title: Nanometric organisation in blends of gellan/xyloglucan hydrogels.
abstract: Mixtures of gellan gum (GL) and a xyloglucan (XGJ) extracted from Hymenaea courbaril seeds were prepared in a solution of 0.15 mol L(-1) NaCl. Rheology measurements revealed that 2.4 g L(-1) pure GL formed a brittle hydrogel, and GL-XGJ blends showed improved pseudoplastic character with higher XGJ contents. SAXS analyses showed that the Rg dimensions ranged from 1.3 to 4.9 nm, with larger values occurring as the amount of XGJ increased, and diffusion tests indicated that better diffusion of methylene blue dye was obtained in the network with a higher XGJ content. AFM topographic images of the films deposited onto mica revealed fewer heterogeneous surfaces with increased XGJ contents. The water contact angle revealed more hydrophobic character on all of the films, and the wettability decreased with increasing amounts of XGJ. Therefore, the demonstrated benefit of using XGJ blends is the production of a soft material with improved interface properties.
authors.affiliation: Laboratório de Biopolímeros-BioPol, Departamento de Química, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil; Curso de Licenciatura em Química, Escola de Educação e Humanidades, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba 80215-901, PR, Brazil.
authors.forename: Clayton F
authors.initials: CF
authors.lastname: de Souza
authors.affiliation: Laboratório de Biopolímeros-BioPol, Departamento de Química, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil.
authors.forename: Izabel C
authors.initials: IC
authors.lastname: Riegel-Vidotti
authors.affiliation: Laboratório Nacional de Luz Síncrotron (LNLS), PO 6192, Campinas 13083-970, SP, Brazil.
authors.forename: Mateus B
authors.initials: MB
authors.lastname: Cardoso
authors.affiliation: Laboratório de Microbiologia Prof. Yasuyoshi Hayashi, Departamento de Patologia Básica, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil.
authors.forename: Lucy
authors.initials: L
authors.lastname: Ono
authors.affiliation: Laboratório de Biopolímeros-BioPol, Departamento de Química, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil; Curso de Licenciatura em Química, Escola de Educação e Humanidades, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba 80215-901, PR, Brazil.
authors.forename: Neoli
authors.initials: N
authors.lastname: Lucyszyn
authors.affiliation: Laboratório de Biopolímeros-BioPol, Departamento de Química, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil.
authors.forename: Adriana F
authors.initials: AF
authors.lastname: Lubambo
authors.affiliation: Laboratório de Biopolímeros-BioPol, Departamento de Química, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil.
authors.forename: Camila V
authors.initials: CV
authors.lastname: Sens
authors.affiliation: Laboratório de Biopolímeros-BioPol, Departamento de Química, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil.
authors.forename: Aline
authors.initials: A
authors.lastname: Grein-Iankovski
authors.affiliation: Laboratório de Biopolímeros-BioPol, Departamento de Química, Universidade Federal do Paraná (UFPR), PO 19081, Curitiba 81531-990, PR, Brazil. Electronic address: mariarita.sierakowski@ufpr.br.
authors.forename: Maria Rita
authors.initials: MR
authors.lastname: Sierakowski
mesh_terms: D005936:Glucans / Q000737:chemistry / Q000302:isolation & purification*; D020100:Hydrogels / Q000737:chemistry / Q000302:isolation & purification*; D052597:Hymenaea; D036103:Nanotechnology / Q000379:methods*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D011135:Polysaccharides, Bacterial / Q000737:chemistry / Q000302:isolation & purification*; D014961:X-Ray Diffraction; D014990:Xylans / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D005936:Glucans; D020100:Hydrogels; D010936:Plant Extracts; D011135:Polysaccharides, Bacterial; D014990:Xylans; C029353:xyloglucan; C048288:gellan gum
keywords: Contact angle; Gellan gum; Hydrocolloid films; Hydrogel; SAXS; Xyloglucan