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Survival of Listeria monocytogenes in commercial food-processing equipment cleaning solutions and subsequent sensitivity to sanitizers and heat.

Abstract：

AIMS:To determine the ability of Listeria monocytogenes to survive exposure to commercial food-processing equipment cleaning solutions and subsequent treatment with sanitizers or heat. METHODS AND RESULTS:Cells of five strains of L. monocytogenes were suspended in 1% solutions of eight commercial cleaners (pH 7.1-12.5) or in water (control) and incubated at 4 degrees C for 30 min or 48 h before populations were determined by plating on tryptose phosphate agar. After exposure of cells to cleaning solutions for 30 min, populations of the most resistant strain of L. monocytogenes were reduced by < or = 1.63 log10 cfu ml(-1). In only three highly alkaline cleaning solutions (pH 11.6-12.4) were populations reduced significantly (P < or = 0.05) compared with reductions in water. After 48 h, populations were significantly higher in one cleaning solution (pH 10.4) than in water, while populations in six of the other seven cleaning solutions were reduced by > or = 4.72 log10 cfu ml(-1). Cells exposed to cleaning solutions for 30 min became sensitive to 4.0 or 6.0 mg l(-1) free chlorine and to 50 or 100 mg l(-1) benzalkonium chloride and cetylpyridinium chloride, common components of quaternary ammonium sanitizers. Cells exposed to four of the five test cleaners had D56 degrees C values less than or equal to those of the control cells. CONCLUSIONS:Listeria monocytogenes tolerates exposure to a high concentration of alkaline cleaning solutions but consequently becomes sensitized to sanitizers. SIGNIFICANCE AND IMPACT OF THE STUDY:The elimination of L. monocytogenes surviving exposure to alkaline cleaning solutions widely used for food-processing equipment is essential and the appropriate use of sanitizers for subsequent application to equipment is important in achieving this goal.

journal_name

J Appl Microbiol

journal_title

Journal of applied microbiology

authors

Taormina PJ,Beuchat LR

doi

10.1046/j.1365-2672.2002.01488.x

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

71-80

issue

eissn

1364-5072

issn

1365-2672

pii

1488

journal_volume

pub_type

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Survival of Listeria monocytogenes in commercial food-processing equipment cleaning solutions and subsequent sensitivity to sanitizers and heat.