.82 µA(mg L⁻¹)⁻¹cm⁻² with LOD of 0.01ppm. The sensor remains unbothered by other interfering compounds like pesticides of the same class, providing a specific and sensitive method for Monocrotophos detection.
Graphical abstract