| A major objective of the present work is to develop the emamectin benzoate (EB) delivery formulation, using microcystis (MC) as carrier and carbopol resin as matrix. The chemical composition and morphologies of MC were investigated. Furthermore, the kinetics studies on MC adsorption to EB and the formulation release were carried out. MC with an average particle size of 3.5 m exists many micropores and abundant functional groups on its surface which presented the considerable binding ability with the maximum sorption capacities of EB on MC 70.78 mg/g , and 1.1×109 EB molecules per capsule in ethanol/water (1:1, ) at 30°C. The cumulative release quantities of granules without coating film agent are 52.9% and 65.3% during 24 h and 72 h respectively. Comparing with technical material, the burst release of EB was obviously suppressed due to the interaction of MC and EB. MC has affect of resistance against UV on EB first time by experiment of UV-contrast, and the recovery of EB is 61.0% by adding MC ,that is higher than EB only. The mobility of EB in sandy loam was carried out, and then high encapsulation efficiency was obtained, being nearly 100%. To Spodoptera exigua and Plutella xylostella, the controlled release of EB formulations all have very good insecticidal effects of sustained-release.These results suggest that the MC may have potential for EB controlled release formulation. |
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