Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films

Joana F. Fundo; Rui Fernandes; Pedro M. Almeida; Alexandra Carvalho; Gabriel Feio; Cristina L.M. Silva; Mafalda A.C. Quintas

doi:10.1016/j.foodchem.2013.05.127

Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films

Joana F. Fundo, Rui Fernandes, Pedro M. Almeida, Alexandra Carvalho, Gabriel Feio, Cristina L.M. Silva^*, Mafalda A.C. Quintas

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

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.

Original language	English
Pages (from-to)	2-8
Number of pages	7
Journal	Food Chemistry
Volume	144
DOIs	https://doi.org/10.1016/j.foodchem.2013.05.127
Publication status	Published - 1 Jan 2014

Keywords

Edible films
Microstructure
Molecular dynamics
NMR
Structure-function
Water behaviour

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10.1016/j.foodchem.2013.05.127

http://hdl.handle.net/10400.14/14209

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title = "Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films",

abstract = "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.",

keywords = "Edible films, Microstructure, Molecular dynamics, NMR, Structure-function, Water behaviour",

author = "Fundo, {Joana F.} and Rui Fernandes and Almeida, {Pedro M.} and Alexandra Carvalho and Gabriel Feio and Silva, {Cristina L.M.} and Quintas, {Mafalda A.C.}",

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T1 - Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films

AU - Fundo, Joana F.

AU - Fernandes, Rui

AU - Almeida, Pedro M.

AU - Carvalho, Alexandra

AU - Feio, Gabriel

AU - Silva, Cristina L.M.

AU - Quintas, Mafalda A.C.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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.

AB - 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.

KW - Edible films

KW - Microstructure

KW - Molecular dynamics

KW - NMR

KW - Structure-function

KW - Water behaviour

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SN - 0308-8146

VL - 144

SP - 2

EP - 8

JO - Food Chemistry

JF - Food Chemistry

ER -

Molecular mobility, composition and structure analysis in glycerol plasticised chitosan films

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Keywords

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