Sorption of water vapour by K- and Ca-furcellaran films

Sorption of water vapour by films of the food polysaccharide furcellaran at 22, 35 and 50°C in the vapour activity range 0.1–0.96 is reported. The sorption isotherm data are well described by the localized sorption model at low activities. At high penetrant activities, clustering of water is suggest...

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Published in:Food hydrocolloids 1994, Vol.8 (3), p.251-258
Main Authors: Ptitchkina, N.M., Chalykh, A.Ye
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Language:English
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Furcellaria fastigiata
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description Sorption of water vapour by films of the food polysaccharide furcellaran at 22, 35 and 50°C in the vapour activity range 0.1–0.96 is reported. The sorption isotherm data are well described by the localized sorption model at low activities. At high penetrant activities, clustering of water is suggested by a Zimm-Lundberg analysis of the sorption data. Influence of Ca 2+ and K + cations on the sorption capacity, free energy and enthalpy of sorption is presented and discussed. Diffusion coefficients of water within the polymer matrix are calculated using the long-time approximation for sorption kinetic data. The D values are 5 × 10 −13 −7 × 10 −12 m 2/s under the experimental conditions used. The values of activation energy are 32–34 kJ/mol for both Ca- and K-furcellaran.
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title Sorption of water vapour by K- and Ca-furcellaran films
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