title: Identification by NMR spectroscopy of oligosaccharides obtained by acidolysis of the capsular polysaccharides of a thermal biomass.
abstract: This study deals with the chemical characterization of a capsular polysaccharide (CPS) produced by a thermal biomass largely comprising the cyanobacterium Mastigocladus laminosus. The sugar moiety of this polymer is composed of seven neutral monosaccharides (Rha, Fuc, Ara, Xyl, Man, Glc, Gal) and two uronic acids (GalA, GlcA). Proteins represent 18% of the dry weight of the CPS. Organic acid substituents (acetate, pyruvate, succinate) were also detected and estimated by high-performance liquid chromatography. The presence of sulfate groups (5% w/w) was observed, which represents a relatively rare feature for cyanobacteria. Acidic hydrolysis of the purified polysaccharide led to the isolation of four oligosaccharidic fractions. NMR spectroscopy studies of two of the four purified oligosaccharides allowed them to be identified as: alpha-GlcA-(1-->2)-alpha-GalA-(1-->2)-Man and alpha-GlcA-(1-->2)-alpha-GalA-(1-->2)-beta-Man-(1-->4)-beta-Gal-(1 -->2)-Rha.
authors.affiliation: Laboratoire de Biologie Cellulaire Végétale et Valorisation des Espèces Ligneuses, Université de Limoges, France.
authors.forename: V
authors.initials: V
authors.lastname: Gloaguen
authors.forename: J M
authors.initials: JM
authors.lastname: Wieruszeski
authors.forename: G
authors.initials: G
authors.lastname: Strecker
authors.forename: L
authors.initials: L
authors.lastname: Hoffmann
authors.forename: H
authors.initials: H
authors.lastname: Morvan
mesh_terms: D016667:Bacterial Capsules / Q000737:chemistry*; D018533:Biomass; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid; D000458:Cyanobacteria / Q000737:chemistry*; D005618:Fresh Water / Q000382:microbiology; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000032:analysis*; D011135:Polysaccharides, Bacterial / Q000737:chemistry*
chemical_list: D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial