Development and Stability Evaluation of an Environmentally Friendly Aqueous Suspoemulsion of Emamectin Benzoate

In this study, an aqueous suspoemulsion (SE) of emamectin benzoate, an effective insecticide, was developed using a mixture of non-ionic and anionic surfactants and soy lecithin as an emulsifying and stabilising agent of natural origin, avoiding the use of toxic organic solvents. The stability of this formulation was evaluated by CIPAC MT-180 methods, obtaining values of 0.03 mL cream, 0.01 mL free oil and no observable sediment at 0.5 h after dispersion. At 24.5 h after dispersion, values of 0.04 mL cream, 0.01 mL free oil and no observable sediment were obtained, ensuring the stability of the dispersion of SE in water. The concentrated SE had a density of 0.95 g/mL at 25 °C, pH = 7.29 at 25 °C, and a dynamic viscosity of 170 cP at 25 °C. The results obtained offer new opportunities for the design of plant protection products with lower environmental impact by incorporating biodegradable additives, favouring the development of a more responsible and efficient agriculture, in line with the principles of sustainability.