Preferential production of reactive species and bactericidal efficacy of gas-liquid plasma discharge

Shen, Jie; Zhang, Hao; Xu, Zimu; Zhang, Zelong; Cheng, Cheng; Ni, Guohua; Liu, Yan; Meng, Yuedong; Xia, Weidong; Chu, Paul K.

doi:10.1016/j.cej.2019.01.018

Cited by 130 publications

(77 citation statements)

References 52 publications

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“…Several studies propose that species such as OH, NO, NO 2 , NO 3 , and ONOOH/ONOO − are formed in PAW and are mainly responsible for bacterial inactivation by oxidizing lipids, DNA, and proteins. [ 35‐38 ] This has been shown both in air plasma [ 39 ] and in PAW. [ 28 ] For example, it was demonstrated that nitrate and the reduced form nitrite exhibit antimicrobial activity by inhibiting active transport, oxygen uptake, and oxidative phosphorylation in aerobic bacteria.…”

Section: Discussionmentioning

confidence: 92%

Microbial decontamination of chicken using atmospheric plasma bubbles

Mai‐Prochnow

Alam

Zhou

et al. 2020

Plasma Processes & Polymers

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In this study, we demonstrate that atmospheric air plasma bubbles are an effective, energy‐efficient, residue‐free alternative to current decontamination techniques. Five to fifteen minutes of plasma‐bubble treatments of inoculated chicken skin led to a significant reduction in colony‐forming units (CFUs). We show that the activation efficiency is dependent on the plasma discharge frequency, with a higher one (2,000 Hz) leading to a higher CFU reduction (1.4 log) as compared with a lower (0.3 log) reduction at 1,000 Hz. Scanning electron microscopy pictures of treated bacteria reveal damage to the cells. An evaluation of the physicochemical properties of the generated plasma‐activated water revealed an increase in conductivity and in ozone, nitrite, nitrate, hydroxyl, and peroxide concentrations with higher frequencies, all contributing to the observed antimicrobial effect.

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Section: Discussionmentioning

confidence: 92%

Microbial decontamination of chicken using atmospheric plasma bubbles

Mai‐Prochnow

Alam

Zhou

et al. 2020

Plasma Processes & Polymers

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“…Similarly, Ulbin‐Figlewicz, Brychcy, and Jarmoluk (2015) and Kim et al (2011) found that the total number of microorganisms after plasma treatment decreased by increasing the voltage level and prolonging the discharge duration. The microbial inactivation observed after plasma exposure has been attributed to the effect of the various reactive species (plasma ions and cell interactions) generated during the discharge (Misra et al, 2019; Shen et al, 2019). The specific types of reactive species, such as oxygen atoms, ozone, metastable oxygen molecules, peroxide, superoxide, and hydroxyl radicals, created by plasma are bactericidal (Lopez et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

“…the various reactive species (plasma ions and cell interactions) generated during the discharge(Misra et al, 2019;Shen et al, 2019). The specific types of reactive species, such as oxygen atoms, ozone, metastable oxygen molecules, peroxide, superoxide, and hydroxyl radicals, created by plasma are bactericidal(Lopez et al, 2019).…”

mentioning

confidence: 99%

Optimization of decontamination conditions for Aspergillus flavus inoculated to military rations snack and physicochemical properties with atmospheric cold plasma

Bagheri

Abbaszadeh

Salari

2020

Journal of Food Safety

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In this study, the effectiveness of ACP in inactivating Aspergillus flavus inoculated to military rations snack using response surface methodology (RSM) was investigated. Additionally, the effect of this treatment on the total count and yeast-mold count, as well as some quality properties of military rations snack, was examined. RSM was applied to study the voltage effects (5-15 kV), the distance between ACP emitter and sample (3-7 cm), and different treatment time (2-10 min) on the physicochemical properties of the military rations snack. Increasing voltage and time, together with reducing distance, caused a decrease in A. flavus, total count, yeast and mold count, total aflatoxin, as well as color difference. The peroxide value also increased with increasing voltage levels. The optimum conditions for treated military rations snack by ACP are as follows: a system voltage of 9 kV, a distance of 3 cm between the sample and the emitter, and a time of 6 min. Under these conditions, the responses, including the utmost reduction of 4.31 log CFU/g for the total count, 4.64 log CFU/g for yeast-mold count, and 2.98 log CFU/g for A. flavus were found from starting level of 5.2, 2, and 3.1 log CFU/g, respectively. It was found that snack samples had a 3.66% decrease in moisture content, 76.13% decrease in total aflatoxin, 3.01% increase in color difference, and 0.22 meq O 2 .kg/oil increase in peroxide value as a result of ACP application. ACP has the potential to increase microbiological safety by maintaining desirable quality properties in military rations snack.

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“…Preferential production of RONS by air and oxygen plasma in liquid was also related to bactericidal efficacy of gas-liquid plasma discharge 48 . Direct oxygen plasma treatment showed a higher inactivation effect against S. aureus cells due to the higher concentration of OH radicals, although the total amount of reactive species was less than that of the air plasma in the liquid.…”

Section: Discharge Over the Water Surfacementioning

confidence: 95%

“…Direct oxygen plasma treatment showed a higher inactivation effect against S. aureus cells due to the higher concentration of OH radicals, although the total amount of reactive species was less than that of the air plasma in the liquid. By comparison, in indirect treatment (PAW), the inactivation effect of the air-PAW was better than that of oxygen-PAW mainly due to formation of nitrogen-based reactive species such as HNO 2 , HNO 3 , ONOOH and O 2 NOOH in the liquid 48 .…”

Section: Discharge Over the Water Surfacementioning

confidence: 96%

Interactions of plasma-activated water with biofilms: inactivation, dispersal effects and mechanisms of action

Mai‐Prochnow

Zhou

Zhang

et al. 2021

npj Biofilms Microbiomes

141

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Biofilms have several characteristics that ensure their survival in a range of adverse environmental conditions, including high cell numbers, close cell proximity to allow easy genetic exchange (e.g., for resistance genes), cell communication and protection through the production of an exopolysaccharide matrix. Together, these characteristics make it difficult to kill undesirable biofilms, despite the many studies aimed at improving the removal of biofilms. An elimination method that is safe, easy to deliver in physically complex environments and not prone to microbial resistance is highly desired. Cold atmospheric plasma, a lightning-like state generated from air or other gases with a high voltage can be used to make plasma-activated water (PAW) that contains many active species and radicals that have antimicrobial activity. Recent studies have shown the potential for PAW to be used for biofilm elimination without causing the bacteria to develop significant resistance. However, the precise mode of action is still the subject of debate. This review discusses the formation of PAW generated species and their impacts on biofilms. A focus is placed on the diffusion of reactive species into biofilms, the formation of gradients and the resulting interaction with the biofilm matrix and specific biofilm components. Such an understanding will provide significant benefits for tackling the ubiquitous problem of biofilm contamination in food, water and medical areas.

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Preferential production of reactive species and bactericidal efficacy of gas-liquid plasma discharge

Cited by 130 publications

References 52 publications

Microbial decontamination of chicken using atmospheric plasma bubbles

Microbial decontamination of chicken using atmospheric plasma bubbles

Optimization of decontamination conditions for Aspergillus flavus inoculated to military rations snack and physicochemical properties with atmospheric cold plasma

Interactions of plasma-activated water with biofilms: inactivation, dispersal effects and mechanisms of action

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