Suspension stability and size distribution of particles in reconstituted, commercial calcium caseinates
2000
Moughal, K.I. | Munro, P.A. | Singh, H.
Four commercial calcium caseinates were reconstituted in water and various properties of the particles or aggregates were determined. Particle size distribution was determined with a Malvern Mastersizer. All the dispersions exhibited bimodal particle size distributions with modes at about 0.4 and 10 micrometer. The particle size distributions changed quite rapidly for the first 2 h after reconstitution and then changed more slowly for up to 6 h. The mode of the first peak did not change significantly during this time, but the mode of the second peak decreased. It appeared that the larger particles were either dissociating into smaller particles or dissolving with time. The sample with the lowest suspension stability had the largest particles. Sediment formed by centrifuging the dispersions at 700g had a moisture content of about 77% and was slightly enriched in ash compared to the original dispersion. The density of the hydrated sediment was calculated from the sediment composition to be about 1073 kg m(-3). This appears to be much higher than the density of the sedimenting particles as estimated from Stokes law.
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