Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 20, Issue 1, Pages 43-52Publisher
SPRINGER
DOI: 10.1007/s10924-011-0336-y
Keywords
Packaging materials; Chitosan; Biodegradable films; Methylcellulose; Gamma radiation
Categories
Funding
- Ministry of Agriculture, Fisheries and Food of the province of Quebec
- International Atomic Energy Agency (IAEA)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- le Fond de Recherche sur la Nature et les Technologies (FQRNT)
- BSA Food Ingredients s.e.c/l.p
- [14756]
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Chitosan (0.1-1%, w/w), dissolved in 2% acetic acid solution, was added into 1% methylcellulose (MC)-based formulation containing 0.5% vegetable oil, 0.25% glycerol and 0.025% Tween(A (R))80. Films were prepared by casting. Puncture strength (PS), puncture deformation (PD), viscoelasticity coefficient and water vapour permeability (WVP) of the films were measured. The PS value of 312 N/mm was observed for MC-based films containing 0.25% chitosan. Values of PD, viscoelasticity coefficient and WVP of these films were 5.0 mm, 44.1%, and 6.0 g mm/m(2) day kPa, respectively. The MC-based films containing 0.25% chitosan were also exposed to gamma radiation (0.5-50 kGy). The PS of the treated films decreased significantly from 312 at 0 kGy to 201 N/mm when treated at a dose of 50 kGy. However, WVP values were not affected by increasing irradiation the dose used. The Fourier Transform Infrared spectroscopy supported the molecular interactions due to addition of chitosan in MC-based films. Thermo gravimetric analysis and differential scanning calorimetric experiments showed that thermal properties of the films were significantly improved by chitosan loading. Surface topography of the films was studied by scanning electron microscopy and found rougher due to chitosan addition.
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