Stabilization of O/W Emulsion by Shirasu Porous Glass Membrane Emulsification Method

Abstract

As a first step in an investigation into the application of Shirasu Porous Glass (SPG) membrane emulsification method, a new emulsification technique has been developed at the Miyazaki Prefectural Industrial Research Institute. In the production of cosmetic products, we studied the influence of surfactants, etc., on the emulsification process. SPG is a porous glass with a uniform pore size, and a monodispersed O/W emulsion was obtained with the application of oil under pressure. The particle size of the grains of the emulsion increased to three times as large as the pore size of SPG.
Furthermore, with SPG membrane emulsification method, good emulsification is possible with only an extremely small amount of surfactant, and we confirmed that emulsification could be done with excellent stability and with absolutely no unification over a period of time.
Compared with emulsion made by normal homogenizer, small angle X-ray diffraction measurements and the like suggested that the surfactants were orientated more uniformly on the interface of oil and water.