Low Temperature Plasma by Corona discharge in water: lethal effect on Escherichia coli and Salmonella enterica serotype Typhimurium

D. G. Gutiérrez-León, Tomás Serrano-Ramírez
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Abstract

In this research work, inactivation of two significant global contributors to microbiological problems in water was carried out: Escherichia coli and Salmonella enterica serotype Typhimurium. Both are representative of fecal pollution and their presence could compromise water quality and food safety generating serious effects on human health.Simultaneous inactivation process of Escherichia coli and Salmonella enterica serotype Typhimurium involved the production of Low Temperature Plasma from Positive Corona discharge (20 kV, 0.45 mA) at atmospheric conditions. Initial bacteria concentrations in water were respectively, 3.4 log CFU/ml and 3.6 log CFU/ml, which are typical from poultry activities.High effectiveness (> 99%) in the process was obtained at the end of 180 s and, total inactivation of Escherichia coli and Salmonella enterica serotype Typhimurium was achieved at 360 s. During treatment, Escherichia coli bacteria showed major resistance to be reduced; nevertheless, synergistic lethal effects generated in water during the production of plasma: reactive chemical species, shock waves and UV radiation, allowed to get null bacteria survival.
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水中电晕放电低温等离子体对大肠杆菌和肠炎沙门氏菌血清型鼠伤寒杆菌的致死作用
在这项研究工作中,对水中微生物问题的两个重要全球贡献者进行了灭活:大肠杆菌和肠炎沙门氏菌血清型鼠伤寒杆菌。两者都是粪便污染的代表,它们的存在可能损害水质和食品安全,对人类健康产生严重影响。大肠杆菌和肠炎沙门氏菌血清型鼠伤寒杆菌的同时灭活过程涉及在大气条件下通过正电晕放电(20 kV, 0.45 mA)产生低温等离子体。水中细菌初始浓度分别为3.4 log CFU/ml和3.6 log CFU/ml,为典型的家禽活动水平。该工艺在180 s后获得了最高的灭活率(> 99%),在360 s时达到了对大肠杆菌和伤寒沙门氏菌的完全灭活。在处理过程中,大肠杆菌的耐药性明显降低;然而,在等离子体生产过程中,水中产生的协同致死效应:反应性化学物质、冲击波和紫外线辐射,使细菌无法存活。
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