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- W2621069132 abstract "Protein hydrolysates are commonly used in high-tolerance or hypoallergenic formulae. The relation between the physicochemical properties of hydrolysed proteins (i.e., size, molecular weight distribution, charge, hydrophobicity), and their emulsifying properties is not fully understood. In this work, the emulsion forming ability (i.e., the equilibrium between droplet formation and coalescence during emulsification), the gravitational stability, the adsorption kinetics and the interfacial dilatational rheology of whey proteins and whey protein hydrolysates were investigated. More extensive hydrolysis resulted in a progressive decrease of the surface hydrophobicity of the emulsifiers (i.e., whey protein or whey protein hydrolysates). Whey protein was able to form smaller emulsion droplets at low concentrations (<1 wt%) compared to whey protein hydrolysates (WPH). When the concentration of WPH was in excess (>2 wt%), similar minimum droplet sizes were obtained due to the adsorption of large peptides. Whey protein-stabilised interfaces showed the lowest interfacial tension and ζ-potential, which both increased with increasing degree of hydrolysis. Whey protein produced stronger oil-water interfacial layers (i.e., high dilatational moduli and non-linear behavior) and had higher protein surface coverage compared to WPH. Small whey protein peptides (<5 kDa) formed a weak oil-water interfacial film, which led to unstable emulsions. In whey protein-stabilised emulsions, β-lactoglobulin showed preferential interfacial adsorption over α-lactalbumin. In emulsions containing WPH, large peptides (>5 kDa) were preferentially adsorbed over small peptides. Emulsion physical stability was strongly influenced by the oil droplet size, and by the formation of an inter-connected viscoelastic film at the oil droplet interface which was observed only for whey protein and peptides with high molecular weight (>5 kDa). These results should be considered when formulating specialized nutrition emulsions." @default.
- W2621069132 created "2017-06-09" @default.
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- W2621069132 date "2017-12-01" @default.
- W2621069132 modified "2023-10-11" @default.
- W2621069132 title "Interfacial properties of whey protein and whey protein hydrolysates and their influence on O/W emulsion stability" @default.
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- W2621069132 doi "https://doi.org/10.1016/j.foodhyd.2017.06.001" @default.
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