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Hahn V, Zühlke D, Winter H, Landskron A, Bernhardt J, Sievers S, Schmidt M, von Woedtke T, Riedel K, Kolb JF. Proteomic profiling of antibiotic-resistant Escherichia coli GW-AmxH19 isolated from hospital wastewater treated with physical plasma. Proteomics 2024; 24:e2300494. [PMID: 38644344 DOI: 10.1002/pmic.202300494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 03/29/2024] [Accepted: 04/04/2024] [Indexed: 04/23/2024]
Abstract
Microorganisms which are resistant to antibiotics are a global threat to the health of humans and animals. Wastewater treatment plants are known hotspots for the dissemination of antibiotic resistances. Therefore, novel methods for the inactivation of pathogens, and in particular antibiotic-resistant microorganisms (ARM), are of increasing interest. An especially promising method could be a water treatment by physical plasma which provides charged particles, electric fields, UV-radiation, and reactive species. The latter are foremost responsible for the antimicrobial properties of plasma. Thus, with plasma it might be possible to reduce the amount of ARM and to establish this technology as additional treatment stage for wastewater remediation. However, the impact of plasma on microorganisms beyond a mere inactivation was analyzed in more detail by a proteomic approach. Therefore, Escherichia coli GW-AmxH19, isolated from hospital wastewater in Germany, was used. The bacterial solution was treated by a plasma discharge ignited between each of four pins and the liquid surface. The growth of E. coli and the pH-value decreased during plasma treatment in comparison with the untreated control. Proteome and antibiotic resistance profile were analyzed. Concentrations of nitrite and nitrate were determined as long-lived indicative products of a transient chemistry associated with reactive nitrogen species (RNS). Conversely, hydrogen peroxide served as indicator for reactive oxygen species (ROS). Proteome analyses revealed an oxidative stress response as a result of plasma-generated RNS and ROS as well as a pH-balancing reaction as key responses to plasma treatment. Both, the generation of reactive species and a decreased pH-value is characteristic for plasma-treated solutions. The plasma-mediated changes of the proteome are discussed also in comparison with the Gram-positive bacterium Bacillus subtilis. Furthermore, no effect of the plasma treatment, on the antibiotic resistance of E. coli, was determined under the chosen conditions. The knowledge about the physiological changes of ARM in response to plasma is of fundamental interest to understand the molecular basis for the inactivation. This will be important for the further development and implementation of plasma in wastewater remediation.
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Affiliation(s)
- Veronika Hahn
- Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany
| | - Daniela Zühlke
- Institute of Marine Biotechnology, Greifswald, Germany
- Department of Microbial Physiology and Molecular Biology, Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Hauke Winter
- Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany
- Department of Microbial Physiology and Molecular Biology, Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Annchristin Landskron
- Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany
- Department of Microbial Physiology and Molecular Biology, Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Jörg Bernhardt
- Department of Microbial Physiology and Molecular Biology, Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Susanne Sievers
- Department of Microbial Physiology and Molecular Biology, Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Michael Schmidt
- Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany
| | - Thomas von Woedtke
- Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany
- Institute for Hygiene and Environmental Medicine, Greifswald University Medicine, Greifswald, Germany
| | - Katharina Riedel
- Institute of Marine Biotechnology, Greifswald, Germany
- Department of Microbial Physiology and Molecular Biology, Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Juergen F Kolb
- Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany
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Ahmad Wadi AFA, Onomura D, Funamori H, Khatun MM, Okada S, Iizasa H, Yoshiyama H. Effects of Strain Differences, Humidity Changes, and Saliva Contamination on the Inactivation of SARS-CoV-2 by Ion Irradiation. Viruses 2024; 16:520. [PMID: 38675863 PMCID: PMC11055001 DOI: 10.3390/v16040520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 03/22/2024] [Accepted: 03/26/2024] [Indexed: 04/28/2024] Open
Abstract
One of the methods to inactivate viruses is to denature viral proteins using released ions. However, there have been no reports detailing the effects of changes in humidity or contamination with body fluids on the inactivation of viruses. This study investigated the effects of humidity changes and saliva contamination on the efficacy of SARS-CoV-2 inactivation with ions using multiple viral strains. Virus solutions with different infectious titers were dropped onto a circular nitrocellulose membrane and irradiated with ions from 10 cm above the membrane. After the irradiation of ions for 60, 90, and 120 min, changes in viral infectious titers were measured. The effect of ions on virus inactivation under different humidity conditions was also examined using virus solutions containing 90% mixtures of saliva collected from 10 people. A decrease in viral infectivity was observed over time for all strains, but ion irradiation further accelerated the decrease in viral infectivity. Ion irradiation can inactivate all viral strains, but at 80% humidity, the effect did not appear until 90 min after irradiation. The presence of saliva protected the virus from drying and maintained infectiousness for a longer period compared with no saliva. In particular, the Omicron strain retained its infectivity titer longer than the other strains. Ion irradiation demonstrated a consistent reduction in the number of infectious viruses when compared to the control across varying levels of humidity and irradiation periods. This underscores the notable effectiveness of irradiation, even when the reduction effect is as modest as 50%, thereby emphasizing its crucial role in mitigating the rapid dissemination of SARS-CoV-2.
