Formation conditions and pore forming process of porous corn starch

Corn starch was used as raw materials to investigate the effect of enzymatic hydrolysis conditions on the law of native corn starch hydrolysis.Changes of granule morphology,crystal structure and amylose content were also studied by scanning electron microscope and x-ray diffractometer during the pore forming process.The results indicated that the enzymatic hydrolysis conditions had relatively significant effects on the production of porous starch,and the hydrolysis rate could be controlled by changing the reaction factors such as enzyme con-centration,reaction time and temperature.During the production process of porous starch,starch granule integrity was destroyed.The degree of crystallinity of the processed corn starch and the amylose content increased at first,and then decreased.In the meantime,the diffraction curve of corn starch still kept a A-type diffraction pattern,which meant that the crystal structure ordering had a limited change.