Double emulsions are colloidal systems of great interest for
the cosmetics industry as they enable to encapsulate both
hydrophilic and lipophilic molecules. However, their
formulation is very delicate and requires an important knowhow. Their characterization is also quite limited with classical
techniques that, for most of them require dilution (particle
size), or are not quantitative (microscopy).
In this application note, the release of an encapsulated active
in the internal emulsion is studied using the Turbiscan
technology. To release the active, the double emulsion has to
be destabilized into a simple emulsion were the active will
results in the external phase. This principle is usually used for
topical emulsions were some constituents on the surface of
the skin will trigger the destabilization of the double
emulsions and so activate the release of the active. By
measuring the emulsion breakdown of the formulation using
the Turbiscan™, the release of the active is evaluated
