The purpose of this study was to prepare a stable oil-in-water emulsion formulation of deltamethrin. Oil-in-water emulsion was prepared by using a two-step procedure. Stability studies were performed at different accelerated conditions (0°C and 54°C) to predict the stability of the formulation. Different parameters, namely, active ingredient content, mean particle size distribution, pH, viscosity, flash point, effect of centrifugation, persistent foaming and emulsion stability were determined during stability studies. The formulation exhibited good stability after preparation at different temperatures. No phase separation was observed during stability testing.
This study was designed to investigate the effect of hydrophilic-lipophilic balance (HLB) values of different surfactant mixtures on the physicochemical properties of emulsifiable concentrate formulations of difenoconazole. Physical tests of emulsion characteristics and storage stability studies were performed for the different samples to predict the stability of these formulations. Different parameters such as active ingredient content, pH, refractive index, surface tension, viscosity, flash point, persistent foam was determined for the prepared samples. The results showed that difenoconazole could be formulated as a stable emulsifiable concentrate by using a mixture of surfactants at HLB values 9.7, 11.9, 12.5 and 13.1. The storage stability test showed that the decomposition rate of the active ingredient content of difenoconazole in different stable formulations was within the acceptable limits of FAO Specifications. The physical and chemical properties of the stable formulations fulfilled the requirements of EC formulation.
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