Rheological Studies on Potato Starch

Part VI. Dynamic Viscoelastic Properties of Potato Starch Solutions in 1 N Potassium Hydroxide

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The dynamic modulus and dynamic viscosity of the potato starch solution in 1 N KOH, 2.0g to 7.0g/100 ml, were measured with a forced torsional vibration rheometer at various frequencies at 25°C. The starch solutions irradiated by gamma ray were also measured similarly.
The master curves of the dynamic modulus and dynamic viscosity were derived ac-cording to Ferry's time-concentration reduction principle. The concentration dependences of the dynamic modulus G'∝C^m, the dynamic viscosity η_d∝C^n', and of the zero angular frequency viscosity η/η_O∝Cⁿ were determined.
The relaxation spectra of starch solutions were obtained as curves of nearly linear shape and those of the irradiated starch solutions shifted to shorter relaxation time with steeper inclinations.