Abstract: A simple method for preparation of non-crystallization starch granules(NCSG)was reported.Maize starch was treated with mixtures of ethanol and NaOH solutions at a controlled temperature.The treated starch was then neutralized with HCI,washed,and dried at 50℃for 6 h.No polarization crosses appeared when the NCSG starches were examined under polarized- light microscope,which indicated changes of crystalline structures.Crystillity of starch was compared between the treated sample with native starch with X-ray diffraction patterns.The resulting starches displayed most of crystalline structure changed to non- crystalline structure.Light microscope pictures showed NCSG remained intact granules.Scanning electron micrographs(SEM) showed that the surfaces of NCSG lost flatness or smoothness,and became rough or accidental.Different reaction conditions gave different appearances of granules.Lesser concentrations of ethanol,greater concentrations of NaOH or higher reaction tempera- tures gave the indented rough appearances,otherwise,the smooth appearances.

Key words:  , NCSG； crystillity； treatment；