Synthesis,characterization, and bactericidal properties of composites based on crosslinked resins containing silver |
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Authors: | Luiz Claudio de Santa Maria Jacqueline D. C. Souza Mônica R. M. P. Aguiar Shu H. Wang José L. Mazzei Israel Felzenszwalb Sandro C. Amico |
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Affiliation: | 1. Instituto de Química, Universidade do Estado do Rio de Janeiro, Rua S?o Francisco Xavier 524, Rio de Janeiro/RJ, 20550‐900 Brazil;2. Departamento de Engenharia Metalúrgica e de Materiais, Escola Politécnica, Universidade de S?o Paulo, Avenida Professor Mello Moraes 2463, S?o Paulo/SP, 05508‐900 Brazil;3. Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Avenida 28 de Setembro 87 fds, 4 Andar, Rio de Janeiro/RJ, 20551‐030 Brazil;4. Departamento de Materiais, Universidade Federal do Rio Grande do Sul, Laboratoório de Materiais Polimeóricos/ Departamento de Engenharia dos Materiais (LAPOL/DEMAT), Campus Vale, Setor IV, Prédio 74, Sala 119, Porto Alegre/RS, 91501‐970 Brazil |
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Abstract: | Two different commercial crosslinked resins (Amberlite GT73 and Amberlite IRC748) were employed for anchoring silver. The ? SH and ? N(CH2COOH)2 groups, respectively, present on these resins were used for Ag+ chelation from an aqueous solution. The Ag+ ions were reduced with three different reductants: hydrazine, hydroxylamine, and formaldehyde (under an alkaline pH). The produced composites were characterized with thermogravimetry/differential thermogravimetry and scanning electron microscopy combined with a backscattered scanning electron detector. Energy‐dispersive X‐ray spectroscopy coupled to scanning electron microscopy allowed the observation of submicrometer particles of silver, and chemical microanalysis of emitted X‐rays revealed the presence of metal on the internal and external surfaces of the composite microspheres. The amount of incorporated silver was determined by titration. The antibacterial activity of the silver/resin composites was determined toward 103–107 cells/mL dilutions of the auxotrophic AB1157 Escherichia coli strain; the networks containing anchored submicrometer silver particles were completely bactericidal within a few minutes because of the combined action of silver and functional groups of the resins. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 |
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Keywords: | biomaterials composites synthesis |
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