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Affiliation(s)
- Afifah Fatimah Azzahra Ahmad Wadi
- Department of Microbiology, Faculty of Medicine, Shimane University, 89-1 Enya, Izumo 693-8504, Shimane, Japan; (A.F.A.A.W.); (M.M.K.); (S.O.); (H.I.)
- Faculty of Medicine, University of Muslim Indonesia, Makassar 9023, South Sulawesi, Indonesia
| | - Daichi Onomura
- Division of Virology, Department of Infection and Immunity, Faculty of Medicine, Jichi Medical University, Shimotsuke 329-0498, Tochigi, Japan;
| | | | - Mst Mahmuda Khatun
- Department of Microbiology, Faculty of Medicine, Shimane University, 89-1 Enya, Izumo 693-8504, Shimane, Japan; (A.F.A.A.W.); (M.M.K.); (S.O.); (H.I.)
| | - Shunpei Okada
- Department of Microbiology, Faculty of Medicine, Shimane University, 89-1 Enya, Izumo 693-8504, Shimane, Japan; (A.F.A.A.W.); (M.M.K.); (S.O.); (H.I.)
| | - Hisashi Iizasa
- Department of Microbiology, Faculty of Medicine, Shimane University, 89-1 Enya, Izumo 693-8504, Shimane, Japan; (A.F.A.A.W.); (M.M.K.); (S.O.); (H.I.)
| | - Hironori Yoshiyama
- Department of Microbiology, Faculty of Medicine, Shimane University, 89-1 Enya, Izumo 693-8504, Shimane, Japan; (A.F.A.A.W.); (M.M.K.); (S.O.); (H.I.)
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No-ozone cold plasma can kill oral pathogenic microbes in H 2O 2-dependent and independent manner. Sci Rep 2022; 12:7597. [PMID: 35534525 PMCID: PMC9085805 DOI: 10.1038/s41598-022-11665-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 04/25/2022] [Indexed: 01/05/2023] Open
Abstract
To apply the sterilisation effect of low-temperature plasma to the oral cavity, the issue of ozone from plasma must be addressed. In this study, a new technology for generating cold plasma with almost no ozone is developed and is named Nozone (no-ozone) Cold Plasma (NCP) technology. The antimicrobial efficacy of the NCP against four oral pathogens is tested, and its specific mechanism is elucidated. The treatment of NCP on oral pathogenic microbes on a solid medium generated a growth inhibition zone. When NCP is applied to oral pathogens in a liquid medium, the growth of microbes decreased by more than 105 colony forming units, and the bactericidal effect of NCP remained after the installation of dental tips. The bactericidal effect of NCP in the liquid medium is due to the increase in hydrogen peroxide levels in the medium. However, the bactericidal effect of NCP in the solid medium depends on the charged elements of the NCP. Furthermore, the surface bactericidal efficiency of the dental-tip-installed NCP is proportional to the pore size of the tips and inversely proportional to the length of the tips. Overall, we expect this NCP device to be widely used in dentistry in the near future.
