title: Structural investigation of the capsular polysaccharide from Klebsiella K19 by chemical and N.M.R. analyses.
abstract: Sugar analysis of the capsular antigen K19 from Klebsiella and of the carboxyl-reduced derivative confirmed its classification into the chemotype containing rhamnose, galactose, glucose, and glucuronic acid residues. Partial acid hydrolysis and phage depolymerization of K19 provided respectively a modified, linear form of the polysaccharide and oligosaccharides of the repeating unit, these were used for the structural elucidation of the original polymer. Methylation analysis, Smith degradation, and 1H- and 13C-n.m.r. spectroscopy of the polysaccharide and derivatives permitted formulation of the following structure for K19: (formula; see text)
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D007709:Klebsiella / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D010084:Oxidation-Reduction; D011135:Polysaccharides, Bacterial / Q000302:isolation & purification*
chemical_list: D011135:Polysaccharides, Bacterial