Optimized Production of the Highly Moisture-Absorbing Citrate Starch by the Utilization of Microwave-Ass

Abstract:

It is known from single factor test that reaction temperature，reaction time，pH value，concentration of citric acid，microwave time and microwave power all affect the water absorption ratio of the citrate starch. Four main factors was selected to carry out the response surface methodology analysis baesd on the single factor test. The results show that at the following conditions:pH 3.48，reaction temperature 126 ℃，reaction time 6.0 h，microwave reaction time 7min，addition amount of citric acid 15% and reaction of microwave power 640 W，the water absorption ratio of the prepared citrate starch reaches 760.83%. The relative error is 0.518% compared with predicted value 764.771%. There is no significant deference between the predicted and the experiment value，which indicates that the degree of fitting was good.