The rice ( Oryza sativa L. ) powder can be separated into four components: non starch component, amylose, amylopectin and intermediary fraction. The four components were light yellow dense powder, white loose powder, vitrescence and pellicular materials respectively. Scanning electron microscopic images showed that the non starch component as large dense blocks, amylose as small loose granules, and amylopectin was made up of fine particles with narrow cracks on its cross section. The structure of inter...