According to Smith and Culbertson (2000), an emulsion is defined as “mixtures of at least
two immiscible liquids, one of which is dispersed in the other in the form of fine droplets.”
To stabilize an emulsion, it is often beneficial to add an amphiphilic surfactant such as
protein. Proteins contain both hydrophobic and hydrophilic components owing to their amino
acids; therefore, when added to the emulsion they will orient themselves at the interface of
the appropriate molecule based on polarity. This orientation at the interface will help stabilize
the emulsion by decreasing the interfacial tension between the two immiscible liquids