Study on Synthesis and Application of Starch Octenylsuccinate

The objective of this study was to obtain the best preparation process of octenyl succinic anhydride modified starch,(OSA starch) ,taking slightly hydrolyzed 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 concentration 50%,pH 8.5,reaction temperature 35 ℃and reaction time 4 h,respectively. The DS of octenyl succinic anhydride modified starch under these conditions is 0.0495. The structures of the octenyl succinic anhydride modified starch are verified by infrared spectrum analysis. Using it as emulsifier for the microencapsulation of docosahexaenoic acid(DHA) spirulina oil,good results are obtained.