title: Multiscale characterization of arabinoxylan and β-glucan composite films.
abstract: Composite films made with Arabinoxylans (AXs) (with high, middle and low level of substitution by arabinose) and (1 → 3)(1 → 4)-β-D-glucans (BGs) extracted from cereal cell walls have been prepared and analyzed using microscopy (SEM and LSCFM), DSC, mechanical tests and TD-NMR spectroscopy. The objectives were to correlate molecular and physico-chemical properties of films with mechanical and hydration properties of wheat cell walls. A phase separation phenomenon was observed for films made with highly substituted AXs and BGs at a ratio AX/BG of 60/40. This phase separation was correlated with lower dipolar interactions between polysaccharide chains and a decrease of ultimate strain and stress of films. Highly substituted AX and BG composite films exhibited very weak mechanical properties in agreement with weaker interactions between the polymer chains. This effect was supported by NMR results showing that interactions between AXs and BGs decreased with increased substitution of AXs in composite films. Lower dipolar interactions between polysaccharides favored the water mobility in relation with a higher specific surface area of polysaccharides in films but also higher distances between polysaccharide chains so larger nanopores in composite films made within highly substituted AXs. These multiscale characterizations agreed with the structural changes observed in wheat grain during its development.
authors.affiliation: College of Light Industry of Science and Engineering, Nanjing Forest University, Nanjing 210037, PR China; UR1268 Biopolymères, Interactions, Assemblages, INRA, F-44316 Nantes, France.
authors.forename: Ruifeng
authors.initials: R
authors.lastname: Ying
authors.affiliation: UR1268 Biopolymères, Interactions, Assemblages, INRA, F-44316 Nantes, France.
authors.forename: Luc
authors.initials: L
authors.lastname: Saulnier
authors.affiliation: UR1268 Biopolymères, Interactions, Assemblages, INRA, F-44316 Nantes, France.
authors.forename: Brigitte
authors.initials: B
authors.lastname: Bouchet
authors.affiliation: Unité mixte de Recherches Ingénierie des Agropolymères et Technologies Emergentes, INRA-ENSAM-UMII-CIRAD, 2 place Viala, 34060 Montpellier, France.
authors.forename: Cécile
authors.initials: C
authors.lastname: Barron
authors.affiliation: College of Light Industry of Science and Engineering, Nanjing Forest University, Nanjing 210037, PR China.
authors.forename: Sujie
authors.initials: S
authors.lastname: Ji
authors.affiliation: UR1268 Biopolymères, Interactions, Assemblages, INRA, F-44316 Nantes, France; Irstea, UR TERE, 17 avenue de Cucillé, CS 64427, F-35044 Rennes, France. Electronic address: corinne.rondeau@irstea.fr.
authors.forename: Corinne
authors.initials: C
authors.lastname: Rondeau-Mouro
mesh_terms: D002473:Cell Wall / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D053761:Nanocomposites / Q000737:chemistry*; D014908:Triticum / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014990:Xylans / Q000737:chemistry*; D047071:beta-Glucans / Q000737:chemistry*
chemical_list: D014990:Xylans; D047071:beta-Glucans; D014867:Water; C085118:arabinoxylan
keywords: Arabinoxylans; Composite film; Low-field NMR; Proton mobility; Relaxation time; β-Glucans