Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/27506

TitleMolecular mobility, composition and structure analysis in glycerol plasticised chitosan films
Author(s)Fundo, J. F.
Fernandes, Rui
Almeida, Pedro M.
Carvalho, Alexandra
Feio, Gabriel
Silva, Cristina L. M.
Quintas, Mafalda A. C.
KeywordsEdible films
Microstructure
NMR
Molecular dynamics
Structure–function
Water behaviour
Issue date2014
PublisherElsevier
JournalFood Chemistry
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.
TypeArticle
URIhttp://hdl.handle.net/1822/27506
DOI10.1016/j.foodchem.2013.05.127
ISSN0308-8146
e-ISSN0308-8146
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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