Cen Jun, Li Linhuai, Huang Lingling, Jiang Guangqi
College of Chemistry and Chemical Engineering, Guizhou University Guiyang China
State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University Guiyang China.
RSC Adv. 2022 Aug 17;12(36):23387-23395. doi: 10.1039/d2ra04672e. eCollection 2022 Aug 16.
This study aimed to achieve the controlled-release of bioactive ingredients in microcapsule pesticide delivery systems. A photothermal controlled-release microcapsule pesticide delivery system was constructed using chitosan and polydopamine (PDA) as the wall materials to encapsulate avermectin. All the prepared microcapsules were characterized by the methods of optical microscopy, scanning electron microscopy, transmission electron microscopy, and Fourier-transform infrared spectroscopy. The slow-release, UV-shielding, photothermal performance, and the nematicidal activity of the prepared microcapsules were also systematically investigated. The results indicated that the prepared microcapsules had excellent slow-release and UV-shielding performance when further encapsulated with the PDA layer relative to those of the non-PDA-encapsulated products. The photothermal sensitivity of the AVM@CS/CMA/PDA composite microcapsule under the irradiation of near-infrared light (NIR) was dramatically enhanced with the photothermal conversion efficiency () of 14.93%. Furthermore, the nematicidal activity of the AVM@CS/CMA/PDA composite microcapsule system was effectively improved on exposure to the irradiation of a light-emitting diode (LED) full-spectrum light. The strategies used in this study for developing the photothermal controlled-release pesticide delivery system might play an important role on improving utilization of pesticides.
本研究旨在实现微胶囊农药递送系统中生物活性成分的控释。以壳聚糖和聚多巴胺（PDA）为壁材构建了一种光热控释微胶囊农药递送系统，用于包封阿维菌素。采用光学显微镜、扫描电子显微镜、透射电子显微镜和傅里叶变换红外光谱等方法对所制备的微胶囊进行了表征。还系统研究了所制备微胶囊的缓释性能、紫外线屏蔽性能、光热性能和杀线虫活性。结果表明，相对于未包封PDA的产品，进一步用PDA层包封后的微胶囊具有优异的缓释性能和紫外线屏蔽性能。AVM@CS/CMA/PDA复合微胶囊在近红外光（NIR）照射下的光热敏感性显著增强，光热转换效率为14.93%。此外，在发光二极管（LED）全光谱光照射下，AVM@CS/CMA/PDA复合微胶囊系统的杀线虫活性得到有效提高。本研究中用于开发光热控释农药递送系统的策略可能对提高农药利用率起到重要作用。
