PMID: 11934021Apr 6, 2002Paper

Proposal of a novel parameter to describe the influence of pH on the lag phase of Listeria monocytogenes

International Journal of Food Microbiology
Robin C McKellarK P Knight

Abstract

Predictive models for lag phase duration (lambda) have been less reliable than specific growth rate (mu) models due, in part, to the influence of the pre-growth environment on lambda. A discrete modelling approach was taken to more completely define the response of individual cells to new environments. Time to detection (td) data was obtained from serial twofold dilutions of Listeria monocytogenes growing in a Bioscreen at 30 degrees C. Comparison of the inoculum densities required to achieve maximum td at growth pH values from 7.2 to 4.7 revealed that, as the growth pH decreased, fewer cells were capable of making the transition to the exponential phase. The proportion of these cells (termed "adaptable cells") in the original inoculum was used to define a new parameter (r0) which, when combined with the constant mean individual cell physiological state parameter (p0), the variation in p0 (SDp0), the inital inoculum (N0) and the maximum population density (Nmax) was able to simulate a complete growth curve. Power transformations with rescaled explanatory variables provided suitable models for the influence of pH on mu, r0, and SDp0, (r2>0.70).

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Apr 6, 2002·International Journal of Food Microbiology·R C McKellarK P Knight

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Citations

Apr 6, 2002·International Journal of Food Microbiology·R C McKellarK P Knight
Feb 24, 2016·International Journal of Food Microbiology·Juan S Aguirre, Konstantinos P Koutsoumanis
Sep 17, 2005·Biotechnology and Bioengineering·Liju YangRashid Bashir
Mar 10, 2006·Journal of Theoretical Biology·Clara PratsJoaquim Valls
Jan 3, 2006·International Journal of Food Microbiology·L MilletM C Montel
Oct 18, 2005·International Journal of Food Microbiology·Francisco Noé Arroyo LópezAntonio Garrido Fernández
Jul 12, 2005·International Journal of Food Microbiology·Konstantinos P Koutsoumanis, John N Sofos
Sep 15, 2016·Critical Reviews in Food Science and Nutrition·Tian DingDong-Hong Liu
Apr 28, 2005·International Journal of Food Microbiology·Louis CorollerDominique Thuault
Apr 16, 2004·Journal of Food Protection·Yildiz KaraibrahimogluKimberly Sokorai

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