Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
Volume 92, Issue 2, Pages 83-90Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2008.05.001
Keywords
antibacterial; cinoxacin; nalidixic acid; photostability; photochemical activity; quinolone
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Funding
- CONICIT-Venezuela [S1-2502, S1-960011724]
- FONACIT [G-2005000447]
- German Embassy in Venezuela
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We have synthesized two naphthyl. ester quinolone derivates and determined their ability to generate reactive oxygen species (ROS) such as O-1(2), (OH)-O-center dot, H2O2 Upon photolysis with UV-A light. The ability of cinoxacin (1) and nalidixic acid (2), and their naphthyl ester derivatives (3 and 4) to generate a dose-dependent amount of singlet oxygen and ROS (O-center dot-(2), center dot-OH) in cell-free systems was detected by histidine assay and by luminol-enhanced chemiluminescence (LCL), respectively. Their electronic absorption and emission spectra were quantified and their photostability was determined. Their tendency to generate peroxidic derivative species showed the following order: 3 > 4; in contrast, their ability to genera e singlet oxygen was 4 > 3 and these were better sensitizers than their parent quinolones 1 and 2. The antibacterial activity in darkness and under irradiation of compounds 3 and 4 was tested on Escherichia coli and compared with that of their parent compounds. An enhanced antibacterial activity by irraciation of the naphthyl esters of cinoxacin and nalidixic acid on E. coli was observed. (c) 2008 Elsevier B.V. All rights reserved.
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