8-Hydroxyquinoline exerted highly potent antibacterial activity (Gram positive).
Nitroxoline exhibited strong antibacterial activity against Pseudomonas aeruginosa.
Cloxyquin displayed a high growth inhibition against Listeria monocytogenes and Plesiomonas shigelloides.
5-Amino-8-hydroxyquinoline exerted the most potent antioxidant activity (IC50=8.70 μM).
Nitroxoline and cloxyquin had a relatively high selectivity index.