Open Access Repository

Modeling the Behavior of Listeria Monocytogenes in pH- Modified Chicken Salad During Cold Storge and Temperature Abuse Conditions


Downloads per month over past year

Guentert, AM, Mohtar, RH, Linton, RH, Tamplin, ML and Luchansky, JB 2006 , 'Modeling the Behavior of Listeria Monocytogenes in pH- Modified Chicken Salad During Cold Storge and Temperature Abuse Conditions' , Journal of Food Process Engineering, vol. 29, no. 1 , pp. 89-117 , doi: 10.1111/j.1745-4530.2006.00045.x.

[img] PDF
Guentert_JFPE_2...pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.


Listeria monocytogenes grows at refrigeration temperatures (5C or below) and tolerates various environmental stressors. The Food and Drug Administration specifies a zero tolerance for this pathogen in certain ready-to-
eat processed foods. Modeling its dynamic behavior to fluctuation in temperature at various pH levels is critical to the safety of food. This study presents linear and nonlinear models to predict the behavior of L. monocytogenes
in pH-modified chicken salad at various cold storage and temperature abuse conditions. A linear model of the kinetics accounting for simple and interactive effects of storage time, temperature and pH was developed. Predictions
of the linear model were inconsistent with laboratory observations. The limitations of the linear model were reflected in the poor correlation of model predictions to the observed values (r2 = 0.58). A proposed nonlinear
model was therefore used to model the observed data. The four model parameters (N(0), Cc(0), kmax and Nres ) were optimized for each of the nine treatments. Correlation coefficient (r2) values ranged from 0.70 (pH 5.2, 7.2C) to
0.99 (pH 4.0, 21.1C), indicating an improved accuracy. Developing a functional and validated microbial predictive model for chicken salad requires further analyses and collection of data at additional pH and temperature
values to determine a single set of parameter values that would represent the microbial behavior at the full range of pH and temperatures observed under storage conditions. Future experiments should address the adaptive nature of
L. monocytogenes, as the response to environmental stressors affects the survival of the organism in food systems.

Item Type: Article
Authors/Creators:Guentert, AM and Mohtar, RH and Linton, RH and Tamplin, ML and Luchansky, JB
Keywords: microbial modelling, microbial inactivation, food safety
Journal or Publication Title: Journal of Food Process Engineering
ISSN: 0145-8876
DOI / ID Number: 10.1111/j.1745-4530.2006.00045.x
Additional Information:

The definitive version is available at

Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page