Preparation and Physicochemical Properties of Octenyl Succinic Anhydride Modified Early Indica Rice Starches

Octenyl succinic anhydride(OSA) modified early indica rice starch was prepared in aqueous slurry systems using response surface methodology.The physicochemical properties of the OSA starches were also investigated.The results indicated that the optimal parameters for the preparation of OSA starch from early indica rice starch were as follows: reaction period: 4 h,temperature: 33.4 ℃,pH of reaction system: 8.4,concentration of starch slurry: 36.8 %(in proportion to water,g·g-1).The degree of substitution was 0.018 9 and the reaction efficiency was 81.5%.OSA groups acted by first attacking the surface and some pores formed.The starch derivatives gelatinized at lower temperature with increased OSA modification.As the degree of substitution increased from 0 to 0.025,the TP decreased from 71.54 ℃ to 69.31 ℃.