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Multiscale characterization of arabinoxylan and β-glucan composite films
- Source :
- Carbohydrate Polymers, Carbohydrate Polymers, Elsevier, 2015, 122, pp.248-254. ⟨10.1016/j.carbpol.2015.01.014⟩
- Publication Year :
- 2014
-
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.
- Subjects :
- Materials science
Magnetic Resonance Spectroscopy
beta-Glucans
Polymers and Plastics
[SDV]Life Sciences [q-bio]
Composite number
Composite film
Polysaccharide
Nanocomposites
Cell wall
chemistry.chemical_compound
Cell Wall
Specific surface area
Arabinoxylan
Materials Chemistry
Organic chemistry
Spectroscopy
Triticum
Glucan
chemistry.chemical_classification
Arabinoxylans
Organic Chemistry
Water
Relaxation time
Polymer
chemistry
Chemical engineering
Xylans
Proton mobility
Low-field NMR
Subjects
Details
- ISSN :
- 18791344 and 01448617
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Carbohydrate polymers
- Accession number :
- edsair.doi.dedup.....0f974c50089da595c7691d22796c5e30
- Full Text :
- https://doi.org/10.1016/j.carbpol.2015.01.014⟩