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Labrafil M2125-CS is a non-ionic surfactant component widely used for improving the solubilization of poor water-soluble drugs and as component of lipid-based nanosystem formulation. The aim of this research work was to evaluate in depth the stability of lipid-based nanosystems when exposed at several experimental conditions, such as temperature- and pH-variations, and during a specific storage process—lyophilization. Dynamic light scattering was the main analysis carried out during this research work for investigating eventual physico-chemical variations of nanosystem properties after different storage phases. We demonstrated that many of prepared formulations were able to maintain almost unchanged mean size and polydispersity index values, resisting acid and basic pH or high and low temperature, as well as the freeze-drying process. Finally, the results showed that there are no univocal experimental conditions suitable for the storage of all formulation types, but each sample requires customized conditions.

Lipid-Based Formulations Containing Labrafil M2125-CS: A Deep Investigation on Nanosystem Stability