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Zhang C, Cui H, Zhang C, Chen Z, Jiang X, Liu J, Wan Z, Li J, Liu J, Gao Y, Jin N, Guo Z. Aerosol Transmission of the Pandemic SARS-CoV-2 and Influenza A Virus Was Blocked by Negative Ions. Front Cell Infect Microbiol 2022; 12:897416. [PMID: 35573774 PMCID: PMC9105223 DOI: 10.3389/fcimb.2022.897416] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 04/04/2022] [Indexed: 12/29/2022] Open
Abstract
The pandemic of respiratory diseases, such as coronavirus disease 2019 (COVID-19) and influenza, has imposed significant public health and economic burdens on the world. Wearing masks is an effective way to cut off the spread of the respiratory virus. However, due to cultural differences and uncomfortable wearing experiences, not everyone is willing to wear masks; there is an urgent need to find alternatives to masks. In this study, we tested the disinfection effect of a portable ionizer on pandemic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (strain V34) and influenza A virus (strain CA04). Negative ions significantly reduced the concentration of particulate matter in the air above and effectively disinfected viruses stuck to the solid plate at the level of both nucleic acid and virus titer. The disinfection efficiency was >99.8% after 1-h exposure. Moreover, negative ions effectively disinfected aerosolized viruses; the disinfection efficiency was more than 87.77% after purification for 10 min. Furthermore, negative ions had a significant protective effect on susceptible animals exposed to viral aerosols. When the negative ionizer was switched from off to on, the inhalation 50% infective dose (ID50) for golden hamsters challenged with SARS-CoV-2 rose from 9.878 median tissue culture infective dose (TCID50) [95% confidence interval (CI), 6.727–14.013 TCID50] to 43.891 TCID50 (95% CI, 29.31–76.983 TCID50), and the inhalation ID50 for guinea pigs challenged with influenza A virus rose from 6.696 TCID50 (95% CI, 3.251–9.601 TCID50) to 28.284 TCID50 (95% CI, 19.705–40.599 TCID50). In the experiment of transmission between susceptible animals, negative ions 100% inhibited the aerosol transmission of SARS-CoV-2 and influenza A virus. Finally, we tested the safety of negative ion exposure. Balb/c mice exposed to negative ions for 4 weeks showed no abnormalities in body weight, blood routine analysis, and lung pathology. Our study demonstrates that air ions can be used as a safe and effective means of blocking respiratory virus transmission and contribute to pandemic prevention and control.
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Affiliation(s)
- Cheng Zhang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Huan Cui
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Chunmao Zhang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Zhaoliang Chen
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Xinyun Jiang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Jun Liu
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Zhonghai Wan
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Jiping Li
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Juxiang Liu
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
- *Correspondence: Juxiang Liu, ; Yuwei Gao, ; Ningyi Jin, ; Zhendong Guo,
| | - Yuwei Gao
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
- *Correspondence: Juxiang Liu, ; Yuwei Gao, ; Ningyi Jin, ; Zhendong Guo,
| | - Ningyi Jin
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
- *Correspondence: Juxiang Liu, ; Yuwei Gao, ; Ningyi Jin, ; Zhendong Guo,
| | - Zhendong Guo
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
- *Correspondence: Juxiang Liu, ; Yuwei Gao, ; Ningyi Jin, ; Zhendong Guo,
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Nunayon SS, Zhang HH, Chan V, Kong RYC, Lai ACK. Study of synergistic disinfection by UVC and positive/negative air ions for aerosolized Escherichia coli, Salmonella typhimurium, and Staphylococcus epidermidis in ventilation duct flow. INDOOR AIR 2022; 32:e12957. [PMID: 34796996 DOI: 10.1111/ina.12957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 10/29/2021] [Accepted: 10/30/2021] [Indexed: 06/13/2023]
Abstract
The efficacy of the in-duct application of ultraviolet waveband C (UVC) emitting at 254 nm wavelength and air ions against aerosolized bacteria was studied in a full-scale 9-m long ventilation duct. Combined positive and negative ion polarities (bipolar ions) and combined UVC and ions were tested. The UVC was generated by a mercury-type UVC lamp and air ions were generated by positive and negative polarity ionizers. Escherichia coli (E. coli), Salmonella typhimurium (S. typhimurium), and Staphylococcus epidermidis (S. epidermidis)were tested at a concentration of 108 to 109 cells in 50 ml of sterilized distilled water. The case in which the positive ionizer was placed first, followed by the negative ionizer, demonstrated significantly higher disinfection efficiencies for E. coli (p = 0.007) and S. typhimurium (p < 0.001), but lower efficiency for S. epidermidis (p = 0.01) than the reversed sequence. The combination of UVC (3.71 J/m2 ) and air ions (1.13 × 1012 ions/m3 for positive ions and 8.00 × 1011 ions/m3 for negative ions) led to higher inactivation than individual disinfection agents operating under the same dose. A synergetic inactivation effect was observed for S. epidermidis under the combined UVC and positive ion case, while the combined UVC and negative ion case showed significant synergy effects for E. coli and S. typhimurium.
