Guangdong Biological Pesticide Engineering Technology Research Center, South China Agricultural University, Guangzhou, China.
College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, China.
Int J Biol Macromol. 2022 Nov 1;220:193-203. doi: 10.1016/j.ijbiomac.2022.08.066. Epub 2022 Aug 16.
Botanical pesticides are biological pesticides that are environment friendly. However, their instability and short persistence limit their application. In this study, pH sensitive chitosan based rotenone (Rot) nanoparticles (CS/CMCS/Rot-NPs) were prepared using chitosan and carboxymethyl chitosan to take advantage of the acidic nature of the red fire ant midgut. Chitosan based nanoparticles showed photoprotective and slow sustained release effects on Rot and significantly increased the insecticidal activity of Rot against red fire ants. The 24-96hLC of CS/CMCS/Rot-NPs against red fire ants was 3.28-6.84 fold that of Rot. The CS/CMCS/Rot-NPs significantly reduced the venom alkaloid content of red fire ants and their living environment and weakened their survival by increasing their survival cost in the ecological environment. Nanotechnology combined with botanical pesticides can be used as a novel, safe, effective, and ecofriendly method to control red fire ants.
植物源农药是环保型生物农药，但它们的不稳定性和短持效性限制了它们的应用。本研究利用红火蚁中肠的酸性环境，制备了 pH 敏感的壳聚糖载鱼藤酮（Rot）纳米粒（CS/CMCS/Rot-NPs）。壳聚糖基纳米粒对 Rot 具有光保护和缓慢持续释放作用，显著提高了 Rot 对红火蚁的杀虫活性。CS/CMCS/Rot-NPs 对红火蚁的 24-96hLC50 是 Rot 的 3.28-6.84 倍。CS/CMCS/Rot-NPs 显著降低了红火蚁及其生存环境中的毒液生物碱含量，通过增加其在生态环境中的生存成本，削弱了其生存能力。纳米技术与植物源农药相结合，可以作为一种新型、安全、有效、环保的方法来控制红火蚁。
