Computer Science
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1185s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 5, pp.1185-1193
Computer Science
Scientific paper
Isolation and chemical elucidation of dissolved and particulate polysaccharides in seawater were conducted. The water samples were collected in Mikawa Bay, Japan during a red tide bloom of the dinoflagellate, Prorocentrum minimum . Dissolved polysaccharides were concentrated from 5-101 of seawater with dialysis followed by separation by gel flitration, and isolation by ethanol precipitation. A heteropolysaccharide consisting of glucose, galactose, mannose, xylose, arabinose, fucose and rhamnose and a glucan were isolated from the polysaccharide component having a molecular weight more than 4,000 Dalton and were characterized by several chemical analyses. The heteropolysaccharide is a mucilaginous polysaccharide having a highly branched structure and a molecular weight of 10 4 -5 × 10 6 Daltons and probably contains a sulfate half ester: the glucan is a polysaccharide with -1,3- and 1,6-linkages (chrysolaminaran type). Concentrations of these were respectively ca . 20 and 67 g l -1 at 1 m, and 2 and 26 g l -1 at 6 m. A similar heteropolysaccharide was found in the boiling water extract of the particulate matter, while -glucan was isolated in a much less purified form than the seawater -glucan. In addition, a large amount of -1,4 glucan was found in the strong alkali extract of the particulate matter, indicating that this glucan must be a cell wall polysaccharide derived from phytoplankton. These results strongly suggest that the heteropolysaccharide and chrysolaminaran type polysaccharide dissolved in seawater were derived from water soluble carbohydrates of phytoplankton through extracellular release or cell lysis.
Handa Nobuhiko
Sakugawa Hiroshi
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