Abstract: A novel method of the preparation for the high carboxyl groups and soluble oxidized corn starch was studied. The experimental conditions were optimized, the amount of sodium hydroxide, reaction temperature and time were 21 g, 100 ℃ and 3.0 h,respectively. And the carboxyl content in the oxidized corn starch reached 3.60% under the optimized conditions. The oxidized mechanism was investigated with Xray diffraction (XRD), Scanning electron microscopy (SEM), Infrared (IR) spectroscopy and the analyses of carboxyl and carbonyl content carried out by using chemical analysis method.

Key words: native cornstarch, oxidized starch, oxidized mechanism, carboxyl group, carbonyl group