Increasing Retrogradation Rate of Sweet Potato Starch by Method of Combined Electrolysis and Microwave Treatment

Taking sweet potato starch as raw material and retrogradation rate as an inspection target,the effects of sequence of microwave wave and electrolysis treatments on retrogradation rate of sweet potato were discussed in this experiment.The best process sequence was: Starch→ Pasting → Autoclaving → Microwave → Electrolysis → Aging → Hydrolysis → Centrifugal →Drying and the best technical factors were: ratio of starch and water 5%,high-pressured temperature and treating time 120 ℃,30 min,pasting temperature and treating time 90 ℃,30 min,microwave power and treating time 400 W,4 min,Electrolytic voltage and treating time 90 V,2 min,aging temperature 4 ℃,aging time 12 h.The highest retrogradation rate of sweet potato starch at the optimum conditions was 24%,which was 100% higher than that of control group 12%.