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.
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.
Ciancia
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Departmento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
Matulewicz
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MC
Stortz
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CA
Cerezo
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AS
D002240:Carbohydrate Sequence; D002351:Carrageenan / Q000737:chemistry*; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D013696:Temperature
D002351:Carrageenan