The charging of particles and subsequent electrostatic separation behaviour is very much composition-dependent, where the presence of a large amount of starch granules can even impair the protein enrichment, as these can obtain similar charges (Pelgrom et al., 2015c;Xing et al., 2020). To overcome this, air classification is used as a first purification step to remove the starch from starch rich legumes, such as yellow pea, prior to electrostatic separation (