Acid and heat tolerance of persistent and nonpersistent Listeria monocytogenes food plant strains

Letters in Applied Microbiology
J LundénH J Korkeala

Abstract

Acid and heat tolerance of 17 persistent and 23 nonpersistent Listeria monocytogenes strains, recovered from three meat-processing plants, were investigated. The isolates were genotyped by pulsed-field gel electrophoresis and categorized into persistent strains according to the frequency of the strain and duration of the contamination. The persistent and nonpersistent strains were challenged to acidic conditions (pH 2.4 for 2 h, 1 mol l(-1) HCl were used to acidify the suspension) and to heat (55 degrees C for 40 min) to receive a reduction in cell count. Listeria monocytogenes strains showed large variation in acid tolerance (over 6 log units) and in heat tolerance (3 log units). The persistent strains showed higher tolerance to acidic conditions than the nonpersistent strains (Student's t-test, P = 0.02), but significant differences in heat tolerance between persistent and nonpersistent strains were not observed. The results indicate that acid tolerance may have an effect on the persistence of L. monocytogenes contamination. This study highlights the fact that there are great differences in acid and heat tolerances between L. monocytogenes strains, and the preventive measures should be designed to be effective against the mos...Continue Reading

References

Jun 20, 1998·Journal of Applied Microbiology·M A CasadeiJ E Gaze
Apr 1, 1999·International Journal of Food Microbiology·M K MiettinenH J Korkeala
Apr 23, 1999·Journal of Applied Microbiology·D E Norwood, A Gilmour
Jun 17, 2000·International Journal of Food Microbiology·G A Dykes, S M Moorhead
Mar 17, 2001·Journal of Food Protection·M E DoyleV N Scott
May 7, 2003·Applied and Environmental Microbiology·Adriana FerreiraKathryn J Boor
Nov 25, 2003·Journal of Food Protection·Janne M LundénHannu J Korkeala

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Citations

Nov 5, 2013·International Journal of Food Microbiology·Alexandra Lianou, Konstantinos P Koutsoumanis
Feb 1, 2011·International Journal of Food Microbiology·Brigitte Carpentier, Olivier Cerf
May 18, 2010·International Journal of Food Microbiology·Birte Fonnesbech VogelLone Gram
Jan 10, 2017·Biotechnology and Bioengineering·Eduardo XimenesMichael Ladisch
Jan 24, 2018·EFSA Journal·UNKNOWN EFSA Panel on Biological Hazards (BIOHAZ)Roland Lindqvist
Mar 1, 2014·Comprehensive Reviews in Food Science and Food Safety·Restituto TocmoHyun-Gyun Yuk

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