We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Red and infrared laser therapy inhibits in vitro growth of major bacterial species that commonly colonize skin ulcers.
- Authors
Sousa, Natanael; Gomes, Rosana; Santos, Marcos; Brandino, Hugo; Martinez, Roberto; Jesus Guirro, Rinaldo; de Sousa, Natanael Teixeira Alves; Gomes, Rosana Caetano; Santos, Marcos Ferracioli; Brandino, Hugo Evangelista; de Jesus Guirro, Rinaldo Roberto
- Abstract
Low-level laser therapy (LLLT) is used in chronic wounds due to its healing effects. However, bacterial species may colonize these wounds and the optimal parameters for effective bacterial inhibition are not clear. The aim of this study was to analyze the effect of LLLT on bacterial growth in vitro. Bacterial strains including Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa were suspended in saline solution at a concentration of 10(3) cells/ml and exposed to laser irradiation at wavelengths of 660, 830, and 904 nm at fluences of 0 (control), 3, 6, 12, 18, and 24 J/cm(2). An aliquot of the irradiated suspension was spread on the surface of petri plates and incubated at 37 °C for quantification of colony-forming unit after 24, 48, and 72 h. Laser irradiation inhibited the growth of S. aureus at all wavelengths and fluences higher than 12 J/cm(2), showing a strong correlation between increase in fluence and bacterial inhibition. However, for P. aeruginosa, LLLT inhibited growth at all wavelengths only at a fluence of 24 J/cm(2). E. coli had similar growth inhibition at a wavelength of 830 nm at fluences of 3, 6, 12, and 24 J/cm(2). At wavelengths of 660 and 904 nm, growth inhibition was only observed at fluences of 12 and 18 J/cm(2), respectively. LLLT inhibited bacterial growth at all wavelengths, for a maximum of 72 h after irradiation, indicating a correlation between bacterial species, fluence, and wavelength.
- Subjects
INFRARED radiation; LASER beams; SKIN ulcers; STAPHYLOCOCCUS aureus; WOUND healing; ESCHERICHIA coli physiology; PSEUDOMONAS physiology; ESCHERICHIA coli; NONIONIZING radiation; PSEUDOMONAS; PHYSIOLOGY
- Publication
Lasers in Medical Science, 2016, Vol 31, Issue 3, p549
- ISSN
0268-8921
- Publication type
journal article
- DOI
10.1007/s10103-016-1907-x