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Affiliation(s)
- Sunday S Nunayon
- Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China
| | - Hui H Zhang
- Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China
| | - Vincent Chan
- Department of Biomedical Engineering, Khalifa University of Science and Technology, Abu Dhabi, UAE
| | - Richard Y C Kong
- Department of Chemistry, City University of Hong Kong, Hong Kong, China
| | - Alvin C K Lai
- Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China
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Positive and Negative Ions Potently Inhibit the Viability of Airborne Gram-Positive and Gram-Negative Bacteria. Microbiol Spectr 2021; 9:e0065121. [PMID: 34756075 PMCID: PMC8579920 DOI: 10.1128/spectrum.00651-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Positive and negative ions (PAIs and NAIs, respectively) generated by air ionizers curb indoor spread of airborne pathogens through cellular oxidative damage. Thus, here, we asked whether ion exposure of Staphylococcus aureus and Escherichia coli bacteria—either plated on agar or trapped in air filters—would affect their viability and whether this effect would be influenced by variations in bacterial type and load, action area, distance from the ion generator, exposure time, or filter type. We selected these two vegetative bacterium species because, besides being representative of Gram-positive and Gram-negative strains, respectively, they are widely recognized as the two most common airborne pathogens. We observed a robust ion inhibitory effect on the viability of free bacteria regardless of the experimental condition employed. Specifically, 12-h ion exposure of plated S. aureus and E. coli, at either 5 cm or 10 cm from the ion source, reduced bacterial viability by ∼95% and 70%, respectively. Furthermore, 3-h ion exposure was sufficient to reduce the viability of both bacterial species trapped in filters. Our results showing a strong antibacterial activity of PAI and NAI under all experimental conditions tested further support the use of air ionizers for preventing and/or containing airborne infection in domestic and nondomestic settings. IMPORTANCE Indoor air is a well-established vehicle for direct and indirect spread of a wide variety of human pathogens—as bioaerosols are composed of bacteria, viruses, fungi, and other types of organisms—that may trigger some pathologies. Plasmacluster ionizers are known for their ability to generate positively or negatively charged air ions (PAIs and NAIs, respectively) that can kill/inactivate indoor airborne pathogens, through oxidative stress-induced damage, in various environments. Given these premises, the aim of this study was to evaluate the viability of Gram-positive and Gram-negative bacteria exposed to PAI and NAI under different experimental variables such as bacterial type and load, action area, distance from the ion generator, ion exposure time, and filter type. Altogether, our findings, demonstrating a remarkable PAI and NAI antibacterial activity, stress the importance of using air ionizers to prevent indoor airborne infection.
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Xu L, Hou H, Farkas B, Keener KM, Garner AL, Tao B. High voltage atmospheric cold plasma modification of bovine serum albumin. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Hernández-Díaz D, Martos-Ferreira D, Hernández-Abad V, Villar-Ribera R, Tarrés Q, Rojas-Sola JI. Indoor PM2.5 removal efficiency of two different non-thermal plasma systems. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 278:111515. [PMID: 33113396 DOI: 10.1016/j.jenvman.2020.111515] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 10/02/2020] [Accepted: 10/12/2020] [Indexed: 06/11/2023]
Abstract
The use of non-thermal plasma (NTP) generators in air processing systems and their duct networks to improve indoor air quality (IAQ) has grown considerably in recent years. This paper reviews the advantages and disadvantages of NTP generators for IAQ improvement in biological, chemical and particulate pollutant terms. Also, it assesses and compares the ability of a multipin corona discharge (MPCD) and a dielectric barrier discharge (DBD) generator to reduce the concentration of fine particulate matter (PM2.5) in recycled, unfiltered air in a refrigeration chamber. The MPCD generator was found to have a higher PM2.5 removal efficiency; also, it was faster in removing pollutants, used less energy, and produced much less ozone. The fact that the MPCD generator performed better was seemingly the result of its increased ion production mainly. NTP generators, however, cannot match air filtration media purifiers in this respect as the latter are much more effective in removing particles. Besides, NTP-based air purifying technology continues to be subject to a major drawback, namely: the formation of ozone as a by-product. In any case, the ozone generation was uncorrelated to ion emission when using different technologies.
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Affiliation(s)
- D Hernández-Díaz
- Serra Húnter Programme, Department of Engineering Graphics and Design, Polytechnic University of Catalonia, TR5 Campus Terrassa, 08222, Terrassa, Spain.
| | - D Martos-Ferreira
- Department of Electronics, The Salesian University School of Sarrià, Passeig Sant Joan Bosco 74, 08017, Barcelona, Spain.
| | - V Hernández-Abad
- Department of Engineering Graphics and Design, Polytechnic University of Catalonia, TR5 Campus Terrassa, 08222, Terrassa, Spain.
| | - R Villar-Ribera
- Department of Engineering Graphics and Design, Polytechnic University of Catalonia, Campus Manresa, 08242, Manresa, Spain.
| | - Q Tarrés
- LEPAMAP Group, Department of Chemical Engineering, University of Girona, 17003, Girona, Spain.
| | - J I Rojas-Sola
- Department of Engineering Graphics, Design and Projects, University of Jaén, 23071, Jaén, Spain.
