title: Structure of a sulfated xylofucan from the brown alga Punctaria plantaginea.
abstract: A polysaccharide composed of L-fucose, D-xylose, and sulfate in a molar proportion of about 5:2:3 was isolated from the brown alga Punctaria plantaginea. Polysaccharide structure was elucidated by methylation analysis, Smith degradation, as well as by 1D and 2D NMR spectroscopy. The polysaccharide was shown to contain a backbone of 3-linked α-L-fucopyranose residues, about two thirds of which are sulfated at O-2 forming trisaccharide repeating units →3)-α-L-Fucp2S-(1→3)-α-L-Fucp2S-(1→3)-α-L-Fucp-(1→. This structural regularity is masked by random distribution of non-sulfated β-D-Xylp residues attached to position 4 of the backbone. The polysaccharide is a new representative of a complex 'fucoidan' family of sulfated polysaccharides of brown seaweeds.
authors.affiliation: N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii prosp., 47, 119991 Moscow, Russian Federation.
authors.forename: Maria I
authors.initials: MI
authors.lastname: Bilan
authors.affiliation: N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii prosp., 47, 119991 Moscow, Russian Federation.
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shashkov
authors.affiliation: N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii prosp., 47, 119991 Moscow, Russian Federation. Electronic address: usov@ioc.ac.ru.
authors.forename: Anatolii I
authors.initials: AI
authors.lastname: Usov
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D000459:Phaeophyceae / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D013431:Sulfates / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D011134:Polysaccharides; D013431:Sulfates
keywords: Brown algae; Fucoidan; NMR spectroscopy; Punctaria plantaginea; Sulfated xylofucan