Xu Wanzhen, Wang Qingqing, Huang Weihong, Yang Wenming
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China.
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China.
J Sep Sci. 2017 Dec;40(24):4839-4846. doi: 10.1002/jssc.201701004.
We present a novel electrochemical sensor based on an electrode modified with molecularly imprinted polymers for the detection of chlorpyrifos. The modified electrode was constructed by the synthesis of molecularly imprinted polymers by a precipitation method then coated on a glassy carbon electrode. The surface morphology of the modified electrode was characterized by using field-emission scanning electron microscopy and transmission electron microscopy. The performance of the imprinted sensor was thoroughly investigated by using cyclic voltammetry and differential pulse voltammetry. The imprinted electrochemical sensor displayed high repeatability, stability, and selectivity towards the template molecules. Under the optimal experimental conditions, the peak current response of the imprinted electrochemical sensor was linearly related to the concentration of chlorpyrifos over the range 1 × 10 -1 × 10 mol/L with a limit of detection of 4.08 × 10 mol/L (signal-to-noise ratio = 3). Furthermore, the proposed molecularly imprinted electrochemical sensor was applied to the determination of chlorpyrifos in the complicated matrixes of real samples with satisfactory results. Therefore, the molecularly imprinted polymers based electrochemical sensor might provide a highly selective, rapid, and cost-effective method for chlorpyrifos determination and related analysis.
我们展示了一种基于分子印迹聚合物修饰电极的新型电化学传感器，用于检测毒死蜱。通过沉淀法合成分子印迹聚合物，然后将其涂覆在玻碳电极上，构建修饰电极。利用场发射扫描电子显微镜和透射电子显微镜对修饰电极的表面形态进行表征。通过循环伏安法和差分脉冲伏安法对印迹传感器的性能进行了深入研究。该印迹电化学传感器对模板分子表现出高重复性、稳定性和选择性。在最佳实验条件下，印迹电化学传感器的峰电流响应与毒死蜱浓度在1×10⁻¹×10⁻⁶mol/L范围内呈线性关系，检测限为4.08×10⁻⁸mol/L（信噪比=3）。此外，所提出的分子印迹电化学传感器应用于实际样品复杂基质中毒死蜱的测定，结果令人满意。因此，基于分子印迹聚合物的电化学传感器可能为毒死蜱的测定及相关分析提供一种高选择性、快速且经济高效的方法。
