Retrogradation kinetics of rice starch paste

The retrogradation kinetics property of rice starch paste derived from indica rice, japonica rice and glutinous rice was studied using a rotary rheometer. Results indicated that the retrogradation of starch paste approaches the first order chemical reaction model with the reaction order slightly higher than 1. The retrogradation kinetics properties of starch paste can be described accurately by flow behavior index. Retrogradation is related to the properties of both the continuous phase and disperse phase. Equation precision was the highest when the parameters of flow behavior index of continuous phase and the sedimentation ratio of disperse phase were introduced to the model. The interaction of amylose and amylopectin of the paste lead to increase of retrogradation.