title: A highly regular fraction of a fucoidan from the brown seaweed Fucus distichus L.
abstract: A fucoidan fraction consisting of L-fucose, sulfate, and acetate in a molar proportion of 1:1.21:0.08 was isolated from the brown seaweed Fucus distichus collected from the Barents Sea. The 13C NMR spectrum of the fraction was typical of regular polysaccharides containing disaccharide repeating units. According to 1D and 2D 1H and 13C NMR spectra, the fucoidan molecules are built up of alternating 3-linked alpha-L-fucopyranose 2,4-disulfate and 4-linked alpha-L-fucopyranose 2-sulfate residues: -->3)-alpha-L-Fucp-(2,4-di-SO3-)-(1-->4)-alpha-L-Fucp-(2SO3-)-(1-->. The regular structure may be only slightly masked by random acetylation and undersulfation of several disaccharide repeating units.
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.forename: Alexey A
authors.initials: AA
authors.lastname: Grachev
authors.forename: Nadezhda E
authors.initials: NE
authors.lastname: Ustuzhanina
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shashkov
authors.forename: Nikolay E
authors.initials: NE
authors.lastname: Nifantiev
authors.forename: Anatolii I
authors.initials: AI
authors.lastname: Usov
mesh_terms: D007259:Infrared Rays; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D000459:Phaeophyceae / Q000737:chemistry*; D011134:Polysaccharides / Q000032:analysis* / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D011134:Polysaccharides; C007789:fucoidan