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The bactericidal efficacy of femtosecond laser-based therapy on the most common infectious bacterial pathogens in chronic wounds: an in vitro study

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Abstract

We investigated the influence of femtosecond laser irradiation on the growth of the two most common infectious bacterial pathogens in wounds; Staphylococcus aureus and Pseudomonas aeruginosa as an attempt to validate optimum parameters for a laser-based bactericidal modality to be used clinically. Bacterial cultures were exposed to femtosecond laser irradiation at different wavelengths, exposure times, and laser powers. The source of femtosecond laser was INSPIRE HF100 laser system, Spectra-Physics, which is pumped by a mode-locked femtosecond Ti: sapphire laser MAI TAI HP, Spectra-Physics. After irradiation, bacterial cells’ survival was monitored by observing the clear zones of inhibition in cultured agar plates. Results for all strains indicated that the exposure to femtosecond laser irradiation with a wavelength ranging from ultraviolet (λ > 350 nm) to blue laser light (λ < 480 nm), for a period above 20 min and with a power density of ≈ 0.063 W/cm2, was enough to inhibit both bacterial pathogens with the results maintained for 1 week following irradiation.

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Authors and Affiliations

  1. Laser Institute for Research and Applications LIRA, Beni-Suef University, Beni-Suef, 62511, Egypt

    Esraa Ahmed, Ahmed O. El-Gendy & Tarek Mohamed

  2. Faculty of Pharmacy, Department of Microbiology and Immunology, Beni-Suef University, Beni-Suef, 62514, Egypt

    Ahmed O. El-Gendy

  3. Faculty of Medicine, Department of Microbiology and Immunology, Beni-Suef University, Beni-Suef, 62514, Egypt

    Naglaa A. Moniem Radi

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  1. Esraa Ahmed
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  2. Ahmed O. El-Gendy
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Correspondence to Tarek Mohamed.

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Ahmed, E., El-Gendy, A.O., Moniem Radi, N.A. et al. The bactericidal efficacy of femtosecond laser-based therapy on the most common infectious bacterial pathogens in chronic wounds: an in vitro study. Lasers Med Sci 36, 641–647 (2021). https://doi.org/10.1007/s10103-020-03104-0

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  • DOI: https://doi.org/10.1007/s10103-020-03104-0

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