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Title: Theoretical consideration on the influence of the z-value of a single-component time-temperature integrator on thermal-process impact evaluation
Authors: Van Loey, Ann ×
Ludikhuyze, Linda
Hendrickx, Marc
Decordt, S
Tobback, Paul #
Issue Date: Jan-1995
Publisher: Int assoc milk food environmental sanitarians, inc
Series Title: Journal of food protection vol:58 issue:1 pages:39-48
Abstract: The allowed difference in z-value between a single component time/temperature integrator (SCTTI) and target attribute to measure the impact of a thermal process with a given accuracy was examined theoretically. For isothermal heating profiles, the issue and the degree of over- or underestimation of the actual process-value can be predicted as a function of z-value difference and reference temperature. The closer the processing temperature approaches reference temperature, the larger the allowed difference in z-value. As target attributes are characterized by a higher z-value, the allowed z-value difference between SCTTI and target attribute increases. For non-isothermal heating profiles, over- or underestimation depends in addition on the temperature history of the product. In order to obtain a safe estimate of the impact value, whatever the shape of the time/temperature profile, a new approach is suggested based on a SCTTI with a z-value below the target z-value in combination with the use of a reference temperature above or equal to the maximum processing temperature.
ISSN: 0362-028X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Food and Microbial Technology
Quantum Chemistry and Physical Chemistry Section
× corresponding author
# (joint) last author

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