A sustainable approach to synchronous improvement of wet-stability and toughness of chitosan films

Bingnan Mu, Qianmei Wu, Lan Xu, Yiqi Yang

Research output: Contribution to journalArticlepeer-review

Abstract

Wet-stability and toughness of chitosan films were improved synchronously via the establishment of formyl-saccharide intermolecular bonds. Poor wet stability and inferior mechanical properties limit the large-scale application of chitosan films. Previous crosslinkings using saccharide-aldehydes caused concerns such as formaldehyde, weakened mechanical properties, and changed cytocompatibility. Here we developed formaldehyde-free formyl-saccharides via control of oxidation conditions. Mechanical properties of chitosan products could be improved using different structures of formyl-saccharides with minimal amounts. With only 0.5% of sucrose-aldehydes(SU3) and raffinose-aldehydes(RA4), breaking strength and strain of chitosan films increased from 28 to 38 MPa and from 19% to 48%, respectively. Further increase in concentrations of crosslinkers contributed to more improvement of properties of chitosan films. Chitosan films with 2% of sucrose-aldehydes (SU3) had an increase in wet strength from 0 to 14 MPa and almost 100% weight retention in acidic water. Crosslinkages of formyl-saccharides did not change cytocompatibility and color of films.

Original languageEnglish (US)
Article number107138
JournalFood Hydrocolloids
Volume123
DOIs
StatePublished - Feb 2022

Keywords

  • Chitosan
  • Ductility
  • Films
  • Formyl-saccharides
  • Wet stability

ASJC Scopus subject areas

  • Food Science
  • Chemistry(all)
  • Chemical Engineering(all)

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