Abstract
ABSTRACTTwo mathematical descriptions based on (1) a modified and additive Arrhenius equation and (2) a modified Arrhenius temperature characteristic equation were developed to describe the combined effects of time, temperature and initial gas composition of modified atmosphere storage on the population growth rate coefficients of Listeria monocytogenes and Pseudomonas fluorescens. Statistical analysis revealed that there was no significant interaction of temperature with [O2]/(1 + [CO2]) ratio, such that a combined temperature and gas composition ratio term was not needed in an additive Arrhenius description. the Arrhenius temperature characteristic term (μ) was found to be related to the [O2]/(1 + [CO2]). Growth rate coefficients of bacterial populations could be estimated by substituting a term functionally relating to [O2]/(1 + [CO2]) ratio for the μ coefficient in the Arrhenius expression. the mathematical descriptions were shown applicable for determining bacterial population growth rate coefficients in modified atmosphere storage for oxygen concentration from 0 to 20.99% and carbon dioxide concentration from 0.03 to 80%.
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