期刊
CHINESE PHYSICS B
卷 24, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/24/8/085201
关键词
atmospheric-pressure plasma; reactive oxygen species; inactivation efficiency
资金
- Natural Science Foundation of Fujian Province, China [2014J01025]
- National Natural Science Foundation of China [11275261]
- Fujian Provincial Key Laboratory for Plasma and Magnetic Resonance, China
In this paper, we report on the contrastive analysis of inactivation efficiency of E. coli cells in solution with different disinfection methods. Compared with the hydrogen peroxide solution and the ozone gas, the atmospheric-pressure He plasma can completely kill the E. coli cells in the shortest time. The inactivation efficiency of E. coli cells in solution can be well described by using the chemical reaction rate model. X-ray photoelectron spectroscopy (XPS) analysis shows that the C-O or C=O content of the inactivated E. coli cell surface by plasma is predominantly increased, indicating the quantity of oxygen-containing species in plasma is more than those of two other methods, and then the C-C or C-H bonds can be broken, leading to the etching of organic compounds. Analysis also indicates that plasma-generated species can play a crucial role in the inactivation process by their direct reactions or the decompositions of reactive species, such as ozone into OH radicals in water, then reacting with E. coli cells.
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