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Abstract Title:

Synthesis, characterization, and antimicrobial activity of silver carbene complexes derived from 4,5,6,7-tetrachlorobenzimidazole against antibiotic resistant bacteria.

Abstract Source:

Dalton Trans. 2012 Jun 7 ;41(21):6500-6. Epub 2012 Mar 8. PMID: 22402409

Abstract Author(s):

Brian D Wright, Parth N Shah, Lucas J McDonald, Michael L Shaeffer, Patrick O Wagers, Matthew J Panzner, Justin Smolen, Jasur Tagaev, Claire A Tessier, Carolyn L Cannon, Wiley J Youngs

Article Affiliation:

Center for Silver Therapeutics Research, Department of Chemistry, The University of Akron, Akron, OH 44325-3601, USA. youngs@uakron.edu.

Abstract:

Silver N-heterocyclic carbene complexes have been shown to have great potential as antimicrobial agents, affecting a wide spectrum of both Gram-positive and Gram-negative bacteria. A new series of three silver carbene complexes (SCCs) based on 4,5,6,7-tetrachlorobenzimidazole has been synthesized, characterized, and tested against a panel of clinical strains of bacteria. The imidazolium salts and their precursors were characterized by elemental analysis, mass spectrometry, (1)H and (13)C NMR spectroscopy, and single crystal X-ray diffraction. The silver carbene complexes, SCC32, SCC33, and SCC34 were characterized by elemental analysis, (1)H and (13)C NMR spectroscopy, and single crystal X-ray diffraction. These complexes proved highly efficacious with minimum inhibitory concentrations (MICs) ranging from 0.25 to 6μg mL(-1). Overall, the complexes were effective against highly resistant bacteria strains, such as methicillin-resistant Staphylococcus aureus (MRSA), weaponizable bacteria, such as Yersinia pestis, and pathogens found within the lungs of cystic fibrosis patients, such as Pseudomonas aeruginosa, Alcaligenes xylosoxidans, and Burkholderia gladioli. SCC33 and SCC34 also showed clinically relevant activity against a silver-resistant strain of Escherichia coli based on MIC testing.

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Sayer Ji
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