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Baggio A, Marino M, Innocente N, Celotto M, Maifreni M. Antimicrobial effect of oxidative technologies in food processing: an overview. Eur Food Res Technol 2020. [DOI: 10.1007/s00217-020-03447-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Zhou P, Yang Y, Huang G, Lai ACK. Numerical and experimental study on airborne disinfection by negative ions in air duct flow. BUILDING AND ENVIRONMENT 2018; 127:204-210. [PMID: 32287975 PMCID: PMC7116982 DOI: 10.1016/j.buildenv.2017.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 10/31/2017] [Accepted: 11/03/2017] [Indexed: 05/03/2023]
Abstract
In this paper, we develop a mathematical model that aims (1) to predict the distribution of negative ions generated by an air ionizer installed in a ventilation duct and (2) to predict the efficiency with which it inactivates bacteria. The transportation equation for the negative ions was resolved combined with the bulk air velocity and the electric field. The bacteria distribution was solved numerically by integrating the susceptibility constant, which was acquired from the experiments. Two types of bacteria (Serratia marcescens, Staphylococcus epidermidis) were aerosolized and released into a 9-m ventilation duct system. Inactivation efficiencies were calculated for inlet velocities from 2 to 6.5 m/s and for various ion intensities. The efficiencies for S. marcescens and S. epidermidis were 31.53% (SD, 11.4%) and 12.17% (SD, 0.43%), respectively, with susceptibility constants of 8.67 × 10-11 Colony-Forming Units (CFU)/ions and 2.72 × 10-11 CFU/ions, respectively. The modeling results matched those of the experiments well. The pressure penalty at the maximum velocity (6.5 m/s) was only 9 Pa. The results show that the use of negative ions has great potential to enhance indoor air quality by reducing airborne microorganisms in ventilation systems.
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Affiliation(s)
- Pei Zhou
- School of Civil Engineering, Hefei University of Technology, Hefei, Anhui, China
- Department of Architectural and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Yi Yang
- College of Engineering, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Gongsheng Huang
- Department of Architectural and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Alvin C K Lai
- Department of Architectural and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, China
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Kim YM, Yun HS, Eom SH, Sung BJ, Lee SH, Jeon SM, Chin SW, Lee MS. Bactericidal Action Mechanism of Nonthermal Plasma: Denaturation of Membrane Proteins. IEEE TRANSACTIONS ON RADIATION AND PLASMA MEDICAL SCIENCES 2018. [DOI: 10.1109/trpms.2017.2762732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Okano H, Fujimura T, Fukuoka N, Hayashi T, Nishikawa K, Ono K, Kawamoto S. Plasma Cluster Ions Reduce the IgE-Binding Capacity of House Dust Mite Allergens under a Simulated Indoor Environmental Condition. Int Arch Allergy Immunol 2017; 173:199-203. [PMID: 28848159 DOI: 10.1159/000477724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 05/23/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND A high level of house dust mite (HDM) allergens in a living environment is a risk factor for both sensitization to these allergens and asthmatic attacks. We previously showed that plasma cluster ions (PCIs) impaired the IgE-binding capacity of atomized crude allergens prepared from Japanese cedar pollen and fungus under experimental conditions. OBJECTIVE We evaluated the capacity of PCIs to impair the IgE-binding capacity of airborne HDM allergens under a simulated indoor environmental condition. METHODS For the determination of the effects of PCIs on HDM allergens under an experimental condition, HDM extract was atomized as aqueous mist into a cylindrical experimental apparatus filled with PCIs. For the evaluation of the effects of PCIs under a simulated natural indoor environmental condition, dried HDM allergens were floated as airborne particles in an acryl cubic apparatus in the presence of PCIs. The IgE-binding capacities of the PCI- and sham-treated HDM allergens were analyzed by an ELISA. RESULTS The IgE-binding capacity of the HDM allergens was significantly impaired after PCI treatment compared to that after sham treatment under both experimental and simulated environmental conditions. The ELISA results demonstrated that the IgE-binding capacities of HDM allergens after PCI treatment showed 68 and 74% reductions compared to those after sham treatment under the experimental and simulated environmental conditions, respectively. CONCLUSIONS PCIs have the capacity to impair the IgE-binding capacity of airborne HDM allergens in a simulated environmental condition.
