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  • Title: A sulfated glucuronofucan containing both fucofuranose and fucopyranose residues from the brown alga Chordaria flagelliformis.
    Author: Bilan MI, Vinogradova EV, Tsvetkova EA, Grachev AA, Shashkov AS, Nifantiev NE, Usov AI.
    Journal: Carbohydr Res; 2008 Oct 13; 343(15):2605-12. PubMed ID: 18619579.
    Abstract:
    A fucoidan fraction composed of l-fucose, sulfate, and d-glucuronic acid in a molar proportion of about 1:1:0.25 and small amount of acetyl groups was isolated from the brown alga Chordaria flagelliformis. Several modified polysaccharides were prepared from the native fucoidan using solvolytic desulfation, carboxyl reduction, and partial acid hydrolysis. Polysaccharide structures were elucidated by methylation analysis and 1D and 2D NMR spectroscopy. The fucoidan was shown to contain a backbone of 3-linked alpha-l-fucopyranose residues, about one-third of which are glycosylated at C-2 by alpha-d-glucopyranosyluronic acid residues. About half of the latter residues are glycosylated at C-4 by single alpha-L-fucofuranose residues or by disaccharides alpha-L-Fucf-(1-->2)-alpha-L-Fucf-(1-->. Fucofuranose residues are mono- and disulfated at different positions, whereas some additional sulfate groups occupy C-2 and C-4 of the backbone, the latter position being also partially acetylated.
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