【Abstract】 A water-soluble crude polysaccharide was isolated from the stem of the wild Cistanche deserticola Ma. It was deproteinized by Sevage method and proteinase method, and fractionated by ultrafiltration and Sephadex G-75 column chromatography. A polysaccharide fraction SPA was collected. The polysaccharide of SPA consisted of Rha, Ara, Man, Gal and Glc in the molar ratio of 1∶1.83∶3.06∶4.56∶14.74, and the average molecular weight of SPA was around 0.76×104. By means of partial hydrolysis, Smith degradation, mathylation analysis, GC-MSIR and 13C NMR, the results revealed the main chain was made up of (1→6)-linked-Glc residues and substituted at 3-O. On an average, there was one branch among seven main chain residues. The side chains is composed of (1→4)-linked-Gal, (1→4)-linked-Man, (1→3)-linked-Gal and (1→2)-linked-Rha residues. The nonreduced end is composed of (1→)Ara.更多还原