Preparação e avaliação de resinas biocidas impregnadas com iodo a partir de resinas comerciais de estireno e divinilbenzeno

• Autor(a) principal: Araujo, Renata Bastos de
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/15757
• topic: Iodine; Divinylbenzene copolymer; Resins; Bactericidal activity; Escherichia coli; Iodo; Copolímero de divinilbenzeno; Resinas; Atividade bactericida; Escherichia coli; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA

In this study, we employed two commercial resins strongly basic character. Both based on copolymers of styrene and divinylbenzene (DVB), and the VPOC 1950 contains in its composition quaternary ammonium groups of the type 1 (has three methyl groups) and VPOC 1960 quaternary ammonium groups of the type 2 (where a group ethanol replaces one of the methyl groups). The aforementioned commercial resins were chosen because they have a high ion exchange capacity, stability and functional groups of interest for impregnation with iodine. The resins were impregnated with iodine by three different methodologies, a methanol solution of 0.08 mol/L iodine with and without 0.14 mol/L potassium iodide and 0.08 mol/L iodine in heptane. The resins were characterized by surface area, pore volume, degree of swelling, optical microscopy, infrared spectroscopy by Fourier transform (FTIR), elemental analysis, thermogravimetry, scanning electron microscopy and determination of iodine prescribed by iodometry. The biocidal activity evaluation was performed by the method of plate counting, using a strain of Escherichia coli ATCC®11775 at concentrations 103-107 cells/ml. All resins impregnated showed significant bactericidal activity due to the presence of iodine correlated characteristics of the resin, such as functional groups, size and shape of the pores. For comparison, tests were performed with bactericidal resins departure for confirmation or not of bactericidal only be attributed to iodine.