Journal
FOOD RESEARCH INTERNATIONAL
Volume 123, Issue -, Pages 373-382Publisher
ELSEVIER
DOI: 10.1016/j.foodres.2019.05.008
Keywords
Listeria monocytogenes; Biocide resistance; Minimal inhibitory concentration (MIC); Biofilm susceptibility; Benzalkonium chloride (BAC); Peracetic acid (PAA)
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Funding
- [RTA2014-00045-C03-01]
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The main goal of this work was to approach food industry conditions in the comparison of the susceptibility of biofilms of Listeria monocytogenes to the biocides benzalkonium chloride (BAC) and peracetic acid (PAA). Twelve isolates of L. monocytogenes, including nine well characterized BAC resistant strains were used. Biofilms were produced on stainless steel coupons (SSC), at 11 degrees C (refrigeration temperature) or at 25 degrees C (room temperature), in culture media simulating clean (nutrient limiting) or soiled (nutrient rich) growth conditions. Neither different nutrient availability nor growth temperature showed significant effect (p > .05) on biofilm formation. PAA confirmed to be more effective than BAC in biofilm elimination. Biofilms formed under nutritional stress tended to differentiate more the response to BAC of the resistant or sensitive strains, but the resistant or sensitive phenotype of the planktonic cells did not dictate biofilm susceptibility.
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