Abstract:Two homogeneous acidic heteroglycans DHP-1 hnd DHP-2 were obtained from the root of Rheum palmatum, the mean molecular weights being 11×104 and 2.5×104 respective. It was identified by TLC and GC that both heteroglycans contain the same main residues of glucose, galactose, arabinose, rhamnose, lyxose, xylose, glucuronic acid and galacturonic acid.