• Superoxide dismutase;
  • DNA;
  • Nucleolytic activity;
  • Fluoroquinolone;
  • Copper complexes;
  • Enrofloxacin


Five new copper(II) complexes of type [Cu(erx)(L)Cl] (erx, enrofloxacin; thiophene-2-carbaldehyde (L1); pyridine-2-carbaldehyde (L2); 2,2′-dipyridylamine (L3); 4,5-diazafluoren-9-one (L4); bis(3,5-dimethyl-1-pyrazolyl)methane (L5)) have been synthesized and characterized by elemental analysis, reflectance, IR, and FAB-MS. Complexes have been investigated for their interaction with calf thymus (CT) DNA utilizing the absorption-titration method, viscometric and DNA thermal denaturation studies. The cleavage reaction on pUC19 DNA has been monitored by agarose gel electrophoresis. The results indicated that the CuII complexes can more effectively promote the cleavage of plasmid DNA at physiological pH and superoxide dismutase. The (SOD) activity of the complexes has been evaluated by the nitroblue tetrazolium assay, and the complexes catalyzed the dismutation of superoxide at pH 7.8 with IC50 values of 0.35–1.25 μM. The complexes have also been screened for their antibacterial activity against five pathogenic bacteria.