title: Structural features of a polysaccharide from Astragalus membranaceus (Fisch.) Bge. var. mongholicus (Bge.) Hsiao.
abstract: A polysaccharide Astragalus polysaccharide (APS) was obtained from the boiling water extract of Astragalus membranaceus (Fisch.) Bge. var. mongholicus (Bge.) Hsiao. The results of gas chromatography (GC) indicated that APS consisted of l-rhamnose (l-Rha), d-xylose (d-Xyl), d-glucose (d-Glc), and d-galactose (d-Gal) in the molar ratio of 1:4:5:1.5. Its molecular weight was determined to be 3.01 × 10(5) by high-performance gel filtration chromatography. The results of (1)H NMR and (13)C NMR spectral analysis indicated that APS had a linear backbone mainly consisting of 1,3-linked β-d-Gal residues with insertion of β-Glc, 1,6-linked α-Gal, 1,5-linked β-Xyl, 1,4-linked β-Gal, β-d-Gal, 1,2-linked α-Rha, 1,2,4-linked α-Rha residues. HSQC spectrum indicated that C-2 and C-6 may link with H.
authors: Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, China.
authors: Juan
authors: J
authors: Fu
authors: Linfang
authors: L
authors: Huang
authors: Haitao
authors: H
authors: Zhang
authors: Shihai
authors: S
authors: Yang
authors: Shilin
authors: S
authors: Chen
mesh_terms: D027885:Astragalus propinquus / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000737:chemistry* / Q000302:isolation & purification*; D019906:Nuclear Magnetic Resonance, Biomolecular; D018517:Plant Roots / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D011134:Polysaccharides