The effect of heat moisture treatment on physicochemical properties of early indica rice

Abstract

Early indica rice was heat-moisture treated at different temperature (90°C, 100°C and 110°C) for 3h, 5h and 7h at a moisture content of 28%, respectively. The effects of heat-moisture treatment (HMT) on the amylose content, pasting properties, texture properties, solubility and swelling power of early indica rice were studied. After HMT at 110°C for 7h, the amylose content of early indica rice increased from 25.2% to 30.6%, and its pasting temperature increased from 80.1°C to 92.2°C; the peak viscosity, trough viscosity and final viscosity were all decreased significantly. Both the solubility and the swelling power of early indica rice starches decreased after 110°C 7h heat-moisture treatment. The gel hardness of early indica rice increased significantly, but the adhesiveness decreased after HMT.