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Microbial control of food-related surfaces: Na-Chlorophyllin-based photosensitization

Paper ID Volume ID Publish Year Pages File Format Full-Text
30775 44502 2011 6 PDF Available
Microbial control of food-related surfaces: Na-Chlorophyllin-based photosensitization

The aim of this study was to evaluate efficiency of photosensitization as surface sanitation alternative using model systems when food pathogens, their spores and biofilms were attached to the food-related surface (polyolefine). In addition it was important to compare antibacterial efficiency of Na-Chlorophyllin (Na-Chl)-based photosensitization with conventional sanitizers.Obtained results indicate that Bacilluscereus ATCC 12826 and Listeriamonocytogenes ATCC 7644 as well as their thermoresistant strains B.cereus SV90 and L.monocytogenes 56LY were effectively inactivated (7 log) by Na-Chl-based photosensitization invitro. Inactivation rate of thermoresistant strains was slower. The number of attached to the surface B.cereus ATCC 12826 and L.monocytogenes ATCC 7644 was reduced from 4–4.5 log to 0 log after photosensitization treatment. To achieve adequate inactivation of thermoresistant strains the higher Na-Chl concentration and longer illumination times had to be used. Comparison of different surface decontamination treatments reveal that photosensitization is much more effective against all surface-attached B.cereus and L.monocytogenes strains than washing with water or 200 ppm Na-hypochlorite. It is important to note, that surface-attached B.cereus spores and L.monocytogenes biofilms can be eliminated from it by photosensitization as well.Our data support the idea that Na-Chlorophyllin-based photosensitization has high antibacterial potential which may serve in the future for the development of human and environment friendly, non-thermal surface decontamination technique.

► Effective inactivation of L. monocytogenes, B. cereus by Chl-based photosensitization was found. ► Inactivation of thermoresistant strains needs longer irradiation time and higher Chl concentration. ► Photosensitization-based packaging decontamination is more effective that conventional treatments.

Photosensitization; Na-Chlorophyllin; Bacillus cereus; Listeria monocytogenes; Surface decontamination technology
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Microbial control of food-related surfaces: Na-Chlorophyllin-based photosensitization
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 105, Issue 1, 5 October 2011, Pages 69–74
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Physical Sciences and Engineering Chemical Engineering Bioengineering