Inactivation of several strains of Listeria monocytogenes attached to the surface of packaging material by Na-Chlorophyllin-based photosensitization.

Abstract

This study was focused on the possibility to inactivate thermosensitive Listeria monocytogenes ATC(L3)C 7644 and thermoresistant 56 Ly strain by Na-Chlorophyllin (Na-Chl)-based photosensitization in vitro and on the surface of packaging. Comparative analysis of antimicrobial efficiency of photosensitization with conventional surface cleaning was performed. Data indicate that both Listeria strains, after incubation with Na-Chl and following illumination (λ=400nm, 20mWcm(-2)), were inactivated by 7 log in vitro. This treatment cleaned both Listeria strains from packaging surfaces. Comparative analysis indicates that washing with water diminishes pathogens by less than 1 log, 200ppm Na-hypochlorite by 1.7 log, Na-Chl-based photosensitization by 4.5 log. Listeria biofilms were totally removed from the surface by photosensitization at higher photosensitizer concentrations and longer incubation times. In conclusion, both strains of L. monocytogenes can be effectively inactivated by photosensitization in vitro and on the surface of packaging. Listeria biofilms are susceptible to this treatment as well. Comparison of different surface decontamination treatments reveals that photosensitization is much more effective against both Listeria strains than washing with water or 200ppm Na-hypochlorite. Our data support the idea that Na-Chl-based photosensitization is an effective antimicrobial tool which may serve in the future for the development of human and environmentally friendly surface decontamination techniques.

• Authors: Zivile Luksiene, Irina Buchovec, Egle Paskeviciute
• Journal: Journal of photochemistry and photobiology. B, Biology (J Photochem Photobiol B) Vol. 101 Issue 3 Pg. 326-31 (Dec 02 2010) ISSN: 1873-2682 [Electronic] Switzerland
• PMID: 20801669 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Published by Elsevier B.V.

Chemical References

• Chlorophyllides
• Photosensitizing Agents
• Sodium Hypochlorite
• chlorophyllin

Topics

• Biofilms (drug effects, growth & development)
• Chlorophyllides (pharmacology)
• Decontamination
• Food Microbiology
• Food Packaging
• Light
• Listeria monocytogenes (drug effects, growth & development)
• Photosensitizing Agents (pharmacology)
• Sodium Hypochlorite (pharmacology)