title: Effects of bio-compatible metal ions on rufloxacin photochemistry, photophysics and photosensitization: copper(II).
abstract: The presence of copper(II) in the micromolar range modulates the photodegradation rate of the fluoroquinolone Rufloxacin (RFX), both under air and in nitrogen saturated aqueous solution. The photodegradation rate of RFX under aerobic conditions decreases in the presence of metal ions, and no change in the nature of the photoproducts is observed. In anaerobic media, RFX photodegradation rate increases with increasing copper(II) concentration and the photoproducts distribution changes. Copper(II) inhibits formation of type II products of 2'-deoxyguanosine diagnostic of photosensitization mediated by singlet oxygen. The overall results provide a clear example demonstrating how a bio-compatible trace element influences efficiently not only the bioavailability of a drug but also its molecular mechanism of photodegradation and photosensitization.
authors: Departamento de Quimica/Instituto de Tecnologia Quimica UPV-CSIC, Universidad Politecnica de Valencia, Valencia, Spain.
authors: Maria Consuelo
authors: MC
authors: Cuquerella
authors: Alessandra
authors: A
authors: Belvedere
authors: Alfio
authors: A
authors: Catalfo
authors: Miguel Angel
authors: MA
authors: Miranda
authors: J C
authors: JC
authors: Scaiano
authors: Guido
authors: G
authors: de Guidi
mesh_terms: D000388:Air; D000900:Anti-Bacterial Agents / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D003849:Deoxyguanosine / Q000737:chemistry; D024841:Fluoroquinolones / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D055668:Photochemical Processes; D010782:Photolysis; D017319:Photosensitizing Agents / Q000737:chemistry; D026082:Singlet Oxygen / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D024841:Fluoroquinolones; D017319:Photosensitizing Agents; D014867:Water; D026082:Singlet Oxygen; D003300:Copper; D003849:Deoxyguanosine; D009584:Nitrogen; C060328:rufloxacin