Synergistic anti-bacterial activity of imidazole-based azo dyes with polyvinylpyrrolidone-coated silver nanoparticles / Ana Isabel Ribeiro in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 719-727 Titre : Synergistic anti-bacterial activity of imidazole-based azo dyes with polyvinylpyrrolidone-coated silver nanoparticles Type de document : texte imprimé Auteurs : Ana Isabel Ribeiro, Auteur ; Daniela Dantas, Auteur ; Luís Filipe Carvalho, Auteur ; Jorge Padrao, Auteur ; Renata Silva, Auteur ; Fernando Remiao, Auteur ; Eugénia Pinto, Auteur ; Fàtima Cerqueira, Auteur ; Alice Maria Dias, Auteur ; Andrea Zille, Auteur Année de publication : 2024 Article en page(s) : p. 719-727 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Argent Caractérisation Colorants azoïques Evaluation Imidazole L'imidazole (2 tautomères, 1H et 3H) est un composé organique aromatique hétérocyclique. C'est un cycle à cinq atomes contenant trois atomes de carbone et deux atomes d'azote en position 1 et 3. Le doublet électronique libre de l'azote 3 n'entre pas dans l'aromaticité car l'orbitale p est déjà utilisée pour faire une liaison π (donc son doublet est dans une orbitale moléculaire sp2), alors que celui de l'azote 1 y est inclus : il s'hybride sp2 et place son doublet dans une orbitale p pure afin de participer au phénomène de conjugaison. Nanoparticules Polyvinylpyrrolidone Synergie Textiles et tissus Index. décimale : 667.3 Teinture et impression des tissus Résumé : The high demand for novel antimicrobial textiles by the medical, healthcare, hygiene, sportswear, personal protective equipment and filtration sectors has promoted the growth of functional textiles. However, the efficacy of antimicrobial agents against different pathogens is a considerable challenge because of the distinctive mechanisms of action and resistance. The development of novel synergistic antimicrobial dyes may offer numerous opportunities to enhance antimicrobial effectiveness. In this work, a novel imidazole-based azo dye with a p-methoxyphenyl group in the N-1 substituent of the imidazole ring (AzoIz-a), and corresponding amidrazone precursor (AmIz-a), were combined with polyvinylpyrrolidone-coated silver nanoparticles (AgNPs). The molecules, alone and combined with the AgNPs, were characterised by ultraviolet-visible spectrophotometry and zeta potential. Their synergistic effect was assessed against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. The results were compared with a previously reported imidazole-based azo dye and precursor containing a methyl group in the imidazole ring (AmIz-b and AzoIz-b). The results showed interesting antimicrobial properties of the novel AzoIz-a molecules when combined with a very small concentration of AgNPs. The combination showed an additive effect for S. aureus and a synergistic effect for E. coli and P. aeruginosa. Considering the synergistic results, the effective concentration of the AzoIz-a decreased from more than 128 to 16-32 μg.mL−1 by the addition of a small concentration of AgNPs (0.6-1.3 μg.mL−1), which displayed comparable results with the AzoIz-b molecule. Thus, the application of these conjugates in textiles may lead to highly coloured materials with remarkable anti-bacterial properties, which warrant further exploration. Note de contenu : - Materials - Synthesis of the AmIz compounds - Synthesis of the AzoIz compounds (AzoIz-a and AzoIz-b) - AgNPs' redispersion, and preparation of the dispersions containing the AgNPs and the AmIz or AzoIz compounds - Characterisation of the molecules or AgNPs alone and respective combinations - Antimicrobial evaluation and synergism testing DOI : https://doi.org/10.1111/cote.12732 En ligne : https://drive.google.com/file/d/1Bp026vQsh9sbDYNvpYkqvIbu7vcmcNgw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41469 [article]

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