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Preparation, Characterization, and Bioactivity Evaluation of Lambda-Cyhalothrin Microcapsules for Slow-Controlled

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New polyurea microcapsules offer improved pesticide delivery. These lambda-cyhalothrin-loaded microcapsules provide enhanced efficacy and extended controlled release, reducing environmental impact.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Agricultural Chemistry

Background:

  • Interfacial polymerization enables controlled release microcapsules, enhancing pesticide efficacy and reducing environmental pollution.
  • Polyurea microcapsules are effective for encapsulating active ingredients for slow-release applications.

Purpose of the Study:

  • To prepare and characterize polyurea microcapsules loaded with lambda-cyhalothrin using interfacial polymerization.
  • To investigate the controlled release properties and biological activity of the developed microcapsules.

Main Methods:

  • Interfacial polymerization using modified isocyanate (MDI) and GT-34 initiator.
  • Characterization via optical microscopy, scanning electron microscopy, FTIR, and thermogravimetric analysis.
  • In vitro release studies under varying pH, temperature, and MDI concentrations; biological activity assay on Myzus persicae.

Main Results:

  • Successfully synthesized polyurea microcapsules with an average size of 1.97 μm and 91.48% encapsulation efficiency.
  • Demonstrated sustained release (>7 days) in acetonitrile solution and consistent release profiles under different conditions.
  • Achieved a persistence period of over 21 days against Myzus persicae, outperforming emulsifiable concentrate formulations.

Conclusions:

  • Polyurea microcapsules prepared by interfacial polymerization offer excellent sustained release and enhanced biological efficacy for lambda-cyhalothrin.
  • The controlled release mechanism follows a first-order kinetic model, primarily driven by Fickian diffusion.
  • These microcapsules represent a promising formulation for improving pesticide performance and environmental safety.