Oxidized starch was prepared using corn starch as the raw material and NaClO as the oxidant catalyzed with a complex catalyst 2,2,6,6tetramethylpiperidine1oxyl (TEMPO) and NaBr. Effects of the amount of NaClO, pH of reaction media, reaction temperature and reaction time on the yield and carboxyl group content of oxidized starch were investigated. The suitable oxidation conditions were determined as follows: the amounts of NaClO was 35 % (based on the weight of corn starch) respectively, pH of reaction media was 105, reaction temperature was 0 ℃, reaction time was 25 h. The content of carboxyl group of the oxidized starch obtained on the aforesaid conditions reached 530 %, and the yield of oxidized starch was 888 %. Furthermore, the structure and the application properties of oxidized cornstarch were characterized by IR and SEM. Comparing to raw starch, the paste viscosity of the oxidized starch decreased from 100 mPa·s to 30 mPa·s, and transmittance of paste liquid increased from 4786 % to 9419 %.
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