Abstract: The rheological properties of sols from 16 different indica rice varieties were determined using a rotational viscometer. The influences of temperature and rice variety on viscosity coefficient and flow behavior index were analyzed. Meanwhile, the correlation between sol characteristics and free amino acid content was investigated. The results showed that the shear stress of indica rice sols was positively correlated with shear rate but negatively correlated with temperature. Both the viscosity coefficient (k) and flow behavior index (m) were dependent upon temperature. There was a negative correlation between k and temperature. Rice sols were very unstable at low temperatures. Rice sols from Yuhong, Yuchi, Jinyou 402, Liangyou 103 and Liangyou 106 exhibited a stable flow behavior index and thermally stable molecules. The viscosity coefficient (k) increased, whereas the flow behavior index (m) declined with increasing free amino acid content.

Key words: indica rice, sol, rheology properties