Preparation and properties of rotenone nanoparticle based on mesoporous silica

As carriers of pesticides, nanomaterials can improve the stability of pesticides and regulate the release rate of pesticides, so it is an important means to improve the utilization rate of pesticides. Mesoporous silica nanoparticles (MSNs) are nanomaterials with adjustable particle size and pore size, high specific surface area and good biocompatibility. Rotenone is an excellent biological pesticide, but may easily degrade in the environment and have poor uptake and translocation properties. In this study, an improved soft-template method was used to prepare MSNs that have uniform particle size, and rotenone was loaded into MSNs (Rot@MSNs) by solvent evaporation method. The prepared Rot@MSNs was proved to possess a considerable loading rate of rotenone (31.6%), and the sustained-release time of Rot@MSNs was more than 288 hours. 3 days after the application, rotenone was detected in both the upper and lower leaves of treated tomato leaves. In summary, the MSNs can improve the uptake and translocation properties of rotenone in tomato plants, and this study have great significance for reducing the use of pesticides, mitigating environmental pollution and ensuring food safety.