Abstract
Derivatives of 1,4-dihydro-4-oxoquinoline substituted at 4-pyridone or/and benzene moieties were synthesized ( Q1– Q17), and characterized by UV/vis and FT-IR spectroscopy. In dimethylsulfoxide and acetonitrile solvents a significant influence of the substituent's character and position on the quinolone skeleton was observed on the absorption bands in the UVA region (315–400 nm). Electron-withdrawing substituents (nitro, cyano, acetyl or trifluoroacetyl) caused a red shift, resulting in the effective absorption of UVA light. Photoinduced generation of superoxide radical anion and singlet oxygen upon UVA irradiation was followed by EPR spectroscopy using in situ spin trapping technique; 4-hydroxy-2,2,6,6-piperidine (TMP) served for singlet oxygen ( 1O 2) detection. An efficient generation of superoxide radical anions and singlet oxygen was observed predominantly for nitro-substituted quinolones. The effect of quinolones on proliferation of HL-60 cells was monitored, and the values of IC 50 evidenced the highest inhibition in the presence of ethyl 1,4-dihydro-6-fluoro-8-nitro-4-oxoquinoline-3-carboxylate ( Q17) and ethyl 1,4-dihydro-8-nitro-4-oxoquinoline-3-carboxylate ( Q5).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
