Effect of acidification and heating on the rheological properties of oil-water interfaces with adsorbed milk proteins

Journal of Dairy Science
M Mellema, J G Isenbart

Abstract

The behavior of casein and whey proteins at the oil-water interface was studied using a dynamic drop tensiometer (DDT). The dilational modulus of the interface was measured for aqueous solutions of skim milk powder (SMP) and whey protein concentrate (WPC) with various additions (salt, calcium, lactose) and (order of) various processing steps. Acidification or heating was performed before or after creation of the interface. The elastic properties of oil-water interfaces with adsorbed milk proteins could partly determine the rate of partial coalescence and resulting product instability. For WPC, preacidification slows down the adsorption, but the modulus is not affected. This is probably because, although the whey proteins change conformation more slowly at the interface, still a homogeneous film is formed. If postacidification is applied, coarsening of the protein film leads to loss of interfacial rigidity. Preheating of the aqueous phase with WPC leads to denaturation and aggregation, but the aggregates formed are still surface active and give high moduli. If preheating of a WPC solution is followed by postacidification, the resulting modulus is high (approximately 60 mN/m). The oil-water interfacial properties of SMP are only ...Continue Reading

References

Jan 1, 1997·Journal of Colloid and Interface Science· de Kruif CG
May 23, 2000·Journal of Agricultural and Food Chemistry·A KulmyrzaevD J McClements
Feb 15, 2001·Colloids and Surfaces. B, Biointerfaces·E Dickinson
May 30, 2001·Colloids and Surfaces. B, Biointerfaces·A J. VasbinderK G. de Kruif
Jun 14, 2002·Advances in Colloid and Interface Science·M MellemaT van Vliet
Jun 10, 2004·Journal of Agricultural and Food Chemistry·Sotirios KiokiasArjen Bot

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Citations

Dec 31, 2016·Colloids and Surfaces. B, Biointerfaces·Roua LajnafM A Ayadi
Mar 10, 2009·The European Physical Journal. E, Soft Matter·J Maldonado-ValderramaV J Morris
Feb 6, 2021·Advances in Colloid and Interface Science·Beibei ZhouSean A Hogan
Sep 23, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Julia Maldonado-ValderramaVictor J Morris

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