Effects of Concentrations/Temperatures on Rheological Properties of Konjac Glucomannan (KGM)

This work studied the effects of konjac glucomannan (KGM) concentrations and temperatures on the shear stress-shear rate curve of KGM solution. The results indicated that KGM solution was non-Newtonian Fluid and displayed the characteristics of pseudoplastic fluid. For the temperature, under the shear force to KGM solution, the shear stress increased with the decrease of temperature. With the raise of the concentration of KGM solution (0.3%~1.5% w/w), the increment extent for the shear stress would be enhanced with the decrease of temperature. As for the concentration, the shear stress showed the growth trend with the increment of KGM concentration (0.3%~1.5%). Also, with the rise of temperature, the increase extent for the shear stress showed a reduction trend. Under the temperature of 55~65℃, the shear rate did not display the increment trend when the KGM concentration increased from 1.2% (w/w) to 1.5% (w/w). Therefore, the shear stress of the KGM solution can be reduced by increasing the temperature and decreasing the concentration.