title: Galactomannans with novel structures from the lichen Roccella decipiens Darb.
abstract: Two homogeneous galactomannan fractions were isolated from the lichen, Roccella decipiens, one (FP) containing Man and Gal in an 81:19 molar ratio and the other (RFS), having Man, Gal, and Glc in a 43:56:1 molar ratio. FP consisted of a main chain with (1-->4)-linked alpha-D-Manp units, most of which were substituted at O-2 with side chains consisting of nonreducing end-, 2-O- and 6-O-substituted alpha-Manp units. The latter appeared to be substituted by single-unit beta-D-Galf nonreducing ends. RFS contained a similar alpha-D-Manp core structure, but with side chains containing nonreducing end, 5-O-, 6-O-, and 5,6-di-O-substituted beta-D-Galf units. Such polysaccharide structures have not been previously reported.
authors.affiliation: Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, UFPR, CP 19.046, CEP 81.531-990 Curitiba, PR, Brazil.
authors.forename: Elaine R
authors.initials: ER
authors.lastname: Carbonero
authors.forename: Lucimara M C
authors.initials: LM
authors.lastname: Cordeiro
authors.forename: Caroline G
authors.initials: CG
authors.lastname: Mellinger
authors.forename: Guilherme L
authors.initials: GL
authors.lastname: Sassaki
authors.forename: Elfriede
authors.initials: E
authors.lastname: Stocker-Wörgötter
authors.forename: Philip A
authors.initials: PA
authors.lastname: J Gorin
authors.forename: Marcello
authors.initials: M
authors.lastname: Iacomini
mesh_terms: D000085:Acetates / Q000737:chemistry; D005690:Galactose / Q000031:analogs & derivatives; D008011:Lichens / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008351:Mannans / Q000737:chemistry* / Q000302:isolation & purification; D008745:Methylation; D009005:Monosaccharides / Q000737:chemistry; D013402:Sugar Alcohols / Q000737:chemistry
chemical_list: D000085:Acetates; D008351:Mannans; D009005:Monosaccharides; D013402:Sugar Alcohols; C012990:galactomannan; D005690:Galactose