title: Room temperature, low-field 13C-n.m.r. spectra of degraded carrageenans. Part II. On the specificity of the autohydrolysis reaction in kappa/iota and mu/nu structures.
abstract: A kappa/iota carrageenan from Gigartina skottsbergii and a partially cyclized mu/nu carrageenan from Iridaea undulosa were submitted to autohydrolysis. The 13C-n.m.r. spectra of the degraded products give structural information on the polysaccharides and show clearly that besides the known splitting of 3,6-anhydrogalactosidic linkages, the linkage between alpha-D-galactose 2,6-disulphate and beta-D-galactose 4-sulphate is cleaved with similar specific reaction rate.
authors.affiliation: Departmento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
authors.forename: M
authors.initials: M
authors.lastname: Ciancia
authors.forename: M C
authors.initials: MC
authors.lastname: Matulewicz
authors.forename: C A
authors.initials: CA
authors.lastname: Stortz
authors.forename: A S
authors.initials: AS
authors.lastname: Cerezo
mesh_terms: D002240:Carbohydrate Sequence; D002351:Carrageenan / Q000737:chemistry*; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D013696:Temperature
chemical_list: D002351:Carrageenan