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

被引：28
作者：
Fundo, Joana F. [1 ]
Fernandes, Rui [2 ]
Almeida, Pedro M. [3 ,4 ]
Carvalho, Alexandra [4 ]
Feio, Gabriel [4 ]
Silva, Cristina L. M. [1 ]
Quintas, Mafalda A. C. [1 ,5 ]
机构：
[1] Univ Catolica Portuguesa, Ctr Reg Porto, Escola Super Biotecnol, CBQF, Porto, Portugal
[2] Univ Porto, IBMC, HEMS, P-4100 Porto, Portugal
[3] IPL, ADF Inst Super Engn Lisboa, Lisbon, Portugal
[4] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Ciencia Mat, CENIMAT I3N, Caparica, Portugal
[5] Univ Minho, Ctr Biol Engn, IBB, Braga, Portugal
来源：
FOOD CHEMISTRY | 2014年 / 144卷
关键词：
Edible films; Microstructure; NMR; Molecular dynamics; Structure-function; Water behaviour; WATER ACTIVITY; STARCH; FOOD; STATE; RELAXATION; MICROSCOPY; H-1-NMR;
D O I：
10.1016/j.foodchem.2013.05.127
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
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.
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收藏
页码：2 / 8
页数：7
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