title: Pectic type II arabinogalactans from starfruit (Averrhoa carambola L.).
abstract: A structural characterization of polysaccharides from edible tropical fruit named starfruit (Averrhoa carambola L.) was carried out. After the purification steps, two homogeneous fractions were obtained. Fraction 50R was composed of rhamnose, arabinose, galactose and uronic acid in 4.3:56.2:37.4:2M ratio, respectively and fraction 10R was composed of rhamnose, arabinose, galactose and uronic acid in 2.8:65.8:28.5:3M ratio, respectively. Methylation and NMR spectroscopy analyses showed that these fractions are formed by pectic arabinogalactans, which contain (1→3), (1→6) and (1→3,6)-linked Galp units. The side chains have 3-O-, 5-O- and 3,5-di-O-linked α-Araf and nonreducing end-units of α-Araf, Arap, β-Galp and α-GlcpA. These arabinogalactans were linked to type I rhamnogalacturonans.
authors.affiliation: Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, CP 19.046, CEP 81.531-980, Curitiba, PR, Brazil.
authors.forename: Carolina Lopes
authors.initials: CL
authors.lastname: Leivas
authors.affiliation: Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, CP 19.046, CEP 81.531-980, Curitiba, PR, Brazil.
authors.forename: Marcello
authors.initials: M
authors.lastname: Iacomini
authors.affiliation: Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, CP 19.046, CEP 81.531-980, Curitiba, PR, Brazil. Electronic address: lucimaramcc@ufpr.br.
authors.forename: Lucimara M C
authors.initials: LM
authors.lastname: Cordeiro
mesh_terms: D001089:Arabinose / Q000032:analysis; D065826:Averrhoa / Q000737:chemistry*; D005638:Fruit / Q000737:chemistry*; D005685:Galactans / Q000737:chemistry*; D005690:Galactose / Q000032:analysis; D010368:Pectins / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D012210:Rhamnose / Q000032:analysis; D014574:Uronic Acids / Q000032:analysis
chemical_list: D005685:Galactans; D011134:Polysaccharides; D014574:Uronic Acids; D010368:Pectins; D001089:Arabinose; D012210:Rhamnose; D005690:Galactose
keywords: Averrhoa carambola; Pectic type II arabinogalactans; Starfruit