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Erschienen in: Lasers in Dental Science 3/2020

10.07.2020 | Original Article

Bactericidal effects of in vitro 405 nm, 530 nm and 650 nm laser irradiation on methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa and Mycobacterium fortuitum

verfasst von: Aemen Ali Kudayr Al-Shammary, Noor Areefa Ardella Mohd Ma’amor, Shao Qin Chen, Kim Soon Lee, Khayriyyah Mohd Hanafiah

Erschienen in: Lasers in Dental Science | Ausgabe 3/2020

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Abstract

Purpose

Laser irradiation (LI) is an emerging antimicrobial strategy that may reduce public health reliance on antibiotics but previous studies reported results based on one wavelength-duration LI, typically on one bacterial species using solid culture. This study aimed to evaluate the effect of increasing duration of 405 nm, 532 nm and 650 nm LI on methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa and Mycobacterium fortuitum in liquid culture.

Methods

Bacterial cultures of 1000 CFU/ml irradiated with 405 nm, 532 nm and 650 nm (200 mW) laser at 1, 2, 5 and 10 min were subcultured on nutrient agar; colony counts pre/post-LI were recorded and survival calculated. Antimicrobial sensitivity and cell morphology pre/post-LI were compared using scanning electron microscopy (SEM) and disc diffusion, respectively.

Results

The 405 nm (blue) LI had the highest bactericidal effect (0–6% survival) on all test bacteria compared to 532 nm (green) (12–49% survival) and 650 nm (red) (33–94% survival) LI. An inverse relationship between LI duration and survival was observed, except in 650 nm LI of P. aeruginosa, whereby survival increased with increasing duration. No change in antibiotic sensitivity was observed for subcultured bacterial colonies post-10 min LI. Although SEM micrographs of bacteria 10 minutes post-405 nm LI showed appreciable cell morphological changes, no significant cellular damage was observed.

Conclusion

These encouraging results confirm bactericidal effects of 405 nm LI on bacteria such as P. aeruginosa and further expand findings on 532 nm and 650 nm LI on bacterial survival, highlighting the potential of LI as novel antimicrobial strategies on opportunistic pathogens such as MRSA, P. aeruginosa and M. fortuitum.
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Metadaten
Titel
Bactericidal effects of in vitro 405 nm, 530 nm and 650 nm laser irradiation on methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa and Mycobacterium fortuitum
verfasst von
Aemen Ali Kudayr Al-Shammary
Noor Areefa Ardella Mohd Ma’amor
Shao Qin Chen
Kim Soon Lee
Khayriyyah Mohd Hanafiah
Publikationsdatum
10.07.2020
Verlag
Springer International Publishing
Erschienen in
Lasers in Dental Science / Ausgabe 3/2020
Elektronische ISSN: 2367-2587
DOI
https://doi.org/10.1007/s41547-020-00097-5

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