A series of 13 salicylamide derivatives was assessed for antibacterial activity against three isolates of vancomycin-resistant Enterococcus faecalis (VRE) and Enterococcus faecalis ATCC 29212 as a quality standard. The minimum inhibitory concentration was determined by the broth microdilution method with subsequent subcultivation of aliquots to assess minimum bactericidal concentration. The growth kinetics was established by the time-kill assay. Ampicillin, ciprofloxacin, tetracycline and vancomycin were used as the reference antibacterial drugs. Three of the investigated compounds showed strong bacteriostatic activity against VRE (0.199-25 µM) comparable to or more potent than ampicillin and ciprofloxacin. In addition, these compounds were tested for synergistic effect with vancomycin, ciprofloxacin and tetracycline, while 5-chloro-2-hydroxy-N-[4-(trifluoromethyl)phenyl]benzamide showed the highest potency as well as synergistic activity with vancomycin against VRE 368. Screening of the cytotoxicity of the most effective compounds was performed using human monocytic leukemia THP-1 cells, and based on LD50 values, it can be stated that the compounds have insignificant toxicity against human cells.

Department of Human Pharmacology and Toxicology Faculty of Pharmacy University of Veterinary and Pharmaceutical Sciences Palackeho 1 612 42 Brno Czech Republic

Department of Infectious Diseases and Microbiology Faculty of Veterinary Medicine University of Veterinary and Pharmaceutical Sciences Palackeho 1 612 42 Brno Czech Republic

Department of Inorganic and Organic Chemistry Faculty of Pharmacy Charles University Heyrovskeho 1203 500 05 Hradec Kralove Czech Republic

Department of Pharmaceutical Chemistry Faculty of Pharmacy Comenius University Odbojarov 10 832 32 Bratislava Slovakia

Department of Pharmaceutical Chemistry Faculty of Pharmacy Comenius University Odbojarov 10 832 32 Bratislava Slovakia; Department of Infectious Diseases and Microbiology Faculty of Veterinary Medicine University of Veterinary and Pharmaceutical Sciences Palackeho 1 612 42 Brno Czech Republic

Institute of Organic Chemistry and Technology Faculty of Chemical Technology University of Pardubice Studentska 573 532 10 Pardubice Czech Republic

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