Rice flours were prepared by blending samples and water
(60:40, g/mL). Then the flours were kept at room temperature for
moisture equilibration. After that, the flours were extruded in a
POLYLAB twin screw extruder (Thermo Fisher Scientific, America).
The screw of the extruder was divided into 4 zones, with temperatures
set at 55:65:90:80 C (zone1:zone2:zone3:zone4). The
screw speed was set at 90 r/min. Finally, the extruded rice noodles
were cooled at 4 C for 3 h and sealed in polyethylene bags for
further analysis.