title: Carrageenan from the tetrasporic stage of Gigartina decipiens (Gigartinaceae, Rhodophyta).
abstract: The structure of the polysaccharide isolated from tetrasporophytic plants of the New Zealand red alga Gigartina decipiens has been determined by chemical and spectroscopic techniques. It is a linear polymer composed primarily of alternating 3-linked beta-D-galactopyranosyl 2-sulphate and 4-linked alpha-D-galactopyranosyl 2,6-disulphate residues. About 15% of the 3-linked residues have an additional sulphate ester group at the 6-position. Aside from this small extra sulphate substitution, the structure is that of the idealised lambda-carrageenan. Good quality solution-state 13C NMR spectra were recorded and interpreted for this carrageenan and for the carrageenans produced from it by solvolytic desulphation and alkali modification.
authors.affiliation: Industrial Research Limited, Lower Hutt, New Zealand.
authors.forename: R
authors.initials: R
authors.lastname: Falshaw
authors.forename: R H
authors.initials: RH
authors.lastname: Furneaux
mesh_terms: D002240:Carbohydrate Sequence; D002247:Carbon Isotopes; D002351:Carrageenan / Q000737:chemistry*; D004171:Diploidy; D005685:Galactans / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008969:Molecular Sequence Data; D009005:Monosaccharides / Q000032:analysis; D000461:Rhodophyta / Q000737:chemistry* / Q000254:growth & development; D013464:Sulfuric Acids / Q000032:analysis
chemical_list: D002247:Carbon Isotopes; D005685:Galactans; D009005:Monosaccharides; D013464:Sulfuric Acids; D002351:Carrageenan