Preparation of chitosan nanoparticles loaded with lambda-cyhalothrin by metal ion coordination assembly and their bioactivity against Acyrthosiphon pisum(Harris)
[Aims]Currently,the complex preparation process of nano-pesticides hinders their promotion.There is an urgent need for a simple method with low-energy consumption and lowcost to obtain pesticide-loaded nanoparticles in order to improve pesticide utilization.[Methods]Lambda-cyhalothrin 2.5％nanoparticles were prepared using natural biodegradable,safe and environmentally friendly chitosan material by metal ion coordination assembly method.The bioactivity was evaluated by measuring its release performance and bioactivity against Acyrthosiphon pisum in laboratory.[Results]The results showed that the nanoparticles loaded with lambda-cyhalothrin were spherical,the encapsulation rate was 92.06％,and the average particle size(D50)was 202.83 nm.The thermal stability of lambda-cyhalothrin was improved after it was loaded by nanoparticles.The cumulative release rate of nanoparticles was 59.25％at 2 h in the release solution.The LC50 values at 48 h of lambda-cyhalothrin-loaded nanoparticles to A.pisum was 0.004 mg/L,which was higher than that of emulsion(0.006 mg/L)and loaded by micron-particles(0.01 mg/L),respectively.[Conclusions]The results of this study could provide a basis for the development of nano-formulations with excellent control effect on leaf pests.
nano-pesticideutilization rate of pesticidenano-suspension concentrate
万方数据
维普
