Competitive adsorption of α s1-casein and β-casein in oil-in-water emulsions

Abstract

Competitive adsorption of α s1-casein and β-casein at the emulsion droplet surface and the planar oil-water interface has been investigated. Analysis of the aqueous phase after centrifugation of fresh emulsions made with a mixture of α s1-casein + β-casein shows that β-casein predominates at the interface. Exchange experiments indicate that β-casein will rapidly displace α s1-casein from the emulsion droplet surface; ctsl-casein will also displace β-casein, but to a much lesser extent. Surface viscosity measurements at a planar oil-water interface are consistent with the view that the α s1-casein displaced by β-casein is removed from the interfacial region.