Preparation Of The Double Modified Sweet Potato Starch By The Cationic And Acetic

In order to develop the new use of sweet potato starch, extend its use range, andfit the require of industrialization production, this experiment studied systematicallyfor the first time on the preparation and characteristic analysis of the double modifiedsweet potato starch by the cationic etherization and acetic esterification, by exploringthe reaction condition and production technology, the best new technology and newidea are provided on preparing the double modified sweet potato starch.The research paper includes mainly four aspects:(1) The acetic ester starch was preparedIn this paper, the preparation of acetate starch with the sweet potato starch asthe raw material was described. The optimum conditions of the preparation oflow-degree of substitution acetate starch were: starch:acetic anhydride =16: 1,reaction pH 8.0-8.5, reaction temperature 25-30℃, reaction time 1h. The acetycontent was 1.86%, the degree of substitution was 0.0714.(2) The anode ion starch was prepared.The optimum reaction conditions for preparing anode ion starch were: pH was11, reaction time was 5h, mihuaji quantity were 25% of starch quantity, reactiontemperature was 50℃.the replacing degree was 0.034.(3) The two kinds of technology that prepare the anode ion acetic ester doublemodified sweet potato starch were exploreBy studying the change of replacing degree of the anode ion and acetic ester,the two technology which preparthe two kinds of the double modified starch werecontrasted, the best technology was first anode ion next acetic, the optimum reactionconditions is: reaction temperature was 25℃, reaction time was 2h, reaction pH was8.0,cusuangan quantity were 3.8% of starch quantity, the replacing degree of aceticester starch was 0.075, the replacing degree of anode ion starch was 0.072.(4) The characteristic analysis of original sweet potato and its kinds ofmodified starchThrough study the replacing degree,viscosity of the anode ion,acetic estercompositing denature starch and its thermal stability, we drew a conclusion that thereplacing degree of anode ion-acetic ester compositing denature starch was not onlyhigh than the single denature starch, but also its the viscosity was very low, the thermal stability of starch viscosity was greatly increased.