Nano‐EMB‐SP improves the solubility, foliar affinity, photostability and bioactivity of emamectin benzoate

溶解度 纳米- 溶剂 水溶液 化学 核化学 延伸率 扫描电子显微镜 分散性 生物测定 色谱法 材料科学 有机化学 生物 遗传学 极限抗拉强度 复合材料 冶金
作者
Fei Gao,Bo Cui,Chong Wang,Xingye Li,Bohao Li,Shenshan Zhan,Yue Shen,Xiang Zhao,Changjiao Sun,Chunxin Wang,Yan Wang,Zhanghua Zeng,Haixin Cui
出处
期刊:Pest Management Science [Wiley]
卷期号:78 (8): 3717-3724 被引量:11
标识
DOI:10.1002/ps.7015
摘要

Abstract BACKGROUND Emamectin benzoate (EMB), a frequently used biopesticide, is poorly soluble in water, making it difficult to wet the leaf surface, is prone to degrade in sunlight and readily loses its bioactivity. Traditional methods such as organic solvent application, pH adjustment and addition of photoprotectants either increase the economic and environmental costs or barely achieve the desired goal. We hypothesized that nanotechnology could improve the solubility, foliar affinity, photostability and bioactivity of EMB. This research set out to prepare a nano‐EMB solid powder (nano‐EMB‐SP) and test this hypothesis. RESULTS Nano‐EMB‐SP was prepared using a self‐emulsifying method combined with carrier solidification. The mean particle size and Polydispersity index (PDI) of nano‐EMB‐SP were 14.64 nm and 0.24, respectively. A scanning electron microscopy image showed that EMB nanoparticles were mainly spherical or ellipsoidal in shape. Without organic solvent, the aqueous solubility of EMB in nano‐EMB‐SP was 4500 mg L −1 , at least 14‐fold that of the EMB soluble granule (EMB‐SG), which is solubilized by pH adjustment. Excellent foliar affinity of EMB was achieved by nano‐EMB‐SP, which completely wet and penetrated the superhydrophobic surface of cabbage ( Brassica oleracea L.) leaf. Without photoprotectants, up to 82% of EMB content can be protected from ultraviolet (UV) damage in nano‐EMB‐SP. The combined effects of excellent photostability and foliar affinity of nano‐EMB‐SP led to the bioactivity of EMB being almost unchanged before and after UV radiation. CONCLUSION Nano‐EMB‐SP is an eco‐friendly and efficient way to improve the solubility, foliar affinity, photostability and bioactivity of EMB. This research provides a good approach to improving the efficacy of poorly soluble and UV‐sensitive pesticides. © 2022 Society of Chemical Industry.
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