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Affiliation(s)
- Hiroaki Okano
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Japan
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Hyun J, Lee SG, Hwang J. Application of corona discharge-generated air ions for filtration of aerosolized virus and inactivation of filtered virus. JOURNAL OF AEROSOL SCIENCE 2017; 107:31-40. [PMID: 32226115 PMCID: PMC7094352 DOI: 10.1016/j.jaerosci.2017.02.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 12/07/2016] [Accepted: 02/09/2017] [Indexed: 05/19/2023]
Abstract
The effect of corona discharge-generated air ions on the filtration of aerosolized bacteriophage MS2 was studied. A carbon-fiber ionizer was installed upstream of a medium-efficiency air filter to generate air ions, which were used to charge the virus aerosols and increase their filtration efficiency. After the virus aerosols were captured by the filter for a certain time interval, they were exposed to a newly incoming air ion flow. Captured virus particles were detached from the filter by sonication, and their antiviral efficiency due to air ions was calculated by counting the plaque-forming units. The antiviral efficiency increased with ion exposure time and ion concentration. When the concentration of positive air ions was 107 ions/cm3, the antiviral efficiencies were 46.1, 78.8, and 83.7% with exposure times of 15, 30, and 45 min, respectively. When the ionizer was operated in a bipolar mode, the number concentrations of positive and negative ions were 6.6×106 and 3.4×106 ions/cm3, respectively, and the antiviral efficiencies were 64.3, 89.1, and 97.4% with exposure times of 15, 30, and 45 min, respectively. As a quantitative parameter for the performance evaluation of air ions, the susceptibility constant of bacteriophage MS2 to positive, negative, bipolar air ions was calculated as 5.5×10-3, 5.4×10-3 and 9.5×10-3, respectively. These susceptibility constants showed bipolar ion treatment was more effective about 1.7 times than unipolar ion treatment.
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Affiliation(s)
- Junho Hyun
- Graduate Programs in Clean Technology, Yonsei University, Seoul 03722, Korea
| | - Sang-Gu Lee
- Graduate Programs in Clean Technology, Yonsei University, Seoul 03722, Korea
| | - Jungho Hwang
- Graduate Programs in Clean Technology, Yonsei University, Seoul 03722, Korea
- Department of Mechanical Engineering, Yonsei University, Seoul, 03722, Korea
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Liao X, Liu D, Xiang Q, Ahn J, Chen S, Ye X, Ding T. Inactivation mechanisms of non-thermal plasma on microbes: A review. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.12.021] [Citation(s) in RCA: 176] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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15
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Guo J, Li Z, Huang K, Li Y, Wang J. Morphology analysis of Escherichia coli treated with nonthermal plasma. J Appl Microbiol 2017; 122:87-96. [PMID: 27792254 DOI: 10.1111/jam.13335] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Revised: 10/18/2016] [Accepted: 10/24/2016] [Indexed: 11/29/2022]
Abstract
AIMS Nonthermal plasma agents (reactive species and charged particles) are generally generated together. Previous studies of nonthermal plasma agents did not investigate the role of a microbial inactivation agent without interference from other agents. Consequently, the exact mechanism underlying their activity remains unclear. The present experiment was conducted to study the mechanism underlying Escherichia coli inactivation by nonthermal plasma. METHODS AND RESULTS The mechanism underlying E. coli inactivation by charged particles was studied using pure argon plasma. Results showed that cell wall damage owing to strong electrostatic forces did not occur during direct current (DC) plasma treatment with Ar or N2 . Next, the inactivation effects of excited N2∗, N2+, ozone, OH radicals, and nitric oxide were investigated using pure nitrogen plasma and air plasma. Morphological changes and cell rupture of E. coli were observed after 5 min of treatment with nonthermal plasma in air, but not with argon and nitrogen plasma treatments. CONCLUSIONS Our data demonstrate that reactive oxygen species play an essential role in the inactivation of E. coli. SIGNIFICANCE AND IMPACT OF THE STUDY A clear understanding of the mechanisms underlying nonthermal plasma's inactivation of micro-organism is essential for the practical applications of nonthermal plasma techniques.
