Abstract: To obtain the rice starch with satisfactory surface effect and small size effect,milling superfine comminution technique study was employed in this study,and the particle size,hydratability and powder characteristics of the rice starch were determined. The results showed that the particle size of rice starch is decreased by superfine comminution technique from 2639.9 nm to 166.8 nm. With the particle size decreasing,the hydratability increases remarkably. The specific surface increases from 0.9393 m2/g to 1.3523 m2/g,the expansive force increases from 1.3 ml/g to 2.32 ml/g,the water retention ability increases from 2.17 g/ g to 4.44 g/g,the powder fluidity and filling performance increase,and the dispersion increases from 83.1% to 87%. These results indicated that the obtained superfine rice starch has satisfactory physico-chemical characteristics,can be widely applied in the future.

Key words: rice starch, superfine comminution