Extraction of Soluble Dietary Fiber FromZizyphus jujube by Methods of Alkali Solution and Alcohol Precipitation

Water-Soluble Dietary Fiber(SDF)extraction process was studied combining methods of alkali solution and alcohol precipitation by using wild Zizyphus jujube as raw material.Based on the single factor experiment,orthogonal experiment on influence of A(NaOH concentration),B(the ratio of material to liquid),C(extraction temperature),D(extraction time)on the yield of soluble dietary fiber from the Zizyphus jujube was processed.The results showed that the impact of these factors on the yield of dietary fiber extracted fromZizyphus jujube slag was ACBD;the optimum extraction process of soluble dietary fiber was temperature of 90℃,ratio of material to liquid of 1∶8g/mL,NaOH concentration of 8%,water bath time of 60 min.Under this optimized condition,yield of the soluble dietary fiber could be up to 40.42%.