Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4985
Título: Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films
Autor: Fundo, Joana F.
Fernandes, Rui
Almeida, Pedro L.
Carvalho, Alexandra
Feio, Gabriel
Silva, Cristina L. M.
Quintas, Mafalda A. C.
Palavras-chave: Edible films
Molecular dynamics
Structure function
Water behaviour
Data: 1-Fev-2014
Editora: Elsevier Science LTD
Citação: FUNDO, Joana; [et al] – Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films. Food Chemistry. ISSN: 0308-8146. Vol. 144 (2014), pp. 2-8
Resumo: 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. (C) 2013 Elsevier Ltd. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4985
DOI: 10.1016/j.foodchem.2013.05.127
ISSN: 0308-8146
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0308814613007334#
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