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Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

Sub-lethal photodynamic inactivation renders Staphylococcus aureus susceptible to silver nanoparticles.


PMID 23715073

Abstract

Staphylococcus aureus is a common etiological factor in infections of burns and other chronic wounds. The development of an effective and fast-acting treatment would be enormously beneficial and is highly desired. We focused on testing the bactericidal efficacy of photoinactivation using a known photosensitizer (protoporphyrin IX, PPIX) in sequential combination with silver nanoparticles against S. aureus. Using PPIX-based photoinactivation followed by silver nanoparticles we obtained a high bactericidal effect (7 log10 units reduction) with limited harmful effects on human epidermal keratinocytes. Moreover, we observed that the use of silver nanoparticles prevents bacterial re-growth 24 h post-PDI treatment. A sequential combination of photoinactivation and silver nanoparticles represents a potentially effective antibacterial approach.

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258385
Protoporphyrin IX disodium salt, ≥90% (HPLC)
C34H32N4Na2O4