Preparation and Characterization of Beta Cypermethrin Nanosuspensions by Diluting O/W Microemulsions

Nanosuspensions of beta cypermethrin with narrow size distribution were prepared from O/W microemulsions. Dynamic light scattering showed that the size of nanoparticles of beta cypermethrin changed little by increasing the volume of diluted water. Transmission electron microscopy confirmed that these nanoparticles have spherical shape. The normal phase high performance liquid chromatography assay showed that the precipitation had no influence on the composition of pesticide. The dissolubility of the pesticide shows that the formulation was approved controlled release.