Influence of light intensity and irradiation mode on Methylene blue, Chlorin-e6 and Curcumin-Mediated Photodynamic Therapy against Enterococcus faecalis

Photodiagnosis and Photodynamic Therapy
Laís Simões SampaioCarla Raquel Fontana

Abstract

This study aimed to evaluate the effect of the continuous irradiation with low intensity (continuous mode) and fractioned irradiation with high intensity (fractionated mode), keeping the same dose of light by using Light Emitting Diode (LEDs) with wavelength emission centered at 450 and at 660 nm, using methylene blue (MB), chlorin-e6 (Ce6) and curcumin (CUR) as photosensitizers (PSs) against planktonic phase of E. faecalis. Cell viability was assessed by counting colonies forming per mL (CFU/mL), and the quantification of reactive species was performed by fluorescence with the photodegradation rate evaluated by measurements of absorbance of PSs at different times. The results revealed that MB-mediated PDT was efficient to achieve total microbial load reduction in both irradiation modes, but in fractional mode it was possible to use a lower light dose. Using Ce6, a total bacterial reduction was observed when fractional light was used, but at the same light dose, there was no reduction in the continuous irradiation mode. CUR-mediated PDT under continuous irradiation mode promoted the total microbial load reduction. However, for fractional mode, a higher concentration of CUR was required to completely reduce E. faecalis cell viab...Continue Reading

Citations

Jul 29, 2021·Photodiagnosis and Photodynamic Therapy·Daniela Alejandra Cusicanqui MéndezThiago Cruvinel

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