Abstract
The effect of photodynamic inactivation (PDI) sensitized by 5,10,15,20-tetra(4-N,N,N-trimethylammoniophenyl)porphyrin (TMAP4+) on different components of mono- and dual-species biofilms of Staphylococcus aureus and Escherichia coli was determined by different methods. First, the plate count technique showed that TMAP4+-PDI was more effective on S. aureus than E. coli biofilm. However, crystal violet staining revealed no significant differences between before and after PDI biofilms of both bacteria. On the other hand, the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide method indicated a reduction in viable cells as the light exposure time increases in both, mono- and dual-species biofilms. Furthermore, it was determined that as the irradiation time increases, the amount of extracellular polymeric substances present in the biofilms decreased. This effect was presented in both strains and in the mixed biofilm, being more evident in S. aureus mono-specie biofilm. Finally, scanning electron microscopy analysis showed a decrease in the number of cells forming the biofilm after photosensitization treatments. This information makes it possible to determine whether the photodynamic action is based on damage to metabolic activity, extracellular matrix and/or biomass, which may be useful in establishing a fully effective PDI protocol for the treatment of microorganisms growing as biofilms.
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Acknowledgements
Authors are grateful to Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) of Argentina and Agencia Nacional de Promoción Científica y Tecnológica (FONCYT PICT N°1482/19 and 2391/19) for financial support. R.B.A. thanks CONICET for the research fellowship. E.N.D. and M.B.S. are Scientific Members of CONICET. Special thanks to D.F.B.P.
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Fondo para la Investigación Científica y Tecnológica, PICT N°1482/19, Mariana B. Spesia, PICT N° 2391/19, Edgardo N. Durantini.
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Acosta, R.B., Durantini, E.N. & Spesia, M.B. Evaluation of quantification methods to determine photodynamic action on mono- and dual-species bacterial biofilms. Photochem Photobiol Sci (2024). https://doi.org/10.1007/s43630-024-00586-7
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DOI: https://doi.org/10.1007/s43630-024-00586-7