Abstract: Method on preparation of polysaccharides from jujube(Ziziphus jujuba MILL.)fruit residue after extraction of jujube essence had been carried out. The enzyme method was optimized by orthogonal test with polysaccharides content and yield ratio as index.The purification process was examined with the rate of decolouration and desalination as index.The optimum conditions are: 3% of trypsin, 65℃, pH value 7 and extracted 1.5 h,then adding 2.0% of papain at 55℃ and extracted 1 h.The extracted solution was then decolorized through macro-reticular adsorption resin column followed by cation and anion exchange resin columns alternatively for desalting to obtain the purified polysaccharides.

Key words: Zizyphus jujuba MILL.residues, polysaccharide