Journal
FOOD HYDROCOLLOIDS
Volume 21, Issue 1, Pages 66-72Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2006.02.001
Keywords
composite films; chitosan; methylcellulose; microstructure; barrier and mechanical properties
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Biodegradable films obtained from chitosan (CH) and methylcellulose (MC) can reduce environmental problems associated with synthetic packagings. Biodegradable films still need a cost reduction to be economically profitable; the use of CH, a by-product obtained from wastes of the fishing industry would be a good alternative. The objectives of the present work were to characterize physical, mechanical and water vapor barrier properties and microstructure of films of CH, MC and their mixtures. Solutions of 2% CH and 1% MC were mixed in different proportions. Films were obtained by casting. Film microstructure was characterized by SEM, X-ray diffraction and FTIR spectroscopy. Water vapor permeabilities for CH and MC films were 6.67 +/- 0.74 x 10(-11) and 7.55 +/- 0.60 x 10(-11) g/s in Pa, respectively; composite film permeabilities did not differ significantly from these values. CH films showed rigid characteristics (high elastic modulus and low elongation). Flexibility of composite films increased with increasing MC content, the higher elongation and lower elastic modulus of composite films indicated the relevance of hydrocolloid interactions. (c) 2006 Elsevier Ltd. All rights reserved.
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