Comparison of pulsed corona plasma and pulsed electric fields for the decontamination of water containing Legionella pneumophila as model organism

Banaschik, Robert; Burchhardt, Gerhard; Zocher, Katja; Hammerschmidt, Sven; Kolb, Juergen F.; Weltmann, Klaus‐Dieter

doi:10.1016/j.bioelechem.2016.05.006

Cited by 22 publications

(6 citation statements)

References 45 publications

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“…Besides, no observable damage to their cell walls was found [5]. Conversely, these pulsed electric field exposures are known to be adequate for the electroporation of mammalian cells or bacteria [31][32][33]. Electroporation is known as a consequence of the charging of cell membranes.…”

Section: Discussionmentioning

confidence: 99%

Mechanism of microalgae disintegration by spark discharge treatment for compound extraction

Zocher

Rataj

Weltmann

et al. 2020

J. Phys. D: Appl. Phys.

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Microalgae possess a cell wall with remarkable physical and chemical strength, which has proved to be a bottleneck for extraction techniques. With the application of spark discharges instigated by 100-ns high voltage pulses, a novel method was established that was found to be effective and yet gentle for the extraction of sensitive, especially heat-sensitive, compounds. The spark, which was ignited directly in the submerged algae suspension, is characterised by several physical and chemical processes that might promote a successful disintegration of the cells. Among other characteristics, the conceivably most destructive mechanism, i.e. strong shockwaves, was examined with schlieren diagnostics to evaluate associated pressures. The results were compared with the tensile strength, determined by atomic force microscopy, of Chlorella vulgaris, which was chosen as model organism. A shockwave pressure of 500 MPa in the close vicinity of the discharge by far exceeded the elasticity modulus of the algae with 13.95 MPa, confirming the potential of mechanically breaking the cell wall. At the same time, bulk temperatures could be maintained close to room temperature by adjusting the operating parameters for the spark-application, hence, especially encouraging the extraction of thermally unstable intracellular substances.

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Section: Discussionmentioning

confidence: 99%

Mechanism of microalgae disintegration by spark discharge treatment for compound extraction

Zocher

Rataj

Weltmann

et al. 2020

J. Phys. D: Appl. Phys.

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“…The bactericidal mechanism of CAP is also considered to involve high electric fields and discharged particles (Banaschik et al 2016 ; Modic et al 2017 ), and the formation of high electric fields and discharged particles are considered to be closely linked to their bactericidal effects. Charged and neutral particles are formed during CAP generation, and these particles induce a strong local electric field during propagation (Dezest et al 2017 ).…”

Section: Bacteriostatic Mechanism Of Each Component Of Capmentioning

confidence: 99%

Mechanisms of bacterial inhibition and tolerance around cold atmospheric plasma

Zhang,

Han

2023

Appl Microbiol Biotechnol

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The grim situation of bacterial infection has undoubtedly become a major threat to human health. In the context of frequent use of antibiotics, a new bactericidal method is urgently needed to fight against drug-resistant bacteria caused by non-standard use of antibiotics. Cold atmospheric plasma (CAP) is composed of a variety of bactericidal species, which has excellent bactericidal effect on microbes. However, the mechanism of interaction between CAP and bacteria is not completely clear. In this paper, we summarize the mechanisms of bacterial killing by CAP in a systematic manner, discuss the responses of bacteria to CAP treatment that are considered to be related to tolerance and their underlying mechanisms, review the recent advances in bactericidal applications of CAP finally. This review indicates that CAP inhibition and tolerance of survival bacteria are a set of closely related mechanisms and suggests that there might be other mechanisms of tolerance to survival bacteria that had not been discovered yet. In conclusion, this review shows that CAP has complex and diverse bactericidal mechanisms, and has excellent bactericidal effect on bacteria at appropriate doses. Key points • The bactericidal mechanism of CAP is complex and diverse. • There are few resistant bacteria but tolerant bacteria during CAP treatment. • There is excellent germicidal effect when CAP in combination with other disinfectants.

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“…Two disinfection methods were proposed in [68] for decontamination of Legionella pneumophila microbes. For pulsed corona disinfection method, high voltage pulses with an amplitude of +80 kV, 20 Hz frequency, 140 ns pulse duration, and 20 ns rise time were generated by a Marx-Bank pulse generator to produce plasma at the electrode/liquid interface using a tungsten high voltage electrode.…”

Section: B Legionella Pneumophila Microbes Inactivationmentioning

confidence: 99%

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

2019

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Water quality improvement and collecting safe water are two of the paramount concerns in today's world. Numerous water treatment and pollutant removal processes are introduced that vary with the type of pollutants. Among the proposed pollutant degradation methods, pulsed power is one of the effective methods that can be applied not only to degrade a wide range of contaminants but also to address the environmental issues associated with water treatment chemicals. The effectiveness of the pulsed power technology in water treatment was studied for a wide range of pollutants including microorganisms, nutrient pollution, emerging pollutants, and organic pollutants. This paper presents a review of pulsed power systems developed for organic and inorganic pollutants degradation in different water treatment applications. Also, it presents the effectiveness of several factors like the electrical characteristics of the pulse voltages and treatment time on degradation rates of different pollutants.

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Comparison of pulsed corona plasma and pulsed electric fields for the decontamination of water containing Legionella pneumophila as model organism

Cited by 22 publications

References 45 publications

Mechanism of microalgae disintegration by spark discharge treatment for compound extraction

Mechanism of microalgae disintegration by spark discharge treatment for compound extraction

Mechanisms of bacterial inhibition and tolerance around cold atmospheric plasma

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

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