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Affiliation(s)
- J Guo
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China.,Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Z Li
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
| | - K Huang
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
| | - Y Li
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China.,Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR, USA
| | - J Wang
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
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16
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Nishikawa K, Fujimura T, Ota Y, Abe T, ElRamlawy KG, Nakano M, Takado T, Uenishi A, Kawazoe H, Sekoguchi Y, Tanaka A, Ono K, Kawamoto S. Exposure to positively- and negatively-charged plasma cluster ions impairs IgE-binding capacity of indoor cat and fungal allergens. World Allergy Organ J 2016; 9:27. [PMID: 27660668 PMCID: PMC5011831 DOI: 10.1186/s40413-016-0118-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 08/03/2016] [Indexed: 11/12/2022] Open
Abstract
Background Environmental control to reduce the amount of allergens in a living place is thought to be important to avoid sensitization to airborne allergens. However, efficacy of environmental control on inactivation of airborne allergens is not fully investigated. We have previously reported that positively- and negatively-charged plasma cluster ions (PC-ions) reduce the IgE-binding capacity of crude allergens from Japanese cedar pollen as important seasonal airborne allergens. Cat (Felis domesticus) and fungus (Aspergillus fumigatus) are also important sources of common airborne allergens in living spaces throughout the year, and early sensitization with those allergens is considered to be a risk factor for future development of allergic rhinitis, pollinosis and asthma. The aim of this study is to examine whether the PC-ions reduce the IgE-binding capacity of a cat major allergen (Fel d 1) and fungal allergens in an experimental condition. Methods Fel d 1, crude fungal extract, or a fungal major allergen Asp f 1, was treated with PC-ions for 6 h in an experimental cylindrical apparatus. Sham-treated allergens were prepared in the same experimental apparatus without generation of PC-ions. The degradation of the PC-ions-treated Fel d 1 was analyzed by SDS-PAGE, and the IgE-binding capacity of the PC-ions-treated allergens was analyzed by ELISA inhibition assay. Results Exposure of Fel d 1, crude fungal extract and Asp f 1 to PC-ions significantly decreased protein content of Fel d 1 or Asp f 1, respectively. SDS-PAGE analysis suggested that the decreased Fel d 1 content upon exposure with PC-ions was attributable to protein degradation. ELISA inhibition indicated that the PC-ions treatment significantly impaired IgE-binding capacities of Fel d 1, crude fungal allergens, and Asp f 1 compared to sham treatment. Discussion Our data suggest that treatment with PC-ions not only reduce indoor cat and fungal allergens, but also impair their allergenicity. Conclusion These results suggest that environmental control with PC-ions is useful for inactivation of indoor cat and fungal allergens.
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Affiliation(s)
- Kazuo Nishikawa
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan
| | - Takashi Fujimura
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan
| | - Yasuhiro Ota
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan
| | - Takuya Abe
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan
| | - Kareem Gamal ElRamlawy
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan
| | - Miyako Nakano
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan
| | - Tomoaki Takado
- Engineering Department III, Plasma cluster Equipment Division, Health and Environment Systems Group, SHARP Corporation, Osaka, Japan
| | - Akira Uenishi
- Engineering Department III, Plasma cluster Equipment Division, Health and Environment Systems Group, SHARP Corporation, Osaka, Japan
| | - Hidechika Kawazoe
- Engineering Department III, Plasma cluster Equipment Division, Health and Environment Systems Group, SHARP Corporation, Osaka, Japan
| | - Yoshinori Sekoguchi
- Engineering Department III, Plasma cluster Equipment Division, Health and Environment Systems Group, SHARP Corporation, Osaka, Japan
| | - Akihiko Tanaka
- Division of Allergology and Respiratory Medicine, Department of Medicine, Showa University, Tokyo, Japan
| | - Kazuhisa Ono
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan.,Department of Food Sciences and Biotechnology, Faculty of Life Sciences, Hiroshima Institute of Technology, Hiroshima, Japan
| | - Seiji Kawamoto
- Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 730-8530 Japan
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17
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Abu-Hakmeh A, Kung A, Mintz BR, Kamal S, Cooper JA, Lu XL, Wan LQ. Sequential gelation of tyramine-substituted hyaluronic acid hydrogels enhances mechanical integrity and cell viability. Med Biol Eng Comput 2016; 54:1893-1902. [DOI: 10.1007/s11517-016-1474-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Accepted: 02/15/2016] [Indexed: 01/02/2023]
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18
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Guo J, Huang K, Wang J. Bactericidal effect of various non-thermal plasma agents and the influence of experimental conditions in microbial inactivation: A review. Food Control 2015. [DOI: 10.1016/j.foodcont.2014.09.037] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Yamamoto D, Wako K, Sato Y, Fujishiro M, Matsuura I, Ohnishi Y. Positive and negative ions by air purifier have no effects on embryo-fetal development in rats. J Toxicol Sci 2014; 39:447-52. [PMID: 24849679 DOI: 10.2131/jts.39.447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Air purifiers, which release positive and negative ions generated by an electric discharge into the air, have been widely used in common households. In this study, the developmental toxicity potential of the ionized air containing positive and negative ions was evaluated in SD rats [Crl:CD(SD)] following whole-body inhalation to obtain preliminary information for the definitive study. Two groups of 10 pregnant female rats were exposed to the ionized air at concentrations of 0 and 7,000,000 ions/cm(3) for 6 hr per day from Days 6 to 19 of gestation. All dams underwent a cesarean section on Day 20 of gestation and their fetuses were examined externally, viscerally, and skeletally for morphological changes. The ionized air had no effects on dams in terms of clinical signs, body weight, food consumption, gravid uterine weights, corrected body weight by gravid uterine weight, or necropsy findings. In addition, there were no effects on the maintenance of pregnancy, including abortion or premature delivery. No exposure-related changes were detected in the number of corpora lutea, implantations, dead embryos, or live fetuses, implantation loss, live fetal weights, sex ratio, or placental weight or features. Fetal examination revealed no external, visceral, or skeletal anomalies or variations caused by the ionized air, nor were there any changes in degree of ossification. Although this study did not fully adhere to the current guidelines because of a smaller number of animals per group, it was suggested that the ionized air has no maternal toxicity or embryo-fetal toxicity in rats.
