Antimicrobial effects of sanitizers against planktonic and sessile Listeria monocytogenes cells according to the growth phase.
This study was designed to investigate the individual or combined effects of sanitizers on survival of planktonic or sessile Listeria monocytogenes cells at different phase of growth. The sanitizers tested included: (i) acetic acid (pH 5.0), (ii) NaOH (pH 12.0), (iii) 10% Na2SO4, (iv) 10% Na2SO4 and acetic acid (pH 5.0), (v) 10% Na2SO4 and NaOH (pH 12.0), (vi) a quaternary ammonium (20 ppm) and (vii) glyceryl monolaurate (75 ppm). Results revealed a great efficacy of alkaline treatments on both sessile and planktonic cells with a slightly higher resistance of 6 h biofilms. Quaternary ammonium appeared very effective in killing more than 98% of cells, but a resistance of 7 days biofilm was observed. Other sanitizers did not succeed in inhibiting totally the pathogen but acted in a similar way on both sessile and planktonic cells. Renewing the medium or not do not seem to be the major cause of a resistance emergence.
Chavant
Patrick
P
Microbiologie, Unité de Recherche sur la Viande, Institut National de la Recherche Agronomique de Theix, 63122 Saint-Genès Champanelle, France.
Gaillard-Martinie
Brigitte
B
Hébraud
Michel
M
D019342:Acetic Acid / Q000494:pharmacology; D001548:Benzalkonium Compounds / Q000494:pharmacology; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development*; D015169:Colony Count, Microbial; D003470:Culture Media / Q000737:chemistry; D004202:Disinfectants / Q000494:pharmacology*; D024901:Drug Resistance, Multiple, Bacterial; D005989:Glycerides / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007848:Laurates / Q000494:pharmacology; D008089:Listeria monocytogenes / Q000166:cytology / Q000187:drug effects* / Q000254:growth & development*; D008826:Microbial Sensitivity Tests; D008855:Microscopy, Electron, Scanning; D050178:Monoglycerides; D010933:Plankton / Q000187:drug effects / Q000254:growth & development; D012972:Sodium Hydroxide / Q000494:pharmacology; D013431:Sulfates / Q000494:pharmacology
D001548:Benzalkonium Compounds; D003470:Culture Media; D004202:Disinfectants; D005989:Glycerides; D007848:Laurates; D050178:Monoglycerides; D013431:Sulfates; C012036:sodium sulfate; C005883:zephiramine; C020777:monolaurin; D012972:Sodium Hydroxide; D019342:Acetic Acid