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Authors
Advisor(s)
Abstract(s)
A simple analytical expression aimed at assessing the theoretical reliability of a full-history time-temperature indicator placed on the surface of a food item as a predictor of the remaining shelf-life in the presence of heat transfer limitations within the food is obtained. Such expression, which depends on three dimensionless parameters only, can be written as a univariate function of a single parameter containing the thermal properties of the food via a suitable algebraic scaling. the derivation of the relevant formulae is based on the integration of a generic quality function across the slab-shaped food item under the assumption that the temperature on the surface of the food undergoes a sinusoidal variation with time. the analysis reported is useful because it provides a quick estimate of the effect of the thermal diffusivity of the food on the relative error associated with the use of a TT1 when the activation energies of the food and the indicator are matched (as should happen in the idealistic case) under realistic environmental conditions of storage.
Description
Keywords
Pedagogical Context
Citation
MALCATA, F. Xavier - The effect of internal thermal gradients on the reliability of surface mounted full-history time-temperature indicators. Journal of Food Processing and Preservation. ISSN 1745-4549. Vol. 14, n.º 6 (1990), p. 481-497
Publisher
Wiley Blackwell