I. J. Miller
Evaluation of the Structures of Polysaccharides from Two New Zealand Members of the Ceramiaceae
The structures of the polysaccharides extracted from Griffithsia antarctica and Ceramium uncinatum, both from the family Ceramiaceae (order Ceramiales) were evaluated. Both were based on the agar structure with a high level of precursors. The polysaccharide from Griffithsia antarctica was almost completely sulfated at the 4-position, with approximately half the 4-linked units either anhydrogalactose or its precursor (in about equal amounts comparing the sugar analysis with the linkage analysis), and the other half sulfated at the 3-position and, additionally, with 2-xylosyl, 2-sulfate or 6-sulfate ester as substituents. The polysaccharide from Ceramium uncinatum was somewhat different in nature. One in four of the 3-linked units was sulfated at the 6-position, while half of the 4-linked units were in the anhydrogalactosyl form, with approximately equal amounts of galactose, galactose 6-sulfate (anhydrogalactose precursor) and galactose substituted with xylose making up the remaining 4-linked units. Both polysaccharides showed low levels of 6-O-methylgalactose and 2-O-methyl-3,6-anhydrogalactose.
Botanica Marina, Walter de Gruyter
Print ISSN: 0006-8055
Volume: 46, 07/2003
Pages: 378 - 385
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