Self-Assembled Degradable Nanogels Provide Foliar Affinity a
发布日期:2024-06-13 19:42
来源:网络
作者:Feng Liu
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Self-Assembled Degradable Nanogels Provide Foliar Affinity and Pinning for Pesticide Delivery by Flexibility and Adhesiveness Adjustment
ACS Nano 2021, 15, 9
利用柔性纳米材料构建载药纳米凝胶,通过调控纳米载体的粘性和柔性状态,液滴与叶面的亲和性显著提升,在恶劣环境下的施用药效也得到有力保障。该农药负载系统以纳米级乳液作为微型反应器,使用催化剂诱导反应元件在微反应器内自组装形成前段共聚物胶束,在自发吸收反应器中剩余溶剂后形成纳米凝胶,从而与溶剂中的农药成分形成结合状态,一步实现农药的高效装载,并通过调控载体材料的软端结构实现了载药凝胶由球状到饼状的形态控制。将纳米凝胶负载高效氯氟氰菊酯用于叶面喷雾施用防治害虫,相比乳油制剂,纳米凝胶能够在叶面上具有更广的分布范围、更强亲和粘附能力,以及优异的抗光解能力,在模拟强光和强雨条件下依然表现出良好的杀虫效果。在田间实际应用过程中,纳米制剂不仅表现出高效杀虫活性,而且比常规农药制剂具有更强的逆境抵抗能力,有效延长持效期,降低了农药施用频率。同时,载体材料具有一定的降解性,材料本身的二次污染风险大大降低。
Abstract
At present, it is highly important to develop a simple and compatible nano delivery system for pesticides for foliar application, which can improve their insecticidal efficacy and resistance to adverse climates while reducing the environmental risks. Polyethylene glycol and 4,4-methylenediphenyl diisocyanate are used as hydrophilic soft and hydrophobic hard segments, respectively, for polymer self-assembly and polyurethane gelation in a nanoreactor. The nanocarrier synthesis and the pesticide loading are realized by a one-step integration procedure and suited well for hydrophobic active compounds. Modifying the molecular structure of the soft segment can adjust the flexibility of the nanocarriers and result in viscosity and deformation characteristics. After foliar spray application, the foliar flattening state of the nanogels increases the foliar protection area by 2.21 times and improves both pesticide exposure area and target contact efficiency. Concurrently, the flexibility and viscosity of the nanogels increase the washing resistance and the retention rate of the pesticide by approximately 80 times under continuous washing. The encapsulation of the nanogels reduces the foliar ultraviolet (UV) degradation and aquatic pesticide exposure, which increase the security of λ-cyhalothrine by 9.33 times. Moreover, the degradability of nanogels is beneficial for pesticide exposure and reducing pollution. This system has simple preparation, good properties, and environmental friendliness, making the nanocarriers promising for delivering pesticides.
文章链接:
https://pubs.acs.org/doi/10.1021/acsnano.1c04317
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