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JXB Advance Access originally published online on November 3, 2006
Journal of Experimental Botany 2006 57(15):4215-4224; doi:10.1093/jxb/erl198
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

A permeation–diffusion–reaction model of gas transport in cellular tissue of plant materials

Q. Tri Ho1,*, Bert E. Verlinden1, Pieter Verboven1, Stefan Vandewalle2 and Bart M. Nicolaï1

1BIOSYST-MeBioS, Faculty of Bioscience Engineering, Katholieke Universiteit Leuven, Willem de Croylaan 42, B-3001 Leuven, Belgium
2Scientific Computing Research Group, Computer Science Department, Katholieke Universiteit Leuven, Celestijnenlaan 200A, B-3001 Leuven, Belgium

* To whom correspondence should be addressed. E-mail: quangtri.ho{at}biw.kuleuven.be

Gas transport in fruit tissue is governed by both diffusion and permeation. The latter phenomenon is caused by overall pressure gradients which may develop due to the large difference in O2 and CO2 diffusivity during controlled atmosphere storage of the fruit. A measurement set-up for tissue permeation based on unsteady-state gas exchange was developed. The gas permeability of pear tissue was determined based on an analytical gas transport model. The overall gas transport in pear tissue samples was validated using a finite element model describing simultaneous O2, CO2, and N2 gas transport, taking into account O2 consumption and CO2 production due to respiration. The results showed that the model described the experimentally determined permeability of N2 very well. The average experimentally determined values for permeation of skin, cortex samples, and the vascular bundle samples were (2.17±1.71)x10–19 m2, (2.35±1.96)x10–19 m2, and (4.51±3.12)x10–17 m2, respectively. The permeation–diffusion–reaction model can be applied to study gas transport in intact pears in relation to product quality.

Key words: Controlled atmosphere, diffusion, gas transport, measurement set-up, modelling, permeation, storage, Pyrus communis


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[Abstract] [Full Text] [PDF]


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