Gurusamy Lakshmanan, Cheng Ru-Wen, Anandan Sambandam, Liu Cheng-Hua, Wu Jerry J
Department of Environmental Engineering and Science, Feng Chia University, Taichung 407, Taiwan.
Department of Chemistry, National Institute of Technology, Trichy 620015, India.
Materials (Basel). 2023 Nov 7;16(22):7065. doi: 10.3390/ma16227065.
Super-sensitive malathion detection was achieved using a nonenzymatic electrochemical sensor based on a CuO/ZnO-modified glassy carbon electrode (GCE). Due to the high affinity between the Cu element and the sulfur groups in malathion, the developed CuO-ZnO/GCE sensor may bond malathion with ease, inhibiting the redox signal of the Cu element when malathion is present. In addition to significantly increasing the ability of electron transfer, the addition of 3D-flower-like ZnO enhances active sites of the sensor interface for the high affinity of malathion, giving the CuO-ZnO/GCE composite an exceptional level of sensitivity and selectivity. This enzyme-free CuO-ZnO/GCE malathion sensor demonstrates outstanding stability and excellent detection performance under optimal operating conditions with a wide linear range of malathion from 0 to 200 nM and a low detection limit of 1.367 nM. A promising alternative technique for organophosphorus pesticide (OP) determination is offered by the analytical performance of the proposed sensor, and this method can be quickly and sensitively applied to samples that have been contaminated with these pesticides.
基于氧化铜/氧化锌修饰玻碳电极（GCE）的非酶电化学传感器实现了对马拉硫磷的超灵敏检测。由于铜元素与马拉硫磷中的硫基团具有高亲和力，所开发的氧化铜-氧化锌/GCE传感器能够轻松结合马拉硫磷，当存在马拉硫磷时会抑制铜元素的氧化还原信号。除了显著提高电子转移能力外，添加三维花状氧化锌增强了传感器界面与马拉硫磷高亲和力的活性位点，赋予氧化铜-氧化锌/GCE复合材料卓越的灵敏度和选择性。这种无酶的氧化铜-氧化锌/GCE马拉硫磷传感器在最佳操作条件下表现出出色的稳定性和优异的检测性能，马拉硫磷的线性范围宽，为0至200 nM，检测限低至1.367 nM。所提出传感器的分析性能为有机磷农药（OP）的测定提供了一种有前景的替代技术，该方法可快速、灵敏地应用于被这些农药污染的样品。
