School of Resources and Environment, University of Electronic Science and Technology of China, P.O. Box 611731, Xiyuan Ave, Chengdu, PR China; Department of Chemical Engineering and Energy, Quchan University of Technology, Quchan 9477177870, Iran.
Department of Chemical Engineering and Energy, Quchan University of Technology, Quchan 9477177870, Iran.
J Hazard Mater. 2022 Feb 5;423(Pt A):127058. doi: 10.1016/j.jhazmat.2021.127058. Epub 2021 Aug 28.
Cyanazine is a beneficial herbicide in the triazines group that inhibits photosynthesis in plants and monitoring of this herbicide is so important for study agriculture products. The present researches have been focused on monitoring of cyanazine by a straightforward and fast electrochemical strategy. Herein, to monitor the cyanazine level, Pt and Pd doped CdO nanoparticle decorated SWCNTs composite (Pt-Pd-CdO/SWCNTs) has been synthesized as a conductive mediator and characterized by EDS, SEM and TEM techniques. The Pt-Pd-CdO/SWCNTs and ds-DNA have been used for modification of the gold electrode (GE). Moreover, the oxidation signal of guanine relative to ds-DNA at the surface of Pt-Pd-CdO/SWCNTs/ds-DNA/GE has been considered as an bioelectroanalytical issue to monitoring cyanazine for the first time. Electrochemical impedance spectroscopic (EIS) signals have confirmed that the inclusion of Pt-Pd-CdO/SWCNTs at the surface of the GE has lowered charge-transfer resistance by ca.1.54 times and created a highly conductive state for monitoring of cyanazine in nanomolar concentration. On the other hand, differential pulse voltammograms (DPV) of Pt-Pd-CdO/SWCNTs/ds-DNA/GE have indicated a linear dynamic range of 4.0 nM-70 µM with a detection limit of 0.8 nM to the monitoring of cyanazine. In addition, the molecular docking study has emphasized that cyanazine herbicide is capable of binding to ds-DNA preferably at the guanine-cytosine rich sequences, and confirmed experimental results. In the final step, Pt-Pd-CdO/SWCNTs/ds-DNA/GE has been successfully utilized for the monitoring of cyanazine herbicide in food and water samples.
三聚氰胺类除草剂草净津通过抑制植物光合作用来发挥除草作用，对其进行监测对农产品研究十分重要。目前，已有许多研究聚焦于开发简单、快速的电化学策略来监测草净津。在此，我们合成了一种由 Pt 和 Pd 掺杂的 CdO 纳米粒子修饰的单壁碳纳米管复合材料（Pt-Pd-CdO/SWCNTs）作为导电介体，并通过 EDS、SEM 和 TEM 技术对其进行了表征。Pt-Pd-CdO/SWCNTs 和 ds-DNA 被用于修饰金电极（GE）。此外，我们首次考虑将相对于 ds-DNA 在 Pt-Pd-CdO/SWCNTs/ds-DNA/GE 表面的鸟嘌呤的氧化信号作为生物电化学问题来监测草净津。电化学阻抗谱（EIS）信号证实，Pt-Pd-CdO/SWCNTs 包含在 GE 表面降低了约 1.54 倍的电荷转移电阻，并为监测纳摩尔浓度的草净津创造了一个高导电性状态。另一方面，Pt-Pd-CdO/SWCNTs/ds-DNA/GE 的差分脉冲伏安法（DPV）表明，草净津的线性动态范围为 4.0 nM-70 µM，检测限为 0.8 nM。此外，分子对接研究强调了草净津除草剂能够优先与富含鸟嘌呤-胞嘧啶的 ds-DNA 结合，实验结果也证实了这一点。最后，Pt-Pd-CdO/SWCNTs/ds-DNA/GE 已成功用于食品和水样中草净津除草剂的监测。
