title: Structure of the capsular polysaccharide from Streptococcus pneumoniae type 23.
abstract: The capsular polysaccharide from Streptococcus pneumoniae Type 23 (S-23) was found to contain D-galactose, D-glucose, L-rhamnose, glycerol, and phosphorus in the ratios of 1:1:2:0.6:1. Methylation analysis provided information about the linkages of the different sugar units. The sequence of the different sugar residues was confirmed by Smith degradation. Oxidation of S-23 with chromium trioxide indicated that all of the sugar units have the beta configuration. The results suggest the following structure for the repeating unit. (formula; see text)
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D008745:Methylation; D009904:Optical Rotation; D010084:Oxidation-Reduction; D011135:Polysaccharides, Bacterial / Q000302:isolation & purification*; D013296:Streptococcus pneumoniae / Q000276:immunology*
chemical_list: D011135:Polysaccharides, Bacterial