科研之友
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摘要
Pseudomonas aeruginosa 谷 conhecida por sua versatilidade metab車lica e extrema capacidade de adapta o a diferentes ambientes, inclusive aqu芍ticos. Para desinfec o de 芍guas, o cloro e agentes que cont那m cloro continuam sendo os mais usados no mundo. O objetivo deste trabalho foi avaliar a resist那ncia ao cloro de linhagens de P. aeruginosa, isoladas de amostras de 芍guas de diversos ambientes. Foram testados diferentes tempos de contato (1, 5, 10, 20, 30 e 40 minutos) e solu es aquosas de cloro, com concentra es definidascom base na legisla o vigente no pa赤s para 芍gua pot芍vel: 0,5; 1,0 e 2,0 ppm. O teste de resist那ncia ao cloro foi desenvolvido por meio da exposi o direta das bact谷rias 角s solu es. Os resultados revelaram que P. aeruginosa, isoladas de diferentes fontes de 芍gua, t那m ahabilidade de sobreviver a diferentes concentra es de cloro. Na concentra o de 1 ppm, a maioria das linhagens n o foi inibida. As linhagens mais resistentes ao cloro tamb谷m apresentaram rela o de multirresist那ncia 角 maioria dos antibi車ticos testados. The nutritional versatility and the adaptability of Pseudomonas aeruginosa to different environments, including water, are well known. Chlorine and other chlorine agents are used as water disinfecting all around the world. The aim of this work was to evaluate the possible chlorine resistance amongst P. aeruginosa strains isolated from different aquatic sources by using different contact time (1, 5, 10, 20, 30 and 40 minutes) in solutions with known chlorine concentrations according current legislation in the country to potable water: 0.5; 1.0 and 2.0 ppm. The chlorine resistance test was done by direct exposure of P. aeruginosa under a solution with known chlorine concentration. Results showed that P. aeruginosa strains isolated from different aquatic sources are able tosurvive in different chlorine concentrations. At 1 ppm, most of them were not inhibited. It was also observed that the most resistant strains were antibiotic multiresistant.
