Omnibus Modeling of Listeria monocytogenes Growth Rates at Low Temperatures

Listeria monocytogenes is a pathogen of considerable public health importance with a high case fatality. L. monocytogenes can grow at refrigeration temperatures and is of particular concern for ready-to-eat foods that require refrigeration. There is substantial interest in conducting and modeling sh...

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Bibliographic Details
Published in:Foods 2021-05, Vol.10 (5), p.1099
Main Authors: Pennone, Vincenzo, Gonzales-Barron, Ursula, Hunt, Kevin, Cadavez, Vasco, McAuliffe, Olivia, Butler, Francis
Format: Article
Language:English
Subjects:
Datasets
Environmental conditions
Food
Food science
Growth models
Growth rate
Huang model
Lag phase
Listeria
Listeria monocytogenes
Low temperature
Modelling
omnibus modeling
Parameter estimation
Phase transitions
Population
predictive microbiology
Public health
Refrigeration
Regression models
Seafood
Shelf life
Storage temperature
Variance analysis
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Summary:Listeria monocytogenes is a pathogen of considerable public health importance with a high case fatality. L. monocytogenes can grow at refrigeration temperatures and is of particular concern for ready-to-eat foods that require refrigeration. There is substantial interest in conducting and modeling shelf-life studies on L. monocytogenes, especially relating to storage temperature. Growth model parameters are generally estimated from constant-temperature growth experiments. Traditionally, first-order and second-order modeling (or primary and secondary) of growth data has been done sequentially. However, omnibus modeling, using a mixed-effects nonlinear regression approach, can model a full dataset covering all experimental conditions in one step. This study compared omnibus modeling to conventional sequential first-order/second-order modeling of growth data for five strains of L. monocytogenes. The omnibus model coupled a Huang primary model for growth with secondary models for growth rate and lag phase duration. First-order modeling indicated there were small significant differences in growth rate depending on the strain at all temperatures. Omnibus modeling indicated smaller differences. Overall, there was broad agreement between the estimates of growth rate obtained by the first-order and omnibus modeling. Through an appropriate choice of fixed and random effects incorporated in the omnibus model, potential errors in a dataset from one environmental condition can be identified and explored.
ISSN:2304-8158
2304-8158
DOI:10.3390/foods10051099