Cold atmospheric pressure plasma and low energy electron beam as alternative nonthermal decontamination technologies for dry food surfaces: A review

Hertwig, Christian; Meneses, Nicolás; Mathys, Alexander

doi:10.1016/j.tifs.2018.05.011

Cited by 167 publications

(81 citation statements)

References 85 publications

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“…The sporicidal action of different CAP systems has been demonstrated with different setups (Boudam et al ; Bourke et al ; Hertwig et al ). It is well accepted that the highest sporicidal effect can be achieved when spores are directly exposed to the plasma discharge (Moisan et al ).…”

Section: Discussionmentioning

confidence: 99%

Inactivation of bacterial endospores on surfaces by plasma processed air

Krämer

Hasse

Guist

et al. 2020

Journal of Applied Microbiology

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Aims In case of biological hazards and pandemics, personal protective equipment of rescue forces is currently manually decontaminated with harmful disinfectants, primarily peracetic acid. To overcome current drawbacks regarding supply, handling and disposal of chemicals, the use of plasma processed air (PPA) represents a promising alternative for surface decontamination on site. In this study, the sporicidal efficiency of a portable plasma system, designed for field applications, was evaluated. Methods and Results The developed plasma device is based on a dielectric barrier discharge (DBD) and operated with ambient air as process gas. PPA from the plasma nozzle was flushed into a treatment chamber (volume: 300 l) and bacterial endospores (Bacillus subtilis and Bacillus atrophaeus) dried on different surfaces were treated under variable conditions. Reductions in spores by more than 4 log10 were found within 3 min of PPA exposure. However, the presence of endospores in agglomerates or in an organic matrix as well as the complexity of the respective surface microstructure negatively affected the inactivation efficiency. When endospores were embedded in a dried protein matrix, mechanical wiping with swabs during exposure to PPA increased the inactivation effect significantly. Gaseous ozone alone did not provide a sporicidal effect. Significant spore inactivation was only obtained when water vapour was injected into the PPA stream. Conclusion The results show that endospores dried on surfaces can be reduced by several orders of magnitude within few minutes in a treatment chamber which is flushed with PPA from of a DBD plasma nozzle. Significance and Impact of the Study Plasma processed air generated on site by DBD plasma nozzles could be a suitable alternative for the disinfection of various surfaces in closed rooms.

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Section: Discussionmentioning

confidence: 99%

Inactivation of bacterial endospores on surfaces by plasma processed air

Krämer

Hasse

Guist

et al. 2020

Journal of Applied Microbiology

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“…Numerous convincing reports are indicating the remarkable functions of cold plasma as a novel emerging technology in various multidisciplinary fields of sciences and industries, especially food and medicine . However, there are still many knowledge gaps in the function and commercialization of cold plasma to the pursuit of knowledge and goals in plant science and agriculture.…”

Section: Introductionmentioning

confidence: 99%

Seed priming with cold plasma improved seedling performance, secondary metabolism, and expression of deacetylvindoline O‐acetyltransferase gene in Catharanthus roseus

Ghasempour

Iranbakhsh

Ebadi

et al. 2020

Contributions to Plasma Physics

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The plasma-primed seeds of Catharanthus roseus were cultured in a hormone-free culture medium under sterile conditions. Plasma of 30 or 60 s improved root length (mean = 41.4%) and biomass (mean = 47%), whereas plasma of 90 s delayed plant growth. The plasma treatments enhanced concentrations of photosynthetic pigments and soluble phenols. Plasma of 90 s increased the proline level. With a similar trend, plasma priming induced activities of phenylalanine ammonia-lyase, catalase (about twofold) and peroxidase (31%) enzymes. Plasma also upregulated the expressions of deacetylvindoline O-acetyltransferase gene by an average of 7.8 times. Similarly, the plasma-treated seedlings contained higher concentrations of alkaloids (mean = 72%). Here, molecular evidence is provided on the plasma-associated modifications in secondary metabolism. K E Y W O R D S applied physics, Catharanthus roseus, cold plasma, gene expression, secondary metabolism, seed priming 1

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“…Since many seed-borne diseases are associated with the infection of a flowering part during the pre-harvest period, the pre-harvest control of diseases might be critical for obtaining healthy and high-quality seeds. However, the treatment of post-harvest seeds is also prevalent for controlling seed-borne diseases (Hertwig et al, 2018). Seed treatment for preventing pathogenic diseases focuses on the inactivation of pathogens that are present on the surface and inside of infected seeds.…”

Section: Seed-borne Diseasesmentioning

confidence: 99%

“…The mechanisms of seed disinfection by plasma are not yet completely elucidated. Studies have demonstrated the harmful effects of plasma-generated reactive species, charged species, and UV photons on microbial cells (reviewed in Hertwig et al, 2018). Radicals and excited molecules generated from plasma can erode the surface of microbial cells through etching and, thus, lead to their inactivation (Moisan et al, 2001).…”

Section: Seed-borne Diseasesmentioning

confidence: 99%

Plant Disease Control by Non-Thermal Atmospheric-Pressure Plasma

et al. 2020

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Disease stresses caused by pathogenic microorganisms are increasing, probably because of global warming. Conventional technologies for plant disease control have often revealed their limitations in efficiency, environmental safety, and economic costs. There is high demand for improvements in efficiency and safety. Non-thermal atmospheric-pressure plasma has demonstrated its potential as an alternative tool for efficient and environmentally safe control of plant pathogenic microorganisms in many studies, which are overviewed in this review. Efficient inactivation of phytopathogenic bacterial and fungal cells by various plasma sources under laboratory conditions has been frequently reported. In addition, plasma-treated water shows antimicrobial activity. Plasma and plasma-treated water exhibit a broad spectrum of efficiency in the decontamination and disinfection of plants, fruits, and seeds, indicating that the outcomes of plasma treatment can be significantly influenced by the microenvironments between plasma and plant tissues, such as the surface structures and properties, antioxidant systems, and surface chemistry of plants. More intense studies are required on the efficiency of decontamination and disinfection and underlying mechanisms. Recently, the induction of plant tolerance or resistance to pathogens by plasma (so-called "plasma vaccination") is emerging as a new area of study, with active research ongoing in this field.

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Cold atmospheric pressure plasma and low energy electron beam as alternative nonthermal decontamination technologies for dry food surfaces: A review

Cited by 167 publications

References 85 publications

Inactivation of bacterial endospores on surfaces by plasma processed air

Inactivation of bacterial endospores on surfaces by plasma processed air

Seed priming with cold plasma improved seedling performance, secondary metabolism, and expression of deacetylvindoline O‐acetyltransferase gene in Catharanthus roseus

Plant Disease Control by Non-Thermal Atmospheric-Pressure Plasma

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