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Appl. Environ. Microbiol., Jul 1995, 2533-2539, Vol 61, No. 7
Copyright © 1995, American Society for Microbiology

Modelling Bacterial Growth of Lactobacillus curvatus as a Function of Acidity and Temperature

T Wijtzes, JC de Wit, JHJ Huis in't Veld, K van't Riet and MH Zwietering
Department of Food Science, Wageningen Agricultural University; TNO-Nutrition and Food Research, Zeist; and School of Veterinary Medicine, University of Utrecht, The Netherlands

Models that describe the effect of acidity, temperature, and the combined effect of these variables on the growth parameters of Lactobacillus curvatus are developed and validated. Growth parameters (lag time, specific growth rate, and maximum population density) were calculated from growth data at different temperature-acidity combinations. Experiments were set up to assess the quantitative effects of temperature and acidity on the growth parameters rather than for parameter estimation solely. The effect of acidity is monitored at several constant temperature values. Models are set up and fitted to the data. The same procedure is used at constant acidity values to model the effect of temperature. For lag time, specific growth rate, and maximum population density, the effect of temperature could be multiplied with the effect of acidity to obtain combinatory models that describe the effect of both controlling factors on the growth parameters. Lag time measurements showed large deviations, and therefore the lag time models developed can only be used to estimate the order of magnitude of lag time.

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