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 α- d-galactose 2,6-disulphate and β- d-galactose 4-sulphate is cleaved with similar specific reaction rate.
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