INVESTIGADORES
ZORRILLA Susana
artículos
Título:
Rheological modelling of dispersions of casein micelles considered as microgel particles
Autor/es:
OLIVARES, ML; BERLI, CLA; ZORRILLA, SE
Revista:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 436 p. 337 - 342
ISSN:
0927-7757
Resumen:
Rheological behavior of
dispersions of casein micelles (CM) was predicted through a viscosity model in
which CM were considered as microgel particles. A simple structure for CM
composed of a spherical core with a brush of k-casein
was considered. An explicit relationship between viscosity and shear stress
allows obtaining key parameters such as the packing fractions corresponding to
the shear stress limits and the critical shear stress closely related to the
total interaction potential between two CM. The analysis of the model
parameters fitted from experimental viscosity curves indicates that CM at
concentrated regime behave as soft spheres. In addition, the model provides the
pair interaction energy between CM directly from rheometric data. The values
obtained agree with a DLVO-like theory previously proposed for CM. Indeed,
using independent experimental data and parameters, it was possible to cross
check both models. The results obtained are very promising for studying CM
dispersions as colloidal systems and the stability of dairy products under
different physicochemical environments.