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Journal of Veterinary Research

formerly Bulletin of the Veterinary Institute in Pulawy

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IMPACT FACTOR Bull Vet Inst Pulawy 2016: 0.462

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2450-8608
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Modelling the growth rate of Listeria monocytogenes in cooked ham stored at different temperatures

Jacek Szczawiński
  • Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, University of Life Sciences, 02-776 Warsaw, Poland
  • Email:
/ Małgorzata Ewa Szczawińska
  • Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, University of Life Sciences, 02-776 Warsaw, Poland
/ Adriana Łobacz
  • Chair of Dairy and Quality Management, Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland
/ Michał Tracz
  • Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, University of Life Sciences, 02-776 Warsaw, Poland
/ Agnieszka Jackowska-Tracz
  • Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, University of Life Sciences, 02-776 Warsaw, Poland
Published Online: 2017-04-04 | DOI: https://doi.org/10.1515/jvetres-2017-0006

Abstract

Introduction: The purpose of the study was to determine and model the growth rates of L. monocytogenes in cooked cured ham stored at various temperatures.

Material and Methods: Samples of cured ham were artificially contaminated with a mixture of three L. monocytogenes strains and stored at 3, 6, 9, 12, or 15°C for 16 days. The number of listeriae was determined after 0, 1, 2, 3, 5, 7, 9, 12, 14, and 16 days. A series of decimal dilutions were prepared from each sample and plated onto ALOA agar, after which the plates were incubated at 37°C for 48 h under aerobic conditions. The bacterial counts were logarithmised and analysed statistically. Five repetitions of the experiment were performed.

Results: Both storage temperature and time were found to significantly influence the growth rate of listeriae (P < 0.01). The test bacteria growth curves were fitted to three primary models: the Gompertz, Baranyi, and logistic. The mean square error (MSE) and Akaike’s information criterion (AIC) were calculated to evaluate the goodness of fit. It transpired that the logistic model fit the experimental data best. The natural logarithms of L. monocytogenes’ mean growth rates from this model were fitted to two secondary models: the square root and polynomial.

Conclusion: Modelling in both secondary types can predict the growth rates of L. monocytogenes in cooked cured ham stored at each studied temperature, but mathematical validation showed the polynomial model to be more accurate.

Keywords: ham; storage; Listeria monocytogenes; predictive modelling

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About the article

Received: 2016-08-23

Accepted: 2017-03-10

Published Online: 2017-04-04

Published in Print: 2017-03-01



Citation Information: Journal of Veterinary Research, ISSN (Online) 2450-8608, DOI: https://doi.org/10.1515/jvetres-2017-0006. Export Citation

© 2017 Jacek Szczawiński et al., published by De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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