Study on the rheological character of sago starch paste

Rheological behavior of sago starch paste was studied at various shear rate,concentration,and temperature ranges by the Brookfield rotating viscometer,in order to provide the theoretical basis of the application of sago starch in the food industry. The results showed that the starch paste was a non-Newtonian flow system. The temperature,the concentration and the shear rate all influenced the rheological character:at the same concentration and shear rate,the apparent viscosity was lower when the temperature increased,and at the same temperature and shear rate,the apparent viscosity was higher when the concentration increased,meanwhile the apparent viscosity was lower when the shear rate increased with the same temperature and concentration. Sago starch paste exhibited shear-thinning(pseudoplastic)behavior. Its anti-shearing ability is superior to potato starch paste and cassava starch paste. At the same time,sago starch paste has the thixotropic property,because there is a lag circle between the two rheological curves of the sago starch with the shear rate changes from 6r/min to 100r/min and from 100r/min to 6r/min.