Research on the Modification of Wheat Starch with Octenyl Succinic Anhydride

In order to improve the properties of wheat starch,octenyl succinic anhydride(OSA) modified wheat starch was prepared using aqueous slurry system.The surface structure,viscosity,paste clarity and retrogradation of the products were investigated.The results showed that the suitable parameters for the preparation of OSA modified wheat starch were selected as follows: reaction time 3 h,pH 8.0,temperature 35 ℃,the concentration of starch slurry 35 %(in proportion to water,w/w),amount of OSA 3.0%~7.0%(in proportion to starch,w/w).After OSA modification,the degree of substitution was 0.012 4~0.019 4.Photomicrographs by scanning electron microscopy revealed that OSA groups acted by attacking the surface and some hollows formed.The pasting property results indicated that after OSA modification,the starch derivatives had higher viscosities,paste clarity and decreased retrogradation.These results could be used as a reference for the application of OSA modified wheat starch in food industry.