College of Science , China Agricultural University , 2 Yuanmingyuan West Road , Beijing 100083 , China.
CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology (NCNST) , 11 Beiyitiao , Zhongguancun, Beijing 100190 , China.
J Agric Food Chem. 2018 Mar 21;66(11):2616-2622. doi: 10.1021/acs.jafc.7b05500. Epub 2018 Mar 2.
Pesticide carrier systems are highly desirable in achieving the effective utilization of pesticides and reduction of their loss. In order to increase utilization and enhance pesticide adhesion to harmful targets, adhesive and stimulus-responsive nanocomposites were prepared using graphene oxide (GO) and polydopamine (PDA). The results demonstrated that graphene oxide with a layer of PDA had a high hymexazol-loading capacity. The release curve of hymexazol from the nanocomposite showed that the release was NIR-laser-dependent and pH-dependent. The adhesion-performance investigation demonstrated that Hy-GO@PDA exhibited greater hymexazol persistence than a hymexazol solution after a simulated-rainwash experiment, and it also left more hymexazol residue than a hymexazol solution with a surfactant under high concentrations. Finally, the bioactivity of the prepared hymexazol-loaded nanocomposite was measured against Fusarium oxysporum f. sp. cucumebrium Owen, and it showed an inhibition activity similar to that of the hymexazol solution. All of these revealed that GO with a PDA layer could serve as pesticide carrier to solve low-utilization and wash-off problems, especially for water-soluble pesticides.
在实现农药的有效利用和减少损失方面，农药载体系统是非常理想的。为了提高利用率并增强农药对有害目标的附着力，使用氧化石墨烯（GO）和聚多巴胺（PDA）制备了具有粘附性和刺激响应性的纳米复合材料。结果表明，具有一层 PDA 的氧化石墨烯具有很高的 hymexazol 负载能力。纳米复合材料中 hymexazol 的释放曲线表明，释放是近红外激光依赖性和 pH 值依赖性的。附着力性能研究表明，Hy-GO@PDA 在模拟雨淋实验后比 hymexazol 溶液具有更高的 hymexazol 持久性，并且在高浓度下比含有表面活性剂的 hymexazol 溶液留下更多的 hymexazol 残留物。最后，对制备的载 hymexazol 纳米复合材料对黄瓜枯萎病菌（Fusarium oxysporum f. sp. cucumebrium Owen）的生物活性进行了测量，其抑制活性与 hymexazol 溶液相似。所有这些都表明，具有 PDA 层的 GO 可以用作农药载体来解决利用率低和冲洗掉的问题，特别是对于水溶性农药。
