Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
Food Chem. 2023 Mar 15;404(Pt B):134708. doi: 10.1016/j.foodchem.2022.134708. Epub 2022 Oct 21.
Metribuzin (MTZ) is an important herbicide widely used in fields and represents a big threat to the environment and health. Herein, an electrochemical sensor was designed for its detection in commercial product (Egyscor® 70%), spiked tomatoes and potatoes samples with recovery values ranging from 97.12 to 103.41%. Bulk-polymerized MTZ molecularly imprinted polymer (MIP) was developed, using itaconic acid (functional monomer), ethylene glycol dimethacrylate (cross-linker) at an optimum molar ratio 1:5:30, respectively. Differential pulse voltammetry was used to examine the optimization variables of the MIP based sensor such as the variation of (template: monomer: cross-linker) ratio, accumulation time, multi walled carbon nanotubes amount, pH and scan rate, while cyclic voltammetry and electrochemical impedance spectroscopy were used to characterize the sensor. The sensor showed selective adsorption ability and a good linearity over the concentration range of 0.2 ng/mL to 21.429 µg/mL, with LOD and LOQ of 0.1 pg/mL and 0.3 pg/mL, respectively.
二甲戊灵（MTZ）是一种广泛应用于农田的重要除草剂，对环境和健康构成了巨大威胁。在此，设计了一种电化学传感器用于检测商业产品（Egyscor® 70%）、添加到番茄和土豆样品中的二甲戊灵，回收率在 97.12%至 103.41%之间。采用衣康酸（功能单体）、乙二醇二甲基丙烯酸酯（交联剂），以摩尔比 1:5:30 制备了 bulk-polymerized MTZ 分子印迹聚合物（MIP）。差分脉冲伏安法用于研究基于 MIP 的传感器的优化变量，如模板：单体：交联剂比例、积累时间、多壁碳纳米管用量、pH 值和扫描速率的变化，同时循环伏安法和电化学阻抗谱用于表征传感器。该传感器显示出选择性吸附能力和在 0.2ng/mL 至 21.429µg/mL 的浓度范围内具有良好的线性关系，检出限和定量限分别为 0.1pg/mL 和 0.3pg/mL。
