Abstract: In this study, a method of banana polysaccharide isolation and purification was set up and the physical and chemicalcharacteristics of banana polysaccharide was also analyzed. Product Lens was obrained when banana polysaccharide wasclassified with 40% ethanol, and a single apex was obtained in the Sephadex G-150 gel chromatogaphy analysis.The monosac-charide components of the acidic solution of Lens5 were identified as glucose and xylose according to the results of paperchromatography and thin-layer chromatography analysis. The molecular weight of Len5 is 43000 Dalton according to the resultof Sephadex G-150 gel chromatography analysis.

Key words: banana, polysaccharide, isolation and purification, physical and chemical characteristic