Functional Properties of Extruded Rice Flours

ABSTRACT The functional properties of a long‐grain and a short‐grain rice flour extruded at 70 to 120°C and 22% moisture are reported. The bulk densities essentially stayed unchanged. Both water absorption and water solubility indices increased with an increase in extrusion temperature. The fat absorption indices decreased only at 55°C. The cold‐paste viscosities progressively increased, whereas the peak, breakdown, setback, and final viscosities decreased with an increase in extrusion temperature. A substitution of 25% of unextruded or 70°C extruded long‐grain rice flour into a wheat flour‐based fried snack decreased its fat absorption by 35% to 50% without affecting the overall texture.