Using grain amaranth as raw material,the physicochemical properties of grain amaranth starch were studied and compared with grain amaranth powder.The results showed that grain amaranth powder had different size,irregular shape and non-smooth surface,while grain amaranth starch granules had regular shape,smooth surface and orderly arrangement.The gelatinization characteristic curves of grain amaranth powder and starch were similar,and the gelatinization degree was low.The gelatinization temperature ranges from 66.3 to 80.0℃and 65.5 to 80.0℃,re...