National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China.
National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China.
J Colloid Interface Sci. 2023 Feb 15;632(Pt A):19-34. doi: 10.1016/j.jcis.2022.11.009. Epub 2022 Nov 14.
The stimuli-responsive pesticide delivery system provides a powerful strategy for enhancing the effective utilization of pesticides and reducing environmental pollution. Here, we prepared a new polydopamine doped dendritic silica (SiO/PDA) nanocarriers for pesticide delivery. The SiO/PDA nanocarriers present uniform spheres with an average diameter of 250 nm and carry center-radial inner pores. After loading dinotefuran (DNF) insecticide, polyethyleneimine (PEI) was used to cap the loaded-pesticide pores. The resulting SiO/PDA@PEI displays high photothermal conversion effect (η = 35.1 %) and pH and near infrared (NIR) light-responsive release behavior. Meanwhile, the SiO/PDA and SiO/PDA@PEI carriers displayed high adhesion and wettability to leaves, and the photostability of DNF encapsulated in SiO/PDA@PEI was improved by nearly 10 times greater than for free DNF. Importantly, the SiO/PDA carriers possessed a benign biocompatibility on Escherichia coli (E. coli), seed and cells. Therefore, this work provides a promising approach to improve the utilization of pesticide.
刺激响应型农药递送系统为提高农药的有效利用率和降低环境污染提供了一种强有力的策略。在这里，我们制备了一种新型的聚多巴胺掺杂树枝状二氧化硅（SiO/PDA）纳米载体用于农药递送。SiO/PDA 纳米载体呈具有平均直径为 250nm 的均匀球体，并带有中心放射状的内孔。负载完敌百虫（DNF）杀虫剂后，使用聚乙烯亚胺（PEI）封闭负载农药的孔。所得的 SiO/PDA@PEI 表现出高的光热转换效率（η=35.1%）和 pH 值及近红外（NIR）光响应释放行为。同时，SiO/PDA 和 SiO/PDA@PEI 载体对叶片具有高的附着力和润湿性，并且封装在 SiO/PDA@PEI 中的 DNF 的光稳定性比游离的 DNF 提高了近 10 倍。重要的是，SiO/PDA 载体对大肠杆菌（E. coli）、种子和细胞具有良好的生物相容性。因此，这项工作为提高农药的利用率提供了一种很有前景的方法。
