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Enzymatic treatment of wheat arabinoxylan with α-arabinofuranosidases enhances graft yield and modifies viscoelastic properties. This creates promising biobased cellulose coatings with improved water sorption and adsorption characteristics.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Arabinoxylans are plant polysaccharides with potential applications in biomaterials.
  • Enzymatic modification can alter polysaccharide structure and properties.
  • Grafting introduces new functionalities to polymer backbones.

Purpose of the Study:

  • To investigate the effect of α-arabinofuranosidases on wheat arabinoxylan structure.
  • To evaluate the graft yield and cellulose adsorption of modified xylans.
  • To assess the viscoelastic properties and water sorption of grafted xylans for biobased coatings.

Main Methods:

  • Wheat arabinoxylan was treated with two α-arabinofuranosidases to create distinct substrates.
  • Substrates were characterized by their arabinose substitution patterns on the xylopyranose backbone.
  • Xylan preparations were grafted with glycidyl methacrylate and analyzed for graft yield and cellulose adsorption.
  • Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) was used to evaluate viscoelastic properties.

Main Results:

  • The highest graft yield was achieved with xylan preparations featuring a largely unsubstituted xylopyranose backbone.
  • Grafted xylans showed a two-stage desorption pattern via QCM-D, indicating altered water sorption.
  • Adsorption to cellulose surfaces was influenced by the grafting process.

Conclusions:

  • α-Arabinofuranosidases can be used to tailor arabinoxylan structure for improved grafting efficiency.
  • Grafted xylans exhibit modified viscoelastic properties and enhanced water sorption.
  • These modified xylans show potential as effective biobased cellulose coatings.