Abstract: Retrograded starch(RS3) was produced by raw starch corn. Some common physical characteristics of RS3 were studiedat the same time. The experiment results showed that the four influencing factors affecting RS3 yield were water added, pastingtime, retrograding time and temperature. The retrograding yield rate was heavily affected by the paste time and retrograding time,while water added and retrograding temperature showed little effect on yield rate. The optimum conditions of retrograding processwere obtained by using orthogonal design of L9(34) as follows: 3 times water added, pasting time 1h, retrograding temperature3℃, and retrograding time 36h. The physical characteristics study on RS3 showed that: when RS3 granules were small and irregularand water holding expansibility was also low, it was suitable for gravity precipitating and centrifugation precipitating. There wasno influence on precipitating speed while acid was added.

Key words: corn, RS3(retrograded starch), producing technique, physical, characteristics