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Advisor(s)
Abstract(s)
This study was developed with the purpose to investigate the effect of polysaccharide/plasticiser concentration
on the microstructure and molecular dynamics of polymeric film systems, using transmission
electron microscope imaging (TEM) and nuclear magnetic resonance (NMR) techniques. Experiments
were carried out in chitosan/glycerol films prepared with solutions of different composition. The films
obtained after drying and equilibration were characterised in terms of composition, thickness and water activity.
Results show that glycerol quantities used in film forming solutions were responsible for films composition;
while polymer/total plasticiser ratio in the solution determined the thickness (and thus structure)
of the films. These results were confirmed by TEM.
NMR allowed understanding the films molecular rearrangement. Two different behaviours for the two
components analysed, water and glycerol were observed: the first is predominantly moving free in the
matrix, while glycerol is mainly bounded to the chitosan chain.
Description
Keywords
Edible films Microstructure NMR Molecular dynamics Structure–function Water behaviour
Citation
FUNDO, Joana …[et al.] - Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films. Food Chemistry. ISSN 0308-8146 Vol. 144 (2014), p. 2-8
Publisher
Elsevier