The microstructural and rheological properties of Na-caseinate dispersions

Journal of Colloid and Interface Science
Hui Lin Tan, Kathryn M McGrath

Abstract

The self-diffusion coefficients of water and casein aggregates in aqueous Na-caseinate dispersions were measured using a pulsed gradient stimulated echo nuclear magnetic resonance technique (PGSTE-NMR). The results for water self-diffusion are discussed in terms of the cell model. The influence of Na-caseinate concentration on water self-diffusion can be explained by obstruction and tortuosity effects arising due to the presence of casein aggregates. Unrestricted diffusion of casein aggregates was measured for all concentrations at short observation times ( approximately 20ms). Despite a near uniform size distribution on increasing Na-caseinate concentration the measured unrestricted diffusion coefficient was a decreasing function of Na-caseinate concentration. Enhanced packing interaction between the aggregates and the slight augmentation of the large tail in the size distribution is the main reason for this observed decrease. On increasing the experimental observation times restricted diffusion of the aggregates is measured. The rheological response of the dispersions was investigated. The stress evolution of the sample with time exhibits three distinct behaviours, irrespective of Na-caseinate concentration and applied shear ...Continue Reading

References

Jun 1, 2005·Journal of Colloid and Interface Science·Maud PanouilléTaco Nicolai

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Citations

Jun 25, 2014·Metabolites·Anthony D Maher, Simone J Rochfort
May 21, 2013·Journal of Colloid and Interface Science·Hui Lin Tan, Kathryn M McGrath
Jun 20, 2012·Journal of Colloid and Interface Science·Hui Lin Tan, Kathryn M McGrath
Sep 7, 2012·The Journal of Physical Chemistry. B·Antoine BouchouxFrançois Mariette

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