Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China.
J Mater Chem B. 2021 Jan 28;9(3):783-792. doi: 10.1039/d0tb02430a.
Pesticides play a very important role in pest control and plant protection. However, they can be limited by a tendency to cause ecological system damage due to significant losses into the environment. To increase pesticide utilization efficiency, we developed highly leaf-adhesive avermectin nanocapsules (Av-pH-cat@CS) with pH-responsive controlled release properties. The Av-pH-cat@CS nanocapsules displayed good thermal stability and photostability in response to UV light irradiation. The Av-pH-cat@CS nanocapsules could be disrupted at low pH and they exhibited excellent controlled release in response to pH, which improved the release of avermectins. In addition, the Av-pH-cat@CS nanocapsules were highly adhesive to crop leaves as a result of strong hydrogen bonding, which prolonged the retention time on crop leaves. The Av-pH-cat@CS nanocapsules with pH-responsive release and strong leaf adhesion improved the control efficacy and enhanced the utilization efficiency. Our findings offer a promising approach to prolonging pesticide duration on crop leaves and improving the utilization efficiency.
农药在病虫害防治和植物保护中起着非常重要的作用。然而，由于大量损失到环境中，它们可能会受到生态系统破坏的限制。为了提高农药的利用效率，我们开发了具有 pH 响应控制释放特性的高叶附性阿维菌素纳米胶囊（Av-pH-cat@CS）。Av-pH-cat@CS 纳米胶囊在应对紫外光照射时表现出良好的热稳定性和光稳定性。Av-pH-cat@CS 纳米胶囊在低 pH 下会被破坏，并表现出优异的 pH 响应控制释放性能，从而提高了阿维菌素的释放。此外，由于强烈的氢键作用，Av-pH-cat@CS 纳米胶囊对作物叶片具有很强的附着力，从而延长了在作物叶片上的滞留时间。具有 pH 响应释放和强叶附性的 Av-pH-cat@CS 纳米胶囊提高了防治效果，增强了利用效率。我们的研究结果为延长农药在作物叶片上的持效期和提高农药利用率提供了一种很有前途的方法。
