Decontamination of Streptococci biofilms and Bacillus cereus spores on plastic surfaces with DC and pulsed corona discharges

被引:28
|
作者
Kovalova, Zuzana [1 ]
Tarabova, Katarina [2 ]
Hensel, Karol [1 ]
Machala, Zdenko [1 ]
机构
[1] Comenius Univ, Fac Math Phys & Informat, Div Environm Phys, Bratislava 84248, Slovakia
[2] Comenius Univ, Fac Math Phys & Informat, Div Biomed Phys, Bratislava 84248, Slovakia
来源
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS | 2013年 / 61卷 / 02期
关键词
DIELECTRIC BARRIER DISCHARGE; STERILIZATION;
D O I
10.1051/epjap/2012120449
中图分类号
O59 [应用物理学];
学科分类号
摘要
Cold air plasmas of DC and pulsed corona discharges: positive streamers and negative Trichel pulses were used for bio-decontamination of Streptococci biofilm and Bacillus cereus spores on polypropylene plastic surfaces. The reduction of bacterial population (evaluated as log(10)) in the biofilm on plastic surfaces treated by DC corona reached 2.4 logs with 10 min treatment time and 3.3 logs with 2 min treatment time with water spraying. The enhancement of plasma biocidal effects on the biofilm by electro-spraying of water through a hollow needle high-voltage electrode was investigated. No significant polarity effect was found with DC corona. Pulsed corona was demonstrated slightly more bactericidal for spores, especially in the negative polarity where the bacterial population reduction reached up to 2.2 logs at 10 min exposure time.
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页数:7
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