Understanding the respective roles of UV photons and radicals in cold plasma sterilization

2003 ◽  
Author(s):  
M. Moisan ◽  
B. Saoudi ◽  
J. Pelletier ◽  
J. Barbeau
Keyword(s):  
Cold Plasma ◽  
Plasma Sterilization ◽  
Uv Photons

The respective roles of UV photons and oxygen atoms in plasma sterilization at reduced gas pressure: the case of N/sub 2/-O/sub 2/ mixtures

2002 ◽  
Vol 30 (4) ◽  
pp. 1429-1436 ◽  
Author(s):  
N. Philip ◽  
B. Saoudi ◽  
M.-C. Crevier ◽  
M. Moisan ◽  
J. Barbeau ◽  
...  
Keyword(s):  
Gas Pressure ◽  
Plasma Sterilization ◽  
Uv Photons ◽  
Oxygen Atoms

Modeling the inactivation of Bacillus subtilis spores during cold plasma sterilization

2019 ◽  
Vol 52 ◽  
pp. 334-342 ◽  
Author(s):  
Gabriella Mendes-Oliveira ◽  
Jeanette L. Jensen ◽  
Kevin M. Keener ◽  
Osvaldo H. Campanella
Keyword(s):  
Bacillus Subtilis ◽  
Cold Plasma ◽  
Plasma Sterilization

Plasma sterilization. Methods and mechanisms

2002 ◽  
Vol 74 (3) ◽  
pp. 349-358 ◽  
Author(s):  
Michel Moisan ◽  
Jean Barbeau ◽  
Marie-Charlotte Crevier ◽  
Jacques Pelletier ◽  
Nicolas Philip ◽  
...  
Keyword(s):  
Significant Contribution ◽  
Genetic Material ◽  
Reactive Species ◽  
Gas Pressure ◽  
Survival Curves ◽  
Plasma Sterilization ◽  
Physicochemical Processes ◽  
Inactivation Process ◽  
Uv Photons ◽  
Oxygen Atoms

Utilizing a plasma to achieve sterilization is a possible alternative to conventional sterilization means as far as sterilization of heat-sensitive materials and innocuity of sterilizing agents are concerned. A major issue of plasma sterilization is the respective roles of ultraviolet (UV) photons and reactive species such as atomic and molecular radicals. At reduced gas pressure (£10 torr) and in mixtures containing oxygen, the UV photons dominate the inactivation process, with a significant contribution of oxygen atoms as an erosion agent. Actually, as erosion of the spore progresses, the number of UV photons successfully interacting with the genetic material increases. The different physicochemical processes at play during plasma sterilization are identified and analyzed, based on the specific characteristics of the spore survival curves.

scholarly journals The State of Research on Antimicrobial Activity of Cold Plasma

2019 ◽  
Vol 68 (2) ◽  
pp. 153-164 ◽  
Author(s):  
IWONA NIEDŹWIEDŹ ◽  
ADAM WAŚKO ◽  
JOANNA PAWŁAT ◽  
MAGDALENA POLAK-BERECKA
Keyword(s):  
Cold Plasma ◽  
New Technology ◽  
Sewage Treatment ◽  
Chemical Properties ◽  
High Energy ◽  
Food Preservation ◽  
Alternative Methods ◽  
Number Of Microorganisms ◽  
State Of Research ◽  
Uv Photons

Microbiological contamination is a big challenge to the food industry, medicine, agriculture, and environmental protection. For this reason, scientists are constantly looking for alternative methods of decontamination, which ensure the effective elimination of unwanted biological agents. Cold plasma is a new technology, which due to its unique physical and chemical properties becomes a point of interest to a growing group of researchers. The previously conducted experiments confirm its effective action, e.g. in the disinfection of skin wounds, air, and sewage treatment, as well as in food preservation and decontamination. The reactive compounds present in the plasma: high-energy electrons, ionized atoms and molecules, and UV photons are the key factors that cause an effective reduction in the number of microorganisms. The mechanism and effectiveness of the cold plasma are complex and depend on the process parameters, environmental factors and the type and properties of the microorganisms that are to be killed. This review describes the current state of knowledge regarding the effectiveness of the cold plasma and characterizes its interaction with various groups of microorganisms based on the available literature data.

scholarly journals Cold Plasma Sterilization of Open Wounds: Live Rat Model

2011 ◽  
Vol 1 (2) ◽  
pp. 109-114 ◽  
Author(s):  
Danil Dobrynin ◽  
Kimberly Wasko ◽  
Gary Friedman ◽  
Alexander A. Fridman ◽  
Gregory Fridman
Keyword(s):  
Rat Model ◽  
Cold Plasma ◽  
Plasma Sterilization

