title: Structural investigation of a heteroglycan isolated from the fruit bodies of an ectomycorrhizal fungus Astraeus hygrometricus.
abstract: A polysaccharide fraction (AQS-II) has been isolated from the hot aqueous extract of the fruits of an ectomycorrhizal fungus Astraeus hygrometricus. It was found to contain 63% polysaccharide and 35% protein. The polysaccharide part contains glucose, galactose, and fucose in a 2:1:1 molar ratio. On the basis of total acid hydrolysis, methylation analysis, periodate oxidation, and NMR studies ((1)H, (13)C, DQF-COSY, TOCSY, NOESY, HMBC, and HSQC) the structure of the repeating unit of the polysaccharide was established as [structure: see text].
authors.affiliation: Department of Chemistry and Chemical Technology, Vidyasagar University, West Midnapore 721 102, West Bengal, India.
authors.forename: Indranil
authors.initials: I
authors.lastname: Chakraborty
authors.forename: Soumitra
authors.initials: S
authors.lastname: Mondal
authors.forename: Dilip
authors.initials: D
authors.lastname: Rout
authors.forename: Krishnendu
authors.initials: K
authors.lastname: Chandra
authors.forename: Syed S
authors.initials: SS
authors.lastname: Islam
mesh_terms: D000363:Agaricales / Q000737:chemistry*; D002240:Carbohydrate Sequence; D048690:Fruiting Bodies, Fungal / Q000737:chemistry*; D005643:Fucose / Q000737:chemistry; D005690:Galactose / Q000737:chemistry; D005947:Glucose / Q000737:chemistry; D006868:Hydrolysis; D008745:Methylation; D019906:Nuclear Magnetic Resonance, Biomolecular; D010084:Oxidation-Reduction; D010504:Periodic Acid / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D011134:Polysaccharides; D014867:Water; D010504:Periodic Acid; D005643:Fucose; D005947:Glucose; D005690:Galactose