Influence of fluidized bed drying technology on the pasting properties of paddy rice

The drying qualities of paddy were investigated under fluidized bed drying- tempering,and the effects of a series factors,such as temperatures,tempering time and precipitation rates were also studied.In addition,a correlated analysis between insoluble amylose content and RVA profile parameters was also conducted. The results showed that precipitation rates( 1.5%,2.25%,3.0%),tempering time( 1,2,3 h) and drying temperature( 45,50,55,60,65 ℃) had significant effects on insoluble amylose content( IAC),peak viscosity( PKV),breakdown value( BDV) and setback viscosity( SKV)( p < 0.01) of paddy.Besides,the interaction between precipitation rates and tempering time also had significant effects on IAC and BDV values( p <0.05).AC and SKV values had significant negative correlation with BDV( p < 0.01),while PKV had a significant positive correlation with BDV values( p < 0.01). The results of IAC,PKV,BDV and SKV were 9.29% ± 0.37%,( 2282 ± 13.09) c P,( 755 ± 27) c P and( 906 ± 98) c P,respectively,under the conditions which were drying at 45 ℃,moisture decreasing at 1.5%per step and tempering for 3 h.