Assessment of the roles of various inactivation agents in an argon-based direct current atmospheric pressure cold plasma jet
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871 (China)
- College of Engineering, Peking University, Beijing 100871 (China)
- Department of Applied Science and Technology, Saint Peter's College, New Jersey 07031 (United States)
- Department of Applied Physics, Polytechnic Institute of New York University, New York 11201 (United States)
Three types of gases, pure argon (99.999%), argon with 2% oxygen, and argon with 2% oxygen and 10% nitrogen were used as operating gases of a direct current atmospheric pressure cold plasma jet to inactivate Staphylococcus aureus (S. aureus) suspended in a liquid. The inactivation efficacies for the plasma jets operating in the three gases decrease from Ar/O{sub 2}(2%) to Ar/O{sub 2}(2%)/N{sub 2}(10%) to pure Ar. Optical emission spectroscopy, electron spin resonance spectroscopy, high performance liquid chromatography, and atomic absorption spectrophotometry were employed to identify and monitor the reactive species in the plasma-liquid system for the three operating gases and revealed the presence of O, {sup 1}O{sub 2}, OH, NO, H{sub 2}O{sub 2}, O{sub 3}, and NO{sub 3}{sup -}/NO{sub 2}{sup -} as well as Cu{sup +}/Cu{sup 2+}. The S. aureus inactivation results indicate that atomic oxygen (O) is the key inactivation agent, while other species play a lesser role in the inactivation progress studied here.
- OSTI ID:
- 22089246
- Journal Information:
- Journal of Applied Physics, Vol. 111, Issue 12; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ARGON
ATOMIZATION
COLD PLASMA
COPPER IONS
ELECTRON SPIN RESONANCE
EMISSION SPECTROSCOPY
HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY
HYDROGEN PEROXIDE
INACTIVATION
IONIZING RADIATIONS
MIXTURES
NITRIC OXIDE
NITROGEN COMPOUNDS
OXYGEN
PARAMAGNETISM
STAPHYLOCOCCUS
SUSPENSIONS