6533b837fe1ef96bd12a3268

RESEARCH PRODUCT

Water-induced local ordering of chitosan polymer chains in thin layer films

Thomas KarbowiakRégis D. GougeonJésus RayaPhilippe R. BodartClaire Madeleine-perdrillatFrédéric Debeaufort

subject

chemistry.chemical_classificationChitosanMagnetic Resonance SpectroscopyPolymers and PlasticsPolymersOrganic ChemistryActive packagingBiomaterialWaterStructureGlycosidic bondPolymerControlled releaseNMRChitosanAcetic acidchemistry.chemical_compoundchemistryPolymer chemistryMaterials Chemistry[SDV.BBM]Life Sciences [q-bio]/Biochemistry Molecular BiologyMultiplicity (chemistry)Polymer[SDV.AEN]Life Sciences [q-bio]/Food and Nutrition

description

International audience; Carbon-13 NMR (CP-MAS and FSLG 1H–13C HETCOR) have been applied to chitosan salt films synthesized in acetic acid and exposed to different relative humidity environments (32% or 75%) at 20 °C for 1 month. It gives insight in the relationship between structure and functional properties according to the hydration level of this biomaterial as a film. The acetate ions trapped in the chitosan act as structuring agents between chitosan chains for the low hydration state. But, increasing the moisture content induces spontaneous removal of acetic acid and a subsequent modification in the film structure, with an increase in local ordering. HETCOR experiments also showed a multiplicity of signals for most of the observed carbon atoms and in particular those implied in the glycosidic linkage, which reveals different water-induced conformational states. Changing the water content allows to modify the polymer structure and therefore to modulate the properties such as controlled release of active compounds trapped in chitosan-based coatings, e.g., for medicated dressing or active packaging.

10.1016/j.carbpol.2014.11.001https://hal-agrosup-dijon.archives-ouvertes.fr/hal-02510661