BACTERICIDAL EFFICIENCIES OF COMMERCIAL DISINFECTANTS AGAINST <i>LISTERIA MONOCYTOGENES</i> ON SURFACES

TLDR

The study evaluated the bactericidal efficiencies of nine commercial disinfectants and a hypochlorite‑based cleaning agent against eight Listeria monocytogenes strains representing three ribotypes in suspension and surface tests. In suspension tests, all disinfectants achieved ≥99.9 % kill within 30 s at the lowest recommended concentrations; on clean surfaces they were effective after 5 min at average concentrations, but only five of nine were effective on soiled surfaces, with isopropanol‑based agents showing the highest efficacy and tertiary alkylamine/dimethyl alamine betaine the lowest, and strain‑dependent differences were observed on meat‑soiled surfaces.

Abstract

ABSTRACT The efficiencies of potassium persulphate, isopropanol, hydrogen peroxide and peracetic acid, quaternary ammonium compound, hypochlorite, sodium dichloroisocyanurate, ethanol and phenol derivatives, tertiary alkylamines and dimethyl alamine betaine‐based disinfectants and a hypochlorite‐based disinfecting cleaning agent were evaluated against eight Listeria monocytogenes strains representing three different ribotypes. All the disinfectants were effective in a suspension test with an exposure time of 30 s at the lowest concentrations recommended by the manufacturer. The efficiencies on surfaces were reduced. However, on clean surfaces all the agents were considered effective when the exposure time was 5 min and the concentration was the average recommended by the manufacturer. Five of nine disinfectants and the disinfecting cleaning agent were considered effective in soiled conditions in the surface test. The most efficient agent was isopropanol‐based and the least effective was the disinfectant containing tertiary alkylamine and dimethyl alamine betaine. Differences in bactericidal efficiencies of disinfectants against different L. monocytogenes strains on meat soiled surfaces were found.