Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles
Small micellar casein particles were formed in aqueous solutions of native casein after addition of polyphosphate. These so-called submicelles aggregated and gelled with a rate that increased with increasing temperature. The evolution of the viscosity during this process was determined at constant s...
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2008-04-01
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Online Access: | https://doi.org/10.1515/arh-2008-0005 |
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doaj-56e5a689bb1a4dd2aa58679203e4714d2021-09-06T19:40:02ZengDe GruyterApplied Rheology1617-81062008-04-0118223050-123050-710.1515/arh-2008-0005Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein ParticlesPitkowski Anne0Nicolai Taco1Durand Dominique2Polymères, Colloïdes, Interfaces, UMR-CNRS, Université du Maine, 72085le Mans Cedex 9, FrancePolymères, Colloïdes, Interfaces, UMR-CNRS, Université du Maine, 72085le Mans Cedex 9, FrancePolymères, Colloïdes, Interfaces, UMR-CNRS, Université du Maine, 72085le Mans Cedex 9, FranceSmall micellar casein particles were formed in aqueous solutions of native casein after addition of polyphosphate. These so-called submicelles aggregated and gelled with a rate that increased with increasing temperature. The evolution of the viscosity during this process was determined at constant shear rate or shear stress. When applying a small shear stress the viscosity increased strongly until the shear rate became immeasurably slow, but when the applied shear stress exceeded a critical value (σc) the aggregates broke up and the viscosity reached a maximum. At longer times the viscosity decreased rapidly at first, followed by a very slow decrease. σc was independent of the shear rate and heating temperature, but increased strongly with increasing casein concentration. At constant shear rate the stress remained close to σc, but fluctuated irregularly. After cessation of shear flow, gels were formed rapidly. Oscillation shear measurements for σ > σc showed a strongly non-linear response at the time of maximum viscosity.https://doi.org/10.1515/arh-2008-0005caseinsubmicelleviscositygelshear flowlarge amplitude oscillation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Pitkowski Anne Nicolai Taco Durand Dominique |
spellingShingle |
Pitkowski Anne Nicolai Taco Durand Dominique Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles Applied Rheology casein submicelle viscosity gel shear flow large amplitude oscillation |
author_facet |
Pitkowski Anne Nicolai Taco Durand Dominique |
author_sort |
Pitkowski Anne |
title |
Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles |
title_short |
Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles |
title_full |
Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles |
title_fullStr |
Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles |
title_full_unstemmed |
Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles |
title_sort |
shear flow and large amplitude oscillation shear study of solutions of aggregating micellar casein particles |
publisher |
De Gruyter |
series |
Applied Rheology |
issn |
1617-8106 |
publishDate |
2008-04-01 |
description |
Small micellar casein particles were formed in aqueous solutions of native casein after addition of polyphosphate. These so-called submicelles aggregated and gelled with a rate that increased with increasing temperature. The evolution of the viscosity during this process was determined at constant shear rate or shear stress. When applying a small shear stress the viscosity increased strongly until the shear rate became immeasurably slow, but when the applied shear stress exceeded a critical value (σc) the aggregates broke up and the viscosity reached a maximum. At longer times the viscosity decreased rapidly at first, followed by a very slow decrease. σc was independent of the shear rate and heating temperature, but increased strongly with increasing casein concentration. At constant shear rate the stress remained close to σc, but fluctuated irregularly. After cessation of shear flow, gels were formed rapidly. Oscillation shear measurements for σ > σc showed a strongly non-linear response at the time of maximum viscosity. |
topic |
casein submicelle viscosity gel shear flow large amplitude oscillation |
url |
https://doi.org/10.1515/arh-2008-0005 |
work_keys_str_mv |
AT pitkowskianne shearflowandlargeamplitudeoscillationshearstudyofsolutionsofaggregatingmicellarcaseinparticles AT nicolaitaco shearflowandlargeamplitudeoscillationshearstudyofsolutionsofaggregatingmicellarcaseinparticles AT duranddominique shearflowandlargeamplitudeoscillationshearstudyofsolutionsofaggregatingmicellarcaseinparticles |
_version_ |
1717769456512401408 |