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- W2788045365 abstract "Abstract EDTA is widely used as an inhibitor of bacterial growth, affecting the uptake and control of metal ions by microorganisms. We describe the synthesis and characterisation of two symmetrical bis‐amide derivatives of EDTA , featuring glycyl or pyridyl substituents: AmGly 2 and AmPy 2 . Metal ion affinities (log K ) have been evaluated for a range of metals (Mg 2+ , Ca 2+ , Fe 3+ , Mn 2+ , Zn 2+ ), revealing less avid binding compared to EDTA . The solid‐state structures of AmGly 2 and of its Mg 2+ complex have been determined crystallographically. The latter shows an unusual 7‐coordinate, capped octahedral Mg 2+ centre. The antibacterial activities of the two ligands and of EDTA have been evaluated against a range of health‐relevant bacterial species, three Gram negative ( Escherichia coli , Pseudomonas aeruginosa and Klebsiella pneumoniae ) and a Gram positive ( Staphylococcus aureus ). The AmPy 2 ligand is the only one that displays a significant inhibitory effect against K. pneumoniae , but is less effective against the other organisms. AmGly 2 exhibits a more powerful inhibitory effect against E. coli at lower concentrations than EDTA (<3 m m ) or AmPy 2 , but loses its efficacy at higher concentrations. The growth inhibition of EDTA and AmGly 2 on mutant E. coli strains with defects in outer‐membrane lipopolysaccharide (LPS) structures has been assessed to provide insight into the unexpected behaviour. Taken together, the results contradict the assumption of a simple link between metal ion affinity and antimicrobial efficacy." @default.
- W2788045365 created "2018-03-06" @default.
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- W2788045365 date "2018-03-23" @default.
- W2788045365 modified "2023-10-18" @default.
- W2788045365 title "On the Antibacterial Activity of Azacarboxylate Ligands: Lowered Metal Ion Affinities for Bis-amide Derivatives of EDTA do not mean Reduced Activity" @default.
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- W2788045365 doi "https://doi.org/10.1002/chem.201800026" @default.
- W2788045365 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29570870" @default.
- W2788045365 hasPublicationYear "2018" @default.
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