Magnetic field enhanced cold plasma sterilization

2020 ◽  
Vol 17-18 ◽  
pp. 100092
Author(s):  
Madeline A. Mackinder ◽  
Keliang Wang ◽  
Bocong Zheng ◽  
Maheshwar Shrestha ◽  
Qi Hua Fan
Keyword(s):  
Magnetic Field ◽  
Cold Plasma ◽  
Plasma Sterilization

Lethal and Sublethal Effect of a Dielectric Barrier Discharge Atmospheric Cold Plasma on Staphylococcus aureus

2017 ◽  
Vol 80 (6) ◽  
pp. 928-932 ◽  
Author(s):  
Xinyu Liao ◽  
Qisen Xiang ◽  
Donghong Liu ◽  
Shiguo Chen ◽  
Xingqian Ye ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Food Safety ◽  
Dielectric Barrier Discharge ◽  
Cold Plasma ◽  
Barrier Discharge ◽  
Sublethal Effect ◽  
Dielectric Barrier ◽  
Selective Media ◽  
Plasma Sterilization ◽  
Sublethal Injury

ABSTRACT The lethal and sublethal effect of a dielectric barrier discharge atmospheric cold plasma on Staphylococcus aureus were investigated by nonselective and selective media. The inactivation level and sublethally injured proportions of S. aureus cells by dielectric barrier discharge atmospheric cold plasma depended on the treatment times (0, 5, 15, and 45 s), applied input powers (40, 50, and 60 W), and gap distances (2, 4, and 6 mm). Under weak conditions (e.g., 5 s, 40 W, and 6 mm), the occurrence of inactivation and sublethal injury of S. aureus showed a relatively low level. Strong treatment (e.g., 45 s, 60 W, and 2 mm) resulted in highly an inactivated rate, but with small fractions of sublethally injured S. aureus cells. Mild action of cold plasma induced both a large inactivation and a sublethal injury of S. aureus. Therefore, it is significant to optimize the processing of cold plasma sterilization in practice to ensure food safety.

scholarly journals Design of a Switching Flyback Transformer as High Voltage and Frequency Power Supply for Raw Milk Cold Plasma Sterilization

2020 ◽  
Vol 1 (3) ◽  
pp. 230-236
Author(s):  
Muhamad Ibnu Fajar ◽  
Elfahra Casanza Amalda ◽  
Muhammad Ali Akram Syah ◽  
Nurussa’adah
Keyword(s):  
Thermal Plasma ◽  
Thermal Equilibrium ◽  
Cold Plasma ◽  
Raw Milk ◽  
Milk Quality ◽  
Positive Electrode ◽  
Fast Method ◽  
Temperature Plasma ◽  
Plasma Sterilization ◽  
Non Thermal Plasma

Plasma is one of the four fundamentals states of matter other than solid, liquid and gas. In terms of temperature, plasma can be classified into Hot Plasma occurs in thermal equilibrium, Thermal Plasma occurs in non-thermal equilibrium, Cold Plasma occurs in non-thermal equilibrium Cold plasma is an ultra-fast method of sterilization that operates under ambient temperatures (ideal for thermolabile products) at a low running cost and is environment-friendly. Therefore, technology is needed to solve the problem through the innovation of a milk sterilization machine with the principle of non-thermal plasma sterilization by utilizing plasma technology to reduce microbial contamination. The output frequency and voltage are determined through software simulation using voltmeter, oscilloscope, and counter timer. After 220VAC supplies a voltage step down and rectifier circuit to produce a 12VDC output voltage to supply the Switching circuit voltage and the Flyback Transformer driver. Rated voltage and frequency reach 20kV 15kHz.The positive wire from the Flyback Transformer is connected to the acrylic box filled with water (positive electrode) and the ground wire is connected to another acrylic sheet (ground electrode. The milk medium to be sterilized can be placed on the positive electrode or between the ground and positive electrodes. Non-thermal plasma has an effective ability to decontaminate bacteria. This is because plasma is composed of a mixture of ionized particles, reactive radical molecules, and also ultraviolet Schematic circuit design has been successfully simulated. Acrylic sterilization media designs can be used to generate plasma. The mechanism of bacterial sterilization in milk is by the activity of inhibiting bacterial biofilms which can lead to bacterial DNA damage through reactive species in the non-thermal plasma used. Milk quality testing is carried out based on comparison of supporting literature with milk quality requirements according to SNI 3950: 2014.

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