In contrast, in the case of b-casein interfaces, introduction of BSA led to an increase of the interfacial shear modulus from 0.18 to 2.8 mN/m, although at a much slower rate compared to the exchange observed with b-casein. Ultimately, after 1 h of exchange, the two resulting reconditioned protein interfaces displayed very comparable interfacial shear storage moduli, with frequency dependency profiles almost overlapping (Figures and).