Preparation and properties of starch octenylsuccinate

The objective of this study was to obtain the best preparation process of octenyl succinic anhydride modified starch(OSA starch), taking cassava starch as raw material and degree of substitution (DS) as evaluation index. Five parameters in the process, namely initial starch slurry concentration, pH, reaction temperature, reaction time and anhydrides concentration were investigated. Single-factor and orthogonal test results showed that the optimal parameters are initial starch slurry concentration35%, pH8.5, reaction temperature 35 ℃ and reaction time 3.5 h, respectively. The DS of octenyl succinic anhydride modified starch under these conditions is 0.02. In the same study, reduce the starch milk initial concentration, and improve the product substitution degree. The structures of the octenyl succinic anhydride modified starch are verified by infrared spectrum and differential scanning calorimetry analysis. And with cassava starch structure made the contrast.