Journal of Food, Agriculture and Environment

Vol 7, Issue 3&4,2009
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Simple microbial growth model applicable to dynamic temperature conditions: Evaluation of a nondimensional model


So Jung Kim, Dong Sun Lee *

Recieved Date: 2009-07-12, Accepted Date: 2009-09-26


A nondimensional model for microbial growth applicable to fluctuating temperature conditions was examined and tested against the aerobic bacterial count data of pan-fried meat patties. In description of time-dependent microbial growth, the model uses a logistic function which is subsequently normalized into nondimensional one incorporating square root equation for the temperature dependent growth rate. This model has advantage of simplicity and easy compatibility with common widespread software program such as spreadsheet. Model parameters were obtained from constant temperature storage data and incorporated into the model’s iteration formula to predict the microbial growth under dynamic temperature conditions. Its limitation was identified and relieved by fine-tuning the variable of initial microbial load in the iteration scheme of the model. Proper definition of initial microbial state and account on temperature dependence of maximum cell density are suggested for more versatile and powerful application of the model.


Microbial growth model, dynamic temperature, pan-fried meat patties, logistic function, square root model

Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 3&4
Category: Food and Health
Pages: 192-196

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