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A low power flexible dielectric barrier discharge disinfects surfaces and improves the action of hydrogen peroxide.

ABSTRACT: There is an urgent need for disinfection and sterilization devices accessible to the public that can be fulfilled by innovative strategies for using cold atmospheric pressure plasmas. Here, we demonstrate a successful novel combination of a flexible printed circuit design of a dielectric barrier discharge (flex-DBD) with an environmentally safe chemical reagent for surface decontamination from bacterial contaminants. Flex-DBD operates in ambient air, atmospheric pressure, and room temperature without any additional gas flow at a power density not exceeding 0.5 W/cm². The flex-DBD activation of a 3% hydrogen peroxide solution results in the reduction in the bacterial load of a surface contaminant of?>?6log₁₀ in 90 s, about 3log₁₀ and 2log₁₀ better than hydrogen peroxide alone or the flex-DBD alone, respectively, for the same treatment time. We propose that the synergy between plasma and hydrogen peroxide is based on the combined action of plasma-generated OH^· radicals in the hydrogen peroxide solution and the reactive nitrogen species supplied by the plasma effluent. A scavenger method verified a significant increase in OH^· concentration due to plasma treatment. Novel in-situ FTIR absorption spectra show the presence of O₃, NO₂, N₂O, and other nitrogen species. Ozone dissolving in the H₂O₂ solution can effectively generate OH^· through a peroxone process. The addition of the reactive nitrogen species increases the disinfection efficiency of the hydroxyl radicals and other oxygen species. Hence, plasma activation of a low concentration hydrogen peroxide solution, using a hand-held flexible DBD device results in a dramatic improvement in disinfection.

SUBMITTER: Gershman S

PROVIDER: S-EPMC7907379 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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A low power flexible dielectric barrier discharge disinfects surfaces and improves the action of hydrogen peroxide.

Gershman Sophia S Harreguy Maria B MB Yatom Shurik S Raitses Yevgeny Y Efthimion Phillip P Haspel Gal G

Scientific reports 20210225 1

There is an urgent need for disinfection and sterilization devices accessible to the public that can be fulfilled by innovative strategies for using cold atmospheric pressure plasmas. Here, we demonstrate a successful novel combination of a flexible printed circuit design of a dielectric barrier discharge (flex-DBD) with an environmentally safe chemical reagent for surface decontamination from bacterial contaminants. Flex-DBD operates in ambient air, atmospheric pressure, and room temperature wi ...[more]

PMID: 33633257

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Project description:The proliferation of fibroblasts and myofibroblast differentiation are crucial in wound healing and wound closure. Impaired wound healing is often correlated with chronic bacterial contamination of the wound area. A new promising approach to overcome wound contamination, particularly infection with antibiotic-resistant pathogens, is the topical treatment with non-thermal "cold" atmospheric plasma (CAP). Dielectric barrier discharge (DBD) devices generate CAP containing active and reactive species, which have antibacterial effects but also may affect treated tissue/cells. Moreover, DBD treatment acidifies wound fluids and leads to an accumulation of hydrogen peroxide (H2O2) and nitric oxide products, such as nitrite and nitrate, in the wound. Thus, in this paper, we addressed the question of whether DBD-induced chemical changes may interfere with wound healing-relevant cell parameters such as viability, proliferation and myofibroblast differentiation of primary human fibroblasts. DBD treatment of 250 ?l buffered saline (PBS) led to a treatment time-dependent acidification (pH 6.7; 300 s) and coincidently accumulation of nitrite (~300 ?M), nitrate (~1 mM) and H2O2 (~200 ?M). Fibroblast viability was reduced by single DBD treatments (60-300 s; ~77-66%) or exposure to freshly DBD-treated PBS (60-300 s; ~75-55%), accompanied by prolonged proliferation inhibition of the remaining cells. In addition, the total number of myofibroblasts was reduced, whereas in contrast, the myofibroblast frequency was significantly increased 12 days after DBD treatment or exposure to DBD-treated PBS. Control experiments mimicking DBD treatment indicate that plasma-generated H2O2 was mainly responsible for the decreased proliferation and differentiation, but not for DBD-induced toxicity. In conclusion, apart from antibacterial effects, DBD/CAP may mediate biological processes, for example, wound healing by accumulation of H2O2. Therefore, a clinical DBD treatment must be well-balanced in order to avoid possible unwanted side effects such as a delayed healing process.

Dataset Information

A low power flexible dielectric barrier discharge disinfects surfaces and improves the action of hydrogen peroxide.

Publications

A low power flexible dielectric barrier discharge disinfects surfaces and improves the action of hydrogen peroxide.

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