The galactan sulfate from the edible,red alga Porphyra columbina |
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Authors: | Donald J. Brasch Hi Mui Chang Chaw T. Chuah Laurence D. Melton |
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Affiliation: | University of Otago, Dunedin New Zealand |
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Abstract: | A galactan sulfate has been isolated from the seaweed Porphyra columbina, and its structure established by a combination of methylation, methanolysis, treatment with alkali followed by methylation, and 13C-n.m.r. spectroscopy. The polysaccharide belongs to the porphyran class, and consists of 3-linked β-d-galactosyl residues and 4-linked α-l-galactosyl residues. 3,6-Anhydro-l-galactose and l-galactose 6-sulfate residues total approximately half of the sugar units, the other half being made up of d-galactose and 6-O-methyl-d-galactose residues. Some evidence is presented that suggests that the galactan sulfate does not have a completely alternating structure. |
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