Title: X-ray CT for quantitative food microstructure engineering: The apple case
Authors: Herremans, Els ×
Verboven, Pieter
Defraeye, Thijs
Rogge, Seppe
Ho, Quang Tri
Hertog, Maarten
Verlinden, Bert
Bongaers, Evi
Wevers, Martine
Nicolai, Bart #
Issue Date: 2014
Publisher: Elsevier
Series Title: Nuclear Instruments & Methods in Physics Research B vol:324 pages:88-94
Abstract: Apple fruit is a major crop that can be supplied year-round due to low temperature storage in a controlled
atmosphere with a reduced oxygen concentration and an increased carbon dioxide concentration. The
low temperature and dedicated gas concentration levels are designed to provide optimal conditions that
prevent ripening while maintaining the fundamental respiratory metabolism necessary for energy supply
in the cells that ensures cell and tissue integrity during storage of the fruit. If the concentration of oxygen
is too low or that of carbon dioxide too high, a fermentation metabolism is induced that causes the production
of off-flavours, results in insufficient energy supply, leading to cell collapse and consequent tissue
browning and cavity formation. The microstructural arrangement of cells and intercellular spaces in the
apple create specific pathways for transport of the respiratory gasses oxygen and carbon dioxide. We
used X-ray CT to characterise the changes in the microstructure of ‘Braeburn’ apple during the development
of internal storage disorders. Multiscale modeling was applied to understand the changes in oxygen
and carbon dioxide concentrations and respiration and fermentation rates in the apple during the disorder
development in controlled atmosphere storage of ‘Braeburn’ apple fruit. The 3D microstructure
geometries of healthy, brown tissue and tissue with cavities were created to solve the micro-scale gasexchange
model for O2 and CO2 using the finite volume method. The apparent gas diffusivities of the tissue
were calculated and implemented in the macroscale geometry of healthy and disordered apples to
study in detail the changes in the respiratory metabolism of the fruit.
ISSN: 0168-583X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Mechatronics, Biostatistics and Sensors (MeBioS)
Structural Composites and Alloys, Integrity and Nondestructive Testing
× corresponding author
# (joint) last author

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