Light-Harvesting Antenna and Proton-Activated Photodynamic Effect of a Novel BODIPY-Fullerene C 60 Dyad as Potential Antimicrobial Agent

A covalently linked BODIPY-fullerene C dyad (BDP-C ) was synthesized as a two-segment structure, which consists of a visible light-harvesting antenna attached to an energy or electron acceptor moiety. This structure was designed to improve the photodynamic action of fullerene C to inactivate bacteri...

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Veröffentlicht in:Chemphyschem 2019-05, Vol.20 (9), p.1110-1125
Hauptverfasser: Agazzi, Maximiliano L, Durantini, Javier E, Gsponer, Natalia S, Durantini, Andrés M, Bertolotti, Sonia G, Durantini, Edgardo N
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Sprache:eng
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Zusammenfassung:A covalently linked BODIPY-fullerene C dyad (BDP-C ) was synthesized as a two-segment structure, which consists of a visible light-harvesting antenna attached to an energy or electron acceptor moiety. This structure was designed to improve the photodynamic action of fullerene C to inactivate bacteria. The absorption spectrum of BDP-C was found to be a superposition of the spectra of its constitutional moieties, whereas the fluorescence emission of the BODIPY unit was strongly quenched by the fullerene C . Spectroscopic, calculations, and redox studies indicate a competence between photoinduced energy and electron transfer. Protonating the dimethylaminophenyl substituent through addition of an acidic medium led to a substantial increase in the fluorescence emission, triplet excited state formation, and singlet molecular oxygen production. At physiological pH, photosensitized inactivation of Staphylococcus aureus mediated by 1 μM BDP-C exhibited a 4.5 log decrease of cell survival (>99.997 %) after 15 min irradiation. A similar result was obtained with Escherichia coli using 30 min irradiation. Moreover, proton-activated photodynamic action of BDP-C turned this dyad into a highly effective photosensitizer to eradicate E. coli. Therefore, BDP-C is an interesting photosensitizing structure in which the light-harvesting antenna effect of the BODIPY unit combined with the protonation of dimethylaminophenyl group can be used to improve the photoinactivation of bacteria.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201900181