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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Silver(I) and gold(I) complexes with sulfasalazine: Spectroscopic characterization, theoretical studies and antiproliferative activities over Gram-positive and Gram-negative bacterial strains

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Fiori-Duarte, Ana Thereza [1, 2] ; de Paiva, Raphael Enoque F. [3] ; Manzano, Carlos M. [1] ; Lustri, Wilton R. [4] ; Corbi, Pedro P. [1]
Total Authors: 5
[1] Univ Campinas UNICAMP, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
[2] Univ Campinas UNICAMP, Fac Pharmaceut Sci, BR-13083871 Campinas, SP - Brazil
[3] Univ Sao Paulo, Inst Chem, BR-05508000 Sao Paulo, SP - Brazil
[4] Dept Univ Araraquara UNIARA, Biol & Hlth Sci Dept Pharm Practice, BR-14801320 Araraquara, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Molecular Structure; v. 1214, AUG 15 2020.
Web of Science Citations: 0

The emergence of bacterial strains resistant to antibiotics, such as the sulfonamides (sulfa drugs), is currently a case of concern. The synthesis of metal complexes using well-known antibacterial agents and bioactive metals has proven to be an excellent strategy in the development of new and more active metallodrugs. Herein, we report the synthesis, structural characterization and antibacterial analysis of new gold(I) and silver(I) complexes with the sulfa drug sulfasalazine (ssz). Elemental, thermal and high-resolution mass spectrometric measurements indicated a 1:1:1 Au/ssz/Ph3P molar composition for the gold(I) complex (Ph3P - triphenylphosphine), while for the silver(I) complex the molar composition was 1:1 Ag/ssz. Solution state NMR and infrared spectroscopic data suggest that ssz coordinates to silver(I) and gold(I) by the oxygen atoms of the deprotonated carboxylic group. The coordination mode of the carboxylate was supported by density functional theory (DFT) calculations, which reinforces a monodentate coordination for the gold(I) complex and a bridged bidentate mode for the silver(I) one, with the molecular formulas {[}(Ph3P)Au(ssz)] and {[}Ag(ssz)](2), respectively. Antibacterial activity assays indicated the sensitivity of Gram-positive (Staphylococcus aureus and Bacillus cereus) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacterial strains to {[}Ag(ssz)](2) and {[}(Ph3P)Au(ssz)] complexes, while the free ligand was not able to inhibit the growth of any tested bacteria. The non-interaction of the complexes with deoxyribonucleic acid (DNA) was also demonstrated, which suggests that this biomolecule is not a preferential target for the compounds. (C) 2020 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 18/12062-4 - Synthesis, characterization and studies of interaction with biomolecules of metal complexes containing biologically active ligands: a strategy in the preparation of new agents with antibacterial and antiviral activities
Grantee:Pedro Paulo Corbi
Support type: Regular Research Grants
FAPESP's process: 18/12590-0 - Synthesis of metal complexes with bioactive N,N or N,O-coordinating ligands for use in sustainable delivery system based on bacterial cellulose
Grantee:Wilton Rogério Lustri
Support type: Regular Research Grants
FAPESP's process: 17/25995-6 - New Ag(I), Pd(II) and Pt(II) metal complexes with ligands used for the treatment of Tuberculosis: synthesis and in vitro evaluation of antimicrobial and antiproliferative activities
Grantee:Carlos Marrote Manzano
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 15/09833-0 - Sustainable delivery system based on biocellulose/metallic complexes containing bioactive ligands
Grantee:Wilton Rogério Lustri
Support type: Regular Research Grants