Microbial Inactivation in the Liquid Phase Induced by Multigas Plasma Jet

Takamatsu, Takeichiro; Uehara, Kodai; Sasaki, Yota; Miyahara, Hidekazu; Matsumura, Yukihiko; Iwasawa, Atsuo; Ito, Norihiko; Kohno, Masahiro; Azuma, Takeshi; Okino, Akitoshi

doi:10.1371/journal.pone.0132381

Cited by 60 publications

(57 citation statements)

References 22 publications

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“…However, in the XPS analysis, a clear oxidation reaction was generated in some metals, but N was removed from irradiated surfaces by API. Regarding the production of reactive species by N plasma, it appears that atomic N and water generate OH radicals 12,19) , and singlet O is generated secondarily 12,20) . When O-containing hydrocarbons covering TiO2 surfaces are removed by UV light treatment, Ti 4+ sites are exposed, which may promote interaction with such cationic sites 18) .…”

Section: Discussionmentioning

confidence: 99%

“…Atmospheric pressure plasmas have been adopted for surface treatments, such as cleaning, etching and deposition of thin surface layers 11) and, recently, the use of plasma has attracted attention as a novel method for deactivating bacteria on the surface of fresh foods and medical devices 12) . In dentistry, plasmas have been applied to adhesion of a polymethyl methacrylate (PMMA)-based resin block 13) , and that of resin composites to tooth substances 11) , titanium (Ti) and zirconia 14,15) for tooth restorations and implants.…”

Section: Introductionmentioning

confidence: 99%

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Changes in surface properties of dental alloys with atmospheric plasma irradiation

et al. 2020

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Chemical transitions after atmospheric pressure plasma irradiation were investigated by evaluating intermolecular attractions and atomic and molecular reactions. Gold, titanium and stainless-steel alloy samples were ground with #800 grit SiC waterproof paper and nitrogen gas atmospheric plasma irradiation was conducted. The surface free energies of the treated alloys were calculated and compared statistically. X-ray photoelectron spectroscopy analysis was performed.The surface free energies of all metal surfaces treated by plasma irradiation were 1.5-times higher than those of the untreated metals. The energy of the hydrogen bonding component increased, and all alloy surfaces were coated with metal oxide after only a short period of plasma irradiation. The surfaces oxidized by plasma exhibited a high active energy, mainly due to an increase in the hydrogen bonding component. Reactions with oxygen in the air were promoted on the clean surfaces with exposed reactive elements.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Changes in surface properties of dental alloys with atmospheric plasma irradiation

et al. 2020

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“…While the sterilizing effect of CAPs has been widely proven, the underlying processes are still not fully understood . Especially for bacteria and viruses located in liquid environments, the physical and chemical interactions of plasma, liquid, and gas‐phase are very challenging to understand …”

Section: Introductionmentioning

confidence: 99%

Effect of cold atmospheric plasmas on bacteria in liquid: The role of gas composition

Kaupe

Tschang

Birk

et al. 2019

Plasma Processes & Polymers

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In order to study the impact of different gas compositions on the bactericidal efficiency of cold atmospheric plasma jets, a device with a controlled atmosphere is built. Various mixtures of argon and helium with air are studied regarding their sterilizing effect on Escherichia coli in solution. Bacteria reduction rates react fundamentally different on addition of air in both gases. In case of helium, a distinct maximum for small admixtures is observed. Several diagnostic techniques were applied to the plasma. Stronger formation of peroxynitrous acid due to higher concentrations of hydrogen peroxide and nitrite is found to be responsible for the observed trends and differences. The presented findings are important for the development of efficient treatment devices.

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“…Recently, low temperature plasma (LTP) has attracted attention as a novel medical tool, and its efficacy at achieving bacterial inactivation [4][5][6][7], wound healing [8,9], and blood coagulation [10][11][12] has been investigated. The mechanism by which LTP induces blood coagulation is considered to involve reactions between reactive oxygen species (ROS) and blood coagulation factors [10], and a number of studies have investigated LTP-based blood coagulation in vivo and in vitro [13][14][15][16][17][18] According to these studies, LTP promotes the blood coagulation cascade or aggregates proteins by OH radicals and other reactive species.…”

Section: Introductionmentioning

confidence: 99%

Endoscopic Hemostasis in Porcine Gastrointestinal Tract Using CO2 Low-Temperature Plasma Jet

Kurosawa

Takamatsu

Kawano

et al. 2019

Journal of Surgical Research

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Background: Recently, atmospheric Low Temperature Plasma(LTP) has attracted attention as a novel medical tool that might be useful for achieving hemostasis. However, conventional plasma sources are too big for use with endoscopes, and the efficacy of LTP for achieving hemostasis in cases of gastrointestinal bleeding is difficult to investigate. In this study, to solve the problem, we developed a 3D printed LTP jet which has a diameter of 2.8 mm and metal body for endoscopic use And the characteristics, hemostasis efficacy and safety were investigated. Materials and Methods: As investigation of the basic characteristics of the developed plasma jet, the electron densities, gas temperatures, and reactive species were measured by emission spectroscopy and thermocouple To evaluate the efficacy of such hemostatic treatment, porcine gastrointestinal bleeding was treated with the device. In addition, to investigate the safety of such treatment, the CO LTP-treated tissue was compared with tissue that was treated with clipping-or argon plasma coagulation (APC)-based hemostasis for 5 days, and hematoxylin and eosin staining was used to evaluate tissue damage in the treated regions. Results: The measurement of emission spectroscopy, the power, and the electron density of various gas plasmas suggested that a high density (10 cm) LTP of CO was generated by the LTP jet and the gas temperature was 41.5°C at 3 mm from the outlet ofLTP. he CO LTP achieved hemostasis of oozing blood with 0±2 s. In addition, the CO LTP gave earlier recovery than clipping-or APC-based hemostasis, and the treated regions ha no damage by the CO LTP treatment. Conclusions: These results indicated that the developed LTP plasma jet has potential to be used for endoscopic hemostasis.

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Microbial Inactivation in the Liquid Phase Induced by Multigas Plasma Jet

Cited by 60 publications

References 22 publications

Changes in surface properties of dental alloys with atmospheric plasma irradiation

Changes in surface properties of dental alloys with atmospheric plasma irradiation

Effect of cold atmospheric plasmas on bacteria in liquid: The role of gas composition

Endoscopic Hemostasis in Porcine Gastrointestinal Tract Using CO2 Low-Temperature Plasma Jet

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