Inactivation of Aquatic Microorganisms by Low-Frequency AC Discharges

Chen, Chih‐Wei; Lee, How-Ming; Chang, Moo Been

doi:10.1109/tps.2007.913928

Cited by 64 publications

(20 citation statements)

References 13 publications

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“…Many researchers report strong acidification of the liquid by plasma treatment as long as non-buffered solutions are used [5,18]. The presence of a phosphate buffer inhibits the acidification [7,32].…”

Section: Chemical Characterization Of the Liquidsmentioning

confidence: 99%

“…The presence of a phosphate buffer inhibits the acidification [7,32]. Depending on the treated volume and the plasma source used, the acidification takes only one minute (V = 1.5 mL, [7]) or more than 10 min (V = 1 L, [5]). We treated in our experiments 500 mL of water for 30 min and opted for 10 min interval of measurement to investigate the general behavior of the liquid (Figures 6 and 7).…”

Section: Chemical Characterization Of the Liquidsmentioning

confidence: 99%

“…Several electrode configurations and modes of electrical operation for liquid treatment were investigated. Generally, these discharges can be ignited directly in the liquid [3], between one electrode above the liquid and the surface of the liquid itself serving as the counter electrode [4][5][6], and in close vicinity to the water surface, e.g., by a dielectric barrier discharge [7] or with a gliding arc discharge [8]. Configurations using plasma jets [9] or high-voltage-fed hollow needles [10] and electro-spraying were also investigated [11].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it was described that chemical contaminations, e.g., with pharmaceuticals, in the water were decomposed over the course of the plasma treatment [20][21][22]. Further experiments revealed that the plasma-treated water became antimicrobial [5,7,18]. In these experiments, bacteria such as Staphylococcus aureus and Escherichia coli were significantly inactivated.…”

Section: Introductionmentioning

confidence: 99%

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Plasma-Activation of Larger Liquid Volumes by an Inductively-Limited Discharge for Antimicrobial Purposes

et al. 2019

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A new configuration of a discharge chamber and power source for the treatment of up to 1 L of liquid is presented. A leakage transformer, energizing two metal electrodes positioned above the liquid, limits the discharge current inductively by utilizing the weak magnetic coupling between the primary and secondary coils. No additional means to avoid arcing (electric short-circuiting), e.g., dielectric barriers or resistors, are needed. By using this technique, exceeding the breakdown voltage leads to the formation of transient spark discharges, producing non-thermal plasma (NTP). These discharges effected significant changes in the properties of the treated liquids (distilled water, physiological saline solution, and tap water). Considerable concentrations of nitrite and nitrate were detected after the plasma treatment. Furthermore, all tested liquids gained strong antibacterial efficacy which was shown by inactivating suspended Escherichia coli and Staphylococcus aureus. Plasma-treated tap water had the strongest effect, which is shown for the first time. Additionally, the pH-value of tap water did not decrease during the plasma treatment, and its conductivity increased less than for the other tested liquids.

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Section: Chemical Characterization Of the Liquidsmentioning

confidence: 99%

Section: Chemical Characterization Of the Liquidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plasma-Activation of Larger Liquid Volumes by an Inductively-Limited Discharge for Antimicrobial Purposes

et al. 2019

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“…Another possible explanation for these results is the generation of acidic H 3 O + ions by reactions of the water molecules with H 2 O 2 50 . Other researchers have noted an increase in acidity and formation of nitrous (HNO 2 ) and nitric (HNO 3 ) acid, along with H 2 O 2, in unbuffered water 43 , 51 .…”

Section: Resultsmentioning

confidence: 98%

Investigation of the Roles of Plasma Species Generated by Surface Dielectric Barrier Discharge

Pai

Timmons

Roehm

et al. 2018

Sci Rep

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As an emerging sterilization technology, cold atmospheric plasma offers a dry, non-thermal, rapid process that is minimally damaging to a majority of substrates. However, the mechanisms by which plasma interacts with living cells are poorly understood and the plasma generation apparatuses are complex and resource-intensive. In this study, the roles of reactive oxygen species (ROS), nitric oxide (NO), and charged particles (ions) produced by surface dielectric barrier discharge (SDBD) plasma on prokaryotic (Listeria monocytogenes (Gram-positive)) and eukaryotic (human umbilical vein endothelial cells (HUVEC)) cellular function were evaluated. HUVEC and bacterial oxidative stress responses, the accumulation of nitrite in aqueous media, air ion density, and bacterial inactivation at various distances from SDBD actuators were measured. SDBD actuator designs were also varied in terms of electrode number and length to evaluate the cellular effects of plasma volume and power distribution. NO and ions were found to contribute minimally to the observed cellular effects, whereas ROS were found to cause rapid bacterial inactivation, induce eukaryotic and prokaryotic oxidative stress, and result in rapid oxidation of bovine muscle tissue. The results of this study underscore the dominance of ROS as the major plasma generated species responsible for cellular effects, with ions and RNS having a secondary, complimentary role.

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2013

Plasma Medicine

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Inactivation of Aquatic Microorganisms by Low-Frequency AC Discharges

Cited by 64 publications

References 13 publications

Plasma-Activation of Larger Liquid Volumes by an Inductively-Limited Discharge for Antimicrobial Purposes

Plasma-Activation of Larger Liquid Volumes by an Inductively-Limited Discharge for Antimicrobial Purposes

Investigation of the Roles of Plasma Species Generated by Surface Dielectric Barrier Discharge

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