The persistent microbicidal effect in water exposed to the corona discharge |
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| Authors: | Jaroslav Julák Vladimír Scholtz Soňa Kotúčová Olga Janoušková |
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| Institution: | 1. Institute of Immunology and Microbiology, First Faculty of Medicine, Charles University in Prague, Studni?kova 7, 128 00 Praha 2, Czech Republic;2. Department of Physics and Measurements, Faculty of Chemical Engineering, Institute of Chemical Technology, Technická 5, 166 28 Praha 6, Czech Republic;1. Department of Animal Science and Biotechnology, Chungnam National University, Daejeon, 305-764, Republic of Korea;2. Department of Animal Science, Uva Wellassa University, Badulla, 90000, Sri Lanka;3. Department of Agricultural Biotechnology, Center for Food and Bioconvergence, Research Institute of Agriculture and Life Science, Seoul National University, Seoul, 151-921, Republic of Korea;4. Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea;1. Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 484-8603, Japan;2. Graduate School of Medicine, Nagoya University, 65 Tsurumai-cho, Showa, Nagoya, 466-8560, Japan;3. Toyama University, 2630 Sugitani, Toyama, 930-0194, Japan;1. National Institute for Lasers, Plasma and Radiation Physics, Department of Plasma Physics and Nuclear Fusion, Atomistilor Street 409, PO Box MG-36, 077125 Magurele-Bucharest, Romania;2. University of Bucharest, Department of Organic Chemistry, Biochemistry and Catalysis, Bd. Regina Elisabeta 4-12, 030016 Bucharest, Romania;1. School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia;2. School of Chemistry and Physics, Centre for Materials Science, Queensland University of Technology, Brisbane, Queensland 4000, Australia;3. School of Biology and Environmental Science, Queensland University of Technology, Brisbane, Queensland 4000, Australia;4. School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, People’s Republic of China;5. Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, Queensland 4111, Australia;6. Particle and Catalysis Research Group, School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia |
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| Abstract: | This article describes and particularly explains a new phenomenon of persistent microbicidal effect of water previously exposed to the low-temperature plasma, which cannot be attributed to the acidification only. The direct microbicidal action of plasma is well documented, being mediated by number of reactive particles with a short lifetime. However, we observed the microbicidal effect also in exposed water stored for a month, where it must be mediated by stable particles. In water and in phosphate-buffered saline, the formation of NOx and corresponding acids, H2O2 and O3 was confirmed after exposition to the low-temperature plasma generated in air by DC negative glow corona and positive streamer discharge. The time course of acidification, H2O2 and O3 formation were deremined. Except uncertain traces of HCN, SIFT-MS analysis of exposed liquids reveals no additional reactive compounds. The microbicidal effect persists almost unchanged during 4 weeks of storage, although O3 completely and H2O2 almost disappears. Staphylococcus epidermidis and Escherichia coli were inactivated within 10 min of incubation in exposed liquids, Candida albicans needs at least 1 h. The solutions prepared by artificial mixing of reactive compounds mimic the action of exposed water, but in lesser extent. The acid milieu is the main cause of the microbicidal effect, but the possibility of still unidentified additional compound remains open. |
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