Learning Objective

• Tests that can be carried out to ensure the stability of an emulsion

The physical stability of emulsions can be tested by performing some simple tests such as the following:

1. Macroscopic examination: The physical stability of an emulsion can be tested by examination of the degree of creaming occurring over a period of time. This is carried out by calculating the volume of the creamed or separated part of the emulsion to the total volume.
2. Globule size analysis: Globule size can be determined by microscopic examination, electronic particle counting devices such as Coulter counter or Laser diffraction.
3. Viscosity changes: The changes in viscosity can be determined using a viscometer.