title: Structural characterization and emulsifying properties of polysaccharides of Acacia mearnsii de Wild gum.
abstract: Polysaccharides (GNF) from Acacia mearnsii de Wild gum exudates, collected from trees growing in the south of Brazil, were characterized ((13)C and HSQC NMR, GC-MS, colorimetric assays). A commercial gum arabic (GAC) was analyzed similarly and compared with GNF. There were differences, consistent with distinct behavior in tensiometry tests and as emulsion stabilizer. GNF had a higher protein content than GAC, with small differences in the monosaccharide composition, the greater one being the lower uronic acid content of GNF (4%), compared with GAC (17%). GNF had a much broader molecular mass distribution, M(w)/M(n), and a lower M(w). GNF was more efficient in lowering the surface tension of water and saline solutions and was more efficient in emulsifying castor oil droplets. Results were discussed taking into account structural and molecular differences between the studied gums. It was concluded that polysaccharides from A. mearnsii de Wild are candidates as substitutes of currently commercialized arabic gums (Acacia senegal and Acacia seyal) having, depending on their application, improved properties.
authors.affiliation: BioPol, Departamento de Química, Universidade Federal do Paraná - UFPR, CxP 19081, CEP 81531-980, Curitiba, PR, Brazil.
authors.forename: Aline
authors.initials: A
authors.lastname: Grein
authors.forename: Bruno C
authors.initials: BC
authors.lastname: da Silva
authors.forename: Cinthia F
authors.initials: CF
authors.lastname: Wendel
authors.forename: Cesar A
authors.initials: CA
authors.lastname: Tischer
authors.forename: Maria Rita
authors.initials: MR
authors.lastname: Sierakowski
authors.forename: Angela B Dewes
authors.initials: AB
authors.lastname: Moura
authors.forename: Marcello
authors.initials: M
authors.lastname: Iacomini
authors.forename: Philip A J
authors.initials: PA
authors.lastname: Gorin
authors.forename: Fernanda F
authors.initials: FF
authors.lastname: Simas-Tosin
authors.forename: Izabel C
authors.initials: IC
authors.lastname: Riegel-Vidotti
mesh_terms: D000045:Acacia / Q000737:chemistry*; D001938:Brazil; D004655:Emulsions; D006170:Gum Arabic / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008970:Molecular Weight; D011134:Polysaccharides / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry
chemical_list: D004655:Emulsions; D011134:Polysaccharides; D012965:Sodium Chloride; D006170:Gum Arabic