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High-intensity narrow-spectrum light inactivation and wavelength sensitivity of Staphylococcus aureus

MacLean, Michelle and MacGregor, S.J. and Anderson, J.G. and Woolsey, G. (2008) High-intensity narrow-spectrum light inactivation and wavelength sensitivity of Staphylococcus aureus. FEMS Microbiology Letters, 285 (2). pp. 227-232. ISSN 0378-1097

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Abstract

This study was conducted to investigate the bactericidal effects of visible light on methicillin-sensitive and methicillin-resistant Staphylococcus aureus (MRSA), and subsequently identify the wavelength sensitivity of S. aureus, in order to establish the wavelengths inducing maximum inactivation. Staphylococcus aureus, including MRSA strains, were shown to be inactivated by exposure to high-intensity visible light, and, more specifically, through a series of studies using a xenon broadband white-light source in conjunction with a selection of optical filters, it was found that inactivation of S. aureus occurs upon exposure to blue light of wavelengths between 400 and 420 nm, with maximum inactivation occurring at 405 +/- 5 nm. This visible-light inactivation was achieved without the addition of exogenous photosensitisers. The significant safety benefit of these blue-light wavelengths over UV light, in addition to their ability to inactivate medically important microorganisms such as MRSA, emphasises the potential of exploiting these non-UV wavelengths for disinfection applications.

Item type: Article
ID code: 15020
Keywords: photodynamic inactivation, visible light, Staphylococcus aureus, wavelength sensitivity, Electrical engineering. Electronics Nuclear engineering, Microbiology, Electrical and Electronic Engineering, Microbiology
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Science > Microbiology
Department: Faculty of Engineering > Electronic and Electrical Engineering
Depositing user: Strathprints Administrator
Date deposited: 22 Jun 2010 15:02
Last modified: 15 Mar 2019 03:10
Related URLs:
URI: https://strathprints.strath.ac.uk/id/eprint/15020
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