期刊
FOOD AND BIOPROCESS TECHNOLOGY
卷 10, 期 4, 页码 650-661出版社
SPRINGER
DOI: 10.1007/s11947-016-1847-2
关键词
Gliding arc discharge microplasma; Decontamination; E. coli; S.epidermidis; Stainless steel; Silicone; Polyethylene terephthalate
资金
- Scientific and Technological Research Council of Turkey (TUBITAK) [MAG 112M740]
- Korean Scientific Cooperation Network
- European Research Area (KORANET) Joint Call on Green Technologies project: KORANET (ENV-BIO-GA)
- COST Actions [MP1101, TD1208]
- LUT research fund
In this study, a gliding arc discharge (GAD) microplasma system was designed, and its decontamination effect was investigated on stainless steel (SS), silicone (Si), and polyethylene terephthalate (PET) surfaces artificially contaminated with 8.15 +/- 0.28 log cfu/mL of Escherichia coli and 6.18 +/- 0.21 log cfu/mL of Staphylococcus epidermidis. Each of the contaminated surfaces was treated with high purity air (79% nitrogen and 21% oxygen) or nitrogen plasmas for 1-10 min at varying rates of gas flow. Significant reductions of 3.76 +/- 0.28, 3.19 +/- 0.31, and 2.95 +/- 0.94 log cfu/mL in S. epidermidis, and 2.72 +/- 0.82, 4.43 +/- 0.14, and 3.18 +/- 0.96 log cfu/mL in E. coli on SS, Si, and PET surfaces, respectively, were achieved after 5 min of plasma treatment by using nitrogen as the plasma forming gas (p < 0.05). The temperature changes of each surface during plasma generation were lower than 35 degrees C and were not affected by the type of plasma forming gas. Additionally, morphological changes in the structure of E. coli and S. epidermidis after GAD plasma treatments were demonstrated using scanning electron microscopy (SEM).
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