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Affiliation(s)
- Dai Yamamoto
- Nonclinical Research Center, Drug Development Service Segment, LSI Medience Corporation
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20
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Tyagi AK, Malik A, Gottardi D, Guerzoni ME. Essential oil vapour and negative air ions: A novel tool for food preservation. Trends Food Sci Technol 2012. [DOI: 10.1016/j.tifs.2012.02.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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21
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Tyagi AK, Malik A. Bactericidal action of lemon grass oil vapors and negative air ions. INNOV FOOD SCI EMERG 2012. [DOI: 10.1016/j.ifset.2011.09.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Kim YS, Yoon KY, Park JH, Hwang J. Application of air ions for bacterial de-colonization in air filters contaminated by aerosolized bacteria. THE SCIENCE OF THE TOTAL ENVIRONMENT 2011; 409:748-755. [PMID: 21146197 DOI: 10.1016/j.scitotenv.2010.11.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 09/27/2010] [Accepted: 11/15/2010] [Indexed: 05/30/2023]
Abstract
We aerosolized the Escherichia coli (E. coli) and Staphylococcus epidermidis (S. epidermidis) bacteria and collected them on membrane filters. Then we generated air ions by applying a high voltage to a carbon fiber tip and applied them to the contaminated filters. The antibacterial efficiency was not significantly affected by the bacteria being Gram-positive or Gram-negative, however, negative ions showed a lower antibacterial efficiency than positive ions to both E. coli and S. epidermidis, even though the concentration of negative air ions was much higher than that of positive air ions. With a field emission scanning electron microscope (FE-SEM) images and fluorescence microscopy images using a LIVE/DEAD BacLight Bacterial Viability Kit, electrostatic disruption of the bacteria was found to be the dominant antibacterial effect.
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Affiliation(s)
- Yang Seon Kim
- School of Mechanical Engineering, Yonsei University, 262 Seongsanno, Seodaemun-Gu, Seoul, Republic of Korea.
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23
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Kawamoto K, Sato I, Yoshida M, Tsuda S. Air purifiers that diffuse reactive oxygen species potentially cause DNA damage in the lung. J Toxicol Sci 2010; 35:929-33. [PMID: 21139343 DOI: 10.2131/jts.35.929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Several appliance manufacturers have recently released new type air purifiers that can disinfect bacteria, fungi and viruses by diffusing reactive oxygen species (ROS) into the air. In this study, mice were exposed to the outlet air from each of 3 air purifiers from different manufacturers (A, B, C), and the lung was examined for DNA damage, lipid peroxidation and histopathology to confirm the safety of these air purifiers. Neither abnormal behavior during exposure nor gross abnormality at necropsy was observed. No histopathological changes were also observed in the lung. However, significant increase of DNA damage was detected by the comet assay in the lung immediately after the direct exposure for 48 hr to models A and B, and for 16 hr to model B. As for model B, DNA migration was also increased by 2 hr exposure in a 1 m(3) plastic chamber but not by 48 hr exposure in a room (12.6 m(3)). Model C did not cause DNA damage. Lipid peroxidation and 8-hydroxy deoxyguanosine (8-OH-dG) was not increased under the conditions DNA damage was detected by the comet assay. The present results revealed that some models of air purifiers that diffuse ROS potentially cause DNA damage in the lung although the mechanism was left unsolved.
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Air Purification Technology by Means of Cluster Ions Generated by Plasma Discharge at Atmospheric Pressure. BIOENGINEERING IN CELL AND TISSUE RESEARCH 2008. [PMCID: PMC7121169 DOI: 10.1007/978-3-540-75409-1_26] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/29/2022]
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