High-intensity 405 nm light inactivation of Listeria monocytogenes

Photochemistry and Photobiology
Endarko EndarkoJohn G Anderson

Abstract

The antimicrobial properties of light is an area of increasing interest. This study investigates the sensitivity of the significant foodborne pathogen Listeria monocytogenes to selected wavelengths of visible light. Results demonstrate that exposure to wavelength region 400-450 nm, at sufficiently high dose levels (750 J cm(-2)), induced complete inactivation of a 5 log(10) population. Exposure to wavelengths longer than 450 nm did not cause significant inactivation. Analysis of 10 nm bandwidths between 400 and 450 nm confirmed 405(± 5) nm light to be most effective for the inactivation of L. monocytogenes, with a lesser bactericidal effect also evident at other wavelengths between 400 and 440 nm. Identification of the optimum bactericidal wavelength enabled the comparison of inactivation using 405(± 5) nm filtered light and a 405 nm light-emitting diode (LED) array (14 nm FWHM). Results demonstrate similar inactivation kinetics, indicating that the applied dose of 405 nm light is the important factor. Use of the 405 nm LED array for the inactivation of L. monocytogenes and other Listeria species resulted in similar kinetics, with up to 5 log(10) reductions with a dose of 185 J cm(-2). Comparative data for the 405 nm light inac...Continue Reading

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Citations

Aug 20, 2015·Photochemistry and Photobiology·María T Lafuente, Fernando Alférez
Sep 23, 2014·Letters in Applied Microbiology·K ImadaS Ito
Jan 27, 2015·Journal of Photochemistry and Photobiology. B, Biology·Ji-Yuan LiangLiang-Yü Chen
Dec 23, 2016·Applied and Environmental Microbiology·Min-Jeong Kim, Hyun-Gyun Yuk
Sep 8, 2019·Applied and Environmental Microbiology·Kristin Sæbø PettersenMarina Aspholm
Sep 27, 2019·Photochemistry and Photobiology·Katharina HoenesMartin Hessling
Dec 28, 2017·Letters in Applied Microbiology·K NicAogáinC P O'Byrne
Mar 15, 2020·Applied and Environmental Microbiology·Yanpeng YangChao Shi
Feb 20, 2018·Frontiers in Microbiology·Peter J Gwynne, Maurice P Gallagher
Oct 1, 2020·Biochemical and Biophysical Research Communications·Martin HesslingKatharina Hönes

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