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Anne-Laure Koliandris, Elisabeth Rondeau, Louise Hewson, Joanne Hort, Andrew J. Taylor, Justin Cooper-White, Bettina Wolf.Br>
Food grade Boger fluids for sensory studies
Appl. Rheol. 21:1 (2011) 13777 (11 pages)
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The effect of shear viscosity on taste and mouthfeel perception has been extensively studied; however, the effect of extensional
viscosity on sensory perception has been mostly neglected. This may be important as in-mouth processing is complex
and probably best described as a superposition of shear and extensional flow characteristics. Fluid mechanics researchers
interested in separating elastic effects from viscous effects use Boger fluids and this approach was adopted here to investigate
the effect of fluid elasticity on sensory perception. For the first time, two food grade Boger fluids based on glucose syrup
and aqueous solutions of maltodextrin as solvents and xanthan gum as high molecular weight polymer were formulated.
The elasticity of the Boger fluids was characterised in rotational shear rheometry, in a filament break-up device and in microcontraction
flow. Saltiness perception and mouthfeel of the Boger fluids and samples corresponding to the respective solvent
were analysed. Surprisingly, there were no significant differences. Hypotheses attributing this finding to the intrinsic properties
of the samples are discussed. A major study would be required to gain in-depth understanding of the sensory properties
of these fluids as their flow properties are very different from typical liquid foods.
► Cite this publication as follows:
Koliandris A, Rondeau E, Hewson L, Hort J, Taylor AJ, Cooper-White JJ, Wolf B: Food grade Boger fluids for sensory studies, Appl. Rheol. 21 (2011) 13777.
Bernhard Gleich, Thomas Weyh, Bernhard Wolf.Br>
Magnetic Drug Targeting: an analytical model for the influence of blood properties on particle trajectories
Appl. Rheol. 18:5 (2008) 52023 (7 pages)
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Investigations on the behaviour of superparamagnetic nanoparticles under the influence of a high gradient magnetic field
in the vascular system is required for a better under-standing of magnetic drug targeting. The influence on the particle transport
of the non-Newtonian and Newtonian properties of blood as well as the influence of the heart rate was therefore studied.
An analytical model was developed and the calculation of particle trajectories is presented and evaluated.The results show
that the non-Newtonian properties of the blood have a positive influence on the number of retended nanoparticles. The calculations
also showed that the number of retained nanoparticles was lower in oscillatory flow profile than in steady flow.
The influence of the heart rate can be neglected for Womersley numbers smaller than 1.5.
► Cite this publication as follows:
Gleich B, Weyh T, Wolf B: Magnetic Drug Targeting: an analytical model for the influence of blood properties on particle trajectories, Appl. Rheol. 18 (2008) 52023.
B Wolf, EJ Windhab
Interfacial Rheology of Deformable Droplets in Viscometric Flows
Appl. Rheol. 5:4 (1995) 182
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► Cite this publication as follows:
Wolf B, Windhab EJ: Interfacial Rheology of Deformable Droplets in Viscometric Flows, Appl. Rheol. 5 (1995) 182.
EJ Windhab, B Wolf.Br>
Investigation of the Rheological Behaviour of Small Droplets in Emulsions
Appl. Rheol. 1:1 (1991) 17
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► Cite this publication as follows:
Windhab EJ, Wolf B: Investigation of the Rheological Behaviour of Small Droplets in Emulsions, Appl. Rheol. 1 (1991) 17.
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