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Disinfection of water of remove Legionella species: evaluation of an antimicrobial ceramic

机译：去除军团菌物种的水的消毒：抗菌陶瓷的评估

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To evaluate the efficacy of an antimicrobial ceramic for killing Legionella strains in vitro, bacteria were exposed to the ceramic soaked in PBS at 25 degrees C or 42 degrees C. The number of L. pneumophila began to decrease significantly after 4 h of exposure at 25 degrees C and reached < 10 log cfu/ml after 12 h. A similar significant decrease was also observed after exposure at 42 degrees C. Furthermore, it was found that the antimicrobial ceramic showed bactericidal activity against six strains of Legionella isolated from various water sources, including L. pneumophila (serotype 1-4), L. micdadei, and L. dumoffii, after 24 h of exposure. The antimicrobial activity against L. pneumophila of the supernatant obtained by soaking the ceramic in PBS for 24 h was also assessed. Bactericidal activity of this supernatant was also noted. Analysis of the supernatant by ICP-MS resulted in the detection of eight metals (Mg, Al, Ca, Mn, Zn, Sr, Ag, and Ba) at a maximum concentration of 2.5 mg/l. When reconstituted PBS was made with all eight metals at the same concentrations as in the supernatant, the reconstituted PBS containing Ag alone and all metals showed significantly bactericidal activity against L. pneumophila, but PBS with only one metal component except Ag or a combination of Ag with Zn and/or Ca did not. These findings suggest that the antimicrobial ceramic possesses strong bactericidal activity against Legionella species and that eight metals released from the ceramic have a synergistic bactericidal effect against Legionella. When the antimicrobial ceramic was placed in hot spring water or cooling tower water instead of PBS, the number of L. pneumophila in the water decreased to < 10 log cfu/ml after 24 h of exposure and the bactericidal activity persisted for 5 weeks. These results indicate that the antimicrobial ceramic can be used to eradicate Legionella species contaminating various water sources.
机译：为了评估抗微生物陶瓷在体外杀死军团菌菌株的功效，将细菌暴露于25°C或42°C的PBS中浸泡的陶瓷中。在25°C暴露4h后，嗜肺乳杆菌的数量开始显着减少。 ，并在12小时后达到<10 log cfu / ml。在42℃下暴露后，也观察到类似的显着降低。此外，发现抗菌陶瓷对六种军团菌显示了杀菌活性，这些军团菌从各种来源分离，包括嗜肺乳杆菌（1-4型血清型），L。暴露24小时后，观察到micdadei和L. dumoffii。还评估了通过将陶瓷在PBS中浸泡24小时而获得的上清液对肺炎链球菌的抗菌活性。还注意到该上清液的杀菌活性。通过ICP-MS分析上清液可检测到最大浓度为2.5 mg / l的八种金属（Mg，Al，Ca，Mn，Zn，Sr，Ag和Ba）。当用所有八种金属以与上清液中相同的浓度制备重组PBS时，仅含有Ag且所有金属的重组PBS对肺炎嗜血杆菌具有明显的杀菌活性，但是只有一种金属成分（除Ag或Ag的组合除外）的PBS具有杀菌作用。与锌和/或钙没有。这些发现表明，抗菌陶瓷对军团菌具有很强的杀菌活性，从陶瓷中释放出的八种金属对军团菌具有协同杀菌作用。当将抗菌陶瓷放置在温泉水或冷却塔水中而不是PBS中时，暴露24小时后，水中的嗜肺乳杆菌数量减少至<10 log cfu / ml，杀菌活性持续5周。这些结果表明，抗菌陶瓷可用于根除污染各种水源的军团菌。

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