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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)
ISSN:2141-7016
| Abstract: Viscosity and fluidity profiles of a starch solution with a water-starch ratio of 2.0w/w during gelatinisation under strong alkali conditions, in a Co-axial cylinder viscometer for 17g/dm3 - 23g/dm3 concentrations of NaOH solution was studied. This work models the variation of the equilibrium viscosity, equilibrium fluidity, gelatinization rate, gelatinization constant and delay time with Sodium hydroxide concentration. The equilibrium fluidity and delay time were fit to third and second order polynomials respectively, while the gelatinization rate and equilibrium viscosity fit to first and second order Gaussian models respectively and the gelatinization constant to a rational function with R2 > 0.99 in all cases. These parameters and models can be used to simulate starch gelatinization beyond the range of experimental data. |
| Keywords: starch, gelatinisation, viscosity, fluidity, rheological, equilibrium |
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