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Household light source for potent photo-dynamic antimicrobial effect and wound healing in an infective animal model.
Biomedical Optics Express 2018 March 2
Photodynamic antimicrobial chemotherapy (PACT) is considered a promising alternative to conventional antibiotic approach. We have previously developed a novel PS containing five lysine amino acids, pentalysine-β-carbonylphthalocyanine Zinc (ZnPc(Lys)5 ), which in the presence of light, is highly toxic against a range of bacterial strains, including hospital isolated, drug resistant Acinetobacter baumannii. Here, we study the effect of light fluence of the two light sources on the PACT potency of ZnPc(Lys)5 . We observed that an exposure of E.coli to a red LED light for only 2 seconds (light fluence of 0.15 J/cm2 ) in the presence of ZnPc(Lys)5 significantly eradicated 80% of the E.coli . We further demonstrated that a light fluence of 4.5 J/cm2 from a household light source induced a noticeable photodynamic effect in vitro and in vivo animal model. This study points to a new research direction of reducing light illumination time by increasing potency of PS.
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