Extraction of Dietary Fiber from Red Jujube Residue by Ultrasonic-Enzymatic Hydrolysis Synergistic Action and Its Promoting Digestion Function

The insoluble dietary fiber of red date residue was extracted by ultrasonic-enzymatic hydrolysis from Xinjiang jujube(remove polysaccharide)and the effect of ultrasonic-enzyme-assisted extraction technology on the extraction of dietary fiber from red date residue was studied. At the same time,the dietary fiber of red date residue was used as the base material to prepare high dietary fiber edible powder and its digestive function was studied. The result showed that the optimum extraction conditions of dietary fiber from jujube residue were as follows:enzyme dosage 1.5%,solid to liquid ratio 1:10 g/mL,ultrasonic time 35 min and ultrasonic temperature 70 ℃. Under these optimum conditions,the extraction rate of ultrasonic-enzyme-assisted extraction technology was up to 69.31%±0.91% and the content of total dietary fiber was about 26.5%,among them the content of insoluble dietary fiber was up to 21.7%,and the content of soluble dietary was 4.8%. This suggested that high dietary fiber powder middle dose(2.7 g/kg)and high dose(5.3 g/kg)administered to mice could promote digestion and defecation function.