A Sepharose CL-2B (Pharmacia Biotech AB, Uppsala, Sweden) column (2.6 · 90 cm) was used for hot air fluidizedbed puffed pregelatinized rice flour and a TSK HW 75(F) (Tosoh Corp., Tokyo, Japan) column (2.6 · 85 cm) was used for gun-puffed pregelatinized rice flour.