Abstract:

In order to develop an optimal preparation procedure of water soluble dietary fiber from jujube fruit residues by a combined technology of enzymolysis with glucoamylase and cellulase and alkaline hydrolysis, single factor and orthogonal array design experiments were carried out. Results showed that the optimum preparation procedure was based on 60 min enzymolysis with a glucoamylase dose of 0.4% and a cellulase dose of 0.5% and 90 min alkaline hydrolysis at pH 12, 70 ℃; under such conditions, the yield of dietary fiber reached 11.23%, and the water holding capacity and swelling capacity of dietary fiber product were 848.68% and 9.26 ml/g, respectively.

Key words: jujube fruit residues, soluble dietary fiber, glucoamylase and celluase and alkaline by hydrolysis, preparation