Abstract
Abstract This article reports the evaluation of the antimicrobial activity of a silver composite based on sulfonic resin. The antimicrobial action of the composite was evaluated against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus through plate, batch and colunm experiments. In batch studies, the efficiency of the composite was evaluated as a function of composite mass, bacterial concentration and contact time. We also developed a method to evaluate the antimicrobial activity of this composite using column tests. The antimicrobial activity of the composite was similar against the three bacteria in halo inhibition and batch experiments. The antibacterial activity was 100% against all bacteria above 0.20 g of composite and for all concentrations of bacteria studied. Column studies showed that the composite (1 g) had 100% action against 48 cm3 of S. aureus and 55 cm3 of E. coli and P. aeruginosa suspensions (105 cells mL-1, 50 cm3 min-1).
Highlights
Among the various antimicrobial materials are nanomaterials, or impregnation of the antibacterial agent in the polymeric antimicrobial peptides and antimicrobial polymers[1]. matrix[3]
The silver composite was prepared by treatment of Lewatit VPOC1800 sulfonic resin with AgNO3 followed by reduction reaction with hydroxylamine chloride
These results agree with other results of thermal decomposition of nanocomposites, demonstrating that the impregnation of metal particles improves the thermal resistance of the polymeric support[15]
Summary
Among the various antimicrobial materials are nanomaterials, or impregnation of the antibacterial agent in the polymeric antimicrobial peptides and antimicrobial polymers[1]. matrix[3]. Antimicrobial polymers have been extensively evaluated are crosslinked beads made of divinylbenzene (DVB), for disinfection of water[2,3,4]. They have many advantages and the biocidal groups studied are mainly ammonium and over low molecular weight biocidal compounds, mainly phosphonium quaternary groups[3,17,19,22], charge transfer greater stability with respect to volatilization, dissolution complexes involving iodine and quaternary ammonium and diffusion to the environment[3,5]. A water pretreatment step with other effects, the Ag+ ions bind to thiol groups in essential an antimicrobial polymer before traditional membrane proteins, provoking structural changes in the cell wall treatment can reduce the formation of biofilms, that can cause death. The introduction of silver particles increasing the lifetimes of these membranes
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