title: [Structural features of a neutral heteropolysaccharide CPB-4 from Cynanchum paniculatum].
abstract: OBJECTIVE
  To study the chemical features of CPB-4, a heteropolysaccharide obtained from Cynanchum paniculatum.
  
  
  METHODS
  Sugar composition analysis, methylation analysis, partial hydrolysis and carbon-13 nuclear magnetic resonance were used to determine the sugar composition, linkages, main chain, branch chains and branching points.
  
  
  RESULTS
  CPB-4 is composed of L-arabinose, L-xylose, L-rhamnose and D-galactose in closely molar ratios of 0.8:0.2:0.2:1.0. Its main chain is comprised of 1, 5 linked galactose and side chains are comprised of terminal xylose, terminal arabinose, oligosaccharide of arabinose and oligosaccharide of arabinose, rhamnose and galactose. The branching points are located at C-6 and C-2 of galactose.
  
  
  CONCLUSIONS
  CPB-4 is a new heteropolysaccharide from C. paniculatum.
authors.affiliation: Shanghai Institute of Materia Medica, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
authors.forename: Shun-chun
authors.initials: SC
authors.lastname: Wang
authors.forename: Xing-feng
authors.initials: XF
authors.lastname: Bao
authors.forename: Ji-nian
authors.initials: JN
authors.lastname: Fang
mesh_terms: D001089:Arabinose / Q000302:isolation & purification; D031105:Cynanchum / Q000737:chemistry*; D008745:Methylation; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D012210:Rhamnose / Q000302:isolation & purification; D014994:Xylose / Q000302:isolation & purification
chemical_list: D011134:Polysaccharides; D014994:Xylose; D001089:Arabinose; D012210:Rhamnose