Interfacial properties, film dynamics and bulk rheology: A multi-scale approach to dairy protein foams.

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ID: 77038
2019
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Abstract
The effective contribution of interfacial properties to the rheology of foams is a source of many open questions. Film dynamics during topological T1 changes in foams, essentially studied for low molecular weight surfactants, and scarcely for proteins, could connect interfacial properties to protein foam rheology.We modified whey protein isolate (WPI), and its purified major protein β-lactoglobulin (β-lg) by powder pre-conditioning and dry-heating in order to obtain a broad variety of interfacial properties. We measured interfacial properties, film relaxation duration after a T1 event and bulk foam rheology.We found that, for β-lg, considered as a model protein, the higher the interfacial elastic modulus, the longer the duration of topological T1 changes and the greater the foam storage and loss moduli and the yield stress. However, in the case of the more complex WPI, these correlations were less clear. We propose that the presence in WPI of other proteins, lactose and minerals modify the impact of pre-conditioning and dry-heating on proteins and thereby, their behaviour at the interface and inside the liquid film.
Reference Key
audebert2019interfacialjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Audebert, Alexia;Saint-Jalmes, Arnaud;Beaufils, Sylvie;Lechevalier, Valérie;Le Floch-Fouéré, Cécile;Cox, Simon;Leconte, Nadine;Pezennec, Stéphane;
Journal Journal of colloid and interface science
Year 2019
DOI
S0021-9797(19)30170-5
URL
Keywords
whey protein disproportionation foam rheology interfacial rheology powder dry-heating topological rearrangement

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