Native waxy corn starch was used as the raw material to prepare glutaric acid starch ester(EGAS), with glutaric anhydride(GA) as the esterifying agent and ethanol as the solvent. The structural characteristics and physicochemical properties of the samples were determined by Fourier transform infrared(FT-IR) spectroscopy), Brabender viscoamylography, scanning electron microscopy(SEM), and X-ray diffraction(XRD). The results indicated that two new absorption peaks of EGAS appeared at 1730 cm~(-1) and 1565 cm~...