2010 Volume 74 Issue 8 Pages 1598-1605
The dependence of the dynamic viscoelastic parameters of carboxymethylcellulose (CMC), xanthan gum, and guar gum solutions on the angular frequency (ω) was compared with that of their viscosity (μ) on the shear rate (γ). In addition, the effect of these rheological properties on the maximum velocity through the pharynx, Vmax, as measured by the ultrasonic pulse Doppler method, was investigated. The CMC and guar gum solutions examined were taken as a dilute solution and a true polymer solution, respectively. The xanthan gum solution was taken as a weak gel above 0.5% and a true polymer solution below 0.2%. The maximum velocity, Vmax, of the thickener solutions correlated well with μ, the dynamic viscosity η′, and the complex viscosity η*, especially those measured at γ or ω of 20–30 s−1 (or rad/s) and above, suggesting that μ, η′, and η* are suitable indexes for care foods of the liquid type for dysphagic patients.
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