Abstract
Bacterial multidrug resistance (MDR) constitutes a major hurdle in the treatment of infectious diseases worldwide. The present study was designed to evaluate the antibacterial activities of synthetic p-toluenesulfonyl-hydrazinothiazoles against multidrug resistant Gram-negative bacteria. The broth microdilution method was used to determine the minimal inhibitory concentrations (MIC). The results demonstrated that the best activities were obtained with hydrazinoselenazoles. p-Chloro-benzyliden-selenosemicarbazide, 4-methyl-2-[(4-chloro-benzyliden)-hydrazinyl]-1,3-selenazole, p-chloro-benzoyl-selenosemicarbazide and 4-chloromethyl-2-[(4-chlorobenziliden)-N-acetyl-hydrazinyl]-1,3-selenazole were more active than the choramphenicol on Klebsiella pneumoniae KP63. Tested alone, the lowest MIC value of 16 mg/L was obtained with p-methoxy-benzyliden-selenosemicarbazide against Enterobacter aerogenes ATCC13048, K. pneumoniae ATCC112296 and KP55. Tested in the presence of an efflux pump inhibitor, phenylalanine arginine β-naphthylamide (PAβN), the activity of p-chloro-benzyliden-selenosemicarbazide, 4-methyl-2-[(4-chloro-benzyliden)-hydrazinyl]-1,3-selenazole, p-chloro-benzoyl-selenosemicarbazide and p-methoxy-benzyliden-selenosemicarbaz...Continue Reading
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