Research on technology of preparing potato cationic starch by ultrasound-assisted half-dry method

The potato cationic starch was prepared using potato starch as a material,2,3-epoxypropyl trimethyl ammonium chloride as a etherifying reagent and sodium hydroxide as a catalyst by the ultrasound-assisted half-dry method. On the basis of the experiment of the single factor,the technology parameters for preparing potato cationic starch were optimized by response surface methodology. The results showed that the optimum technology conditions were as follow:ultrasonic power 115 W,ultrasonic time 40 min,etherification temperature60 ℃,etherification time 3 h. Under the optimal technological conditions,the degree of substitution was 0.141,and the reaction efficiency was 85.16%. The ultrasonic treatment could significantly improve the degree of substitution and reaction efficiency of potato cationic starch.