Kinetics of food biopolymer film dehydration: Experimental studies and mathematical modeling

Ettelaie, Rammile, Tasker, Alison, Chen, Jianshe and Alevisopoulos, Stefan (2013) Kinetics of food biopolymer film dehydration: Experimental studies and mathematical modeling. Industrial and Engineering Chemistry Research, 52 22: 7391-7402. doi:10.1021/ie3033075

Author Ettelaie, Rammile
Tasker, Alison
Chen, Jianshe
Alevisopoulos, Stefan
Title Kinetics of food biopolymer film dehydration: Experimental studies and mathematical modeling
Journal name Industrial and Engineering Chemistry Research   Check publisher's open access policy
ISSN 0888-5885
Publication date 2013-05
Sub-type Article (original research)
DOI 10.1021/ie3033075
Volume 52
Issue 22
Start page 7391
End page 7402
Total pages 12
Place of publication Washington DC, United States
Publisher American Chemical Society
Language eng
Subject 1500 Chemical Engineering
1600 Chemistry
2209 Industrial and Manufacturing Engineering
Formatted abstract
The dehydration process in thin biopolymer-based films, involving the two main macromolecules in food systems, namely, proteins and polysaccharides, has been investigated. Experimental measurements of the weight loss of polymer films were carried out in an enclosed Perspex chamber under controlled conditions of temperature, relative humidity, and air flow. We found that all of the experimental moisture ratio data for films of pure biopolymers, as well as their mixtures, can be superimposed on a single scaled dehydration curve. According to theoretical calculations, this curve cannot be described by a moisture diffusion-dominated drying process, irrespective of whether film shrinkage is included or ignored. We also derived an analytical expression for evaporation-controlled drying. When film shrinkage is fully taken into account in the calculations, very good agreement between the experiments and the theoretically derived curve is obtained. However, the theoretical results can be improved even further by considering a model that includes both diffusion and evaporation processes, with diffusion being fast but nonetheless finite, so as to only play a minor secondary role in the dehydration of such films. Theoretical models have also been extended to describe systems in which film shrinkage can also arise from changes in the partial molar volume and not just loss of moisture. Using a variable "effective" partial molar volume for water provides a possible method for modeling the entire drying process over different stages of dehydration in which the solid phase adopts significantly contrasting structures.
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Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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