To evaluate the foaming properties of a protein, foam stability (FS), foam capacity (FC) and foam expansion (FE) can be measured. FE and FC are measured in volume (%) when whipped, while the volume of the foam over time (normally 0-30 min) gives the protein’s FS (Boye et al., 2010). In a study done by Boye et al. (2010) SPI showed a FE of 41.8% and a FS of 93 %.