Hematopoietic, myeloprotecting, antitumor immune cells generating and radiosensitizing polysaccharide isolated from Panax ginseng

A polysaccharide composition having hematopoietic, myeloprotecting, antitumor immune cell generating, and radiosensitizing activities extracted from the roots of Panax ginseng comprising 6 fractions of polysaccharide having molecular weights of 1,800,000˜2,200,000, 1,350,000˜1,650,000, 620,000˜780,000, 105,000˜130,000, 23,000˜27,000, 5,000˜6,000 dalton, with weight ratios of 11.4˜13.4:3.6˜4.2:4.5˜5.1:0.7˜0.9:40.1˜48.1:31.0˜37.0, respectively, consisting of α(1→6) linked D-glucopyranose units with partly α(1→3) linked branches,

• wherein said 6 fractions of polysaccharide are prepared by the steps of:
• i) obtaining a residue by extracting 1 wt part of ginseng root with 2˜4 wt part of methanol;
• ii) extracting and obtaining a water soluble fraction from the residue in step i) using 3˜5 wt part of distilled water;
• iii) freeze-drying the obtained water soluble fraction in step ii);
• iv) obtaining an inner fraction using the dialysis membrane after obtaining an insoluble fraction from the freeze-dried fraction in step iii);
• v) obtaining the 6 fractions by sephacryl S-500 gel chromatography;
• and
• vi) passing the polysaccharide composition obtained in step v) through DEAE-sephadex A-50 chromatography,
• and said 6 fractions of polysaccharide comprises more than 98.5% amount of carbohydrates moiety and less than 1.0% amount of proteins moiety by quantitative determination.