Temperature effect on the moisture sorption isotherms for methylcellulose and ethylcellulose films

Moisture sorption isotherms were obtained at 9°C, 15°C, 20°C, 25°C and 35°C for methylcellulose (MC) and ethylcellulose (EC) films following the normalized microclime method. Cast MC and EC film samples were equilibrated to 0.22, 0.44, 0.57, 0.75, and 0.90 a w values. MC films had an equilibrium moi...

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Bibliographic Details
Published in:Journal of food engineering 2001-04, Vol.48 (1), p.91-94
Main Authors: de la Cruz, G.Velázquez, Torres, J.A, Martı́n-Polo, M.O
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Cellulose
Ethylcellulose
Exact sciences and technology
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
Handling, storage, packaging, transport
Isotherms
Methylcellulose
Moisture
Moisture sorption
Natural polymers
Physicochemistry of polymers
Starch and polysaccharides
Thermal effects
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Summary:Moisture sorption isotherms were obtained at 9°C, 15°C, 20°C, 25°C and 35°C for methylcellulose (MC) and ethylcellulose (EC) films following the normalized microclime method. Cast MC and EC film samples were equilibrated to 0.22, 0.44, 0.57, 0.75, and 0.90 a w values. MC films had an equilibrium moisture content about five times higher than the EC films. The Guggenheim–Anderson–deBöer (GAB) and Brunauer–Emmett–Teller (BET) equations were fitted to the experimental data using nonlinear regression. The regression coefficient ( R 2) used to evaluate model fit showed a best fit for the GAB model. The monolayer moisture content ( x m) decreased with temperature and correlated better with values calculated using the BET equation.
ISSN:0260-8774
1873-5770
DOI:10.1016/S0260-8774(00)00143-6