The development of a model to represent emulsion stability measured by the conductivity technique has been established by Kato et al. (1985). They suggested that the conductivity of the emulsion rapidly decreases with the progress of homogenization because non-conductor oil was mixed into the conducting protein solution. They defined the emulsifying activity (EA) of a protein as the difference between the conductivity of the protein solution prior to the homogenization step of the mixture, and the minimum conductivity achieved during homogenization, as given by Eq. (1). In addition, they related emulsion stability (ES) to the emulsion activity and the initial slope of the conductivity curve just after the homogenization step is completed, as given by Eq. (2).