标题 |
Inactivation and injury of Escherichia coli O157:H7 and Staphylococcus aureus by pulsed electric fields
脉冲电场对大肠杆菌O157:H7和金黄色葡萄球菌的灭活和损伤
相关领域
金黄色葡萄球菌
大肠杆菌
微生物
微生物学
电场
脉搏(音乐)
化学
细菌
生物
生物化学
物理
遗传学
量子力学
探测器
基因
光学
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其它 | Two pathogenic microorganisms Escherichia coli O157:H7 and Staphylococcus aureus, suspended in peptone solution (0.1% w/v) were treated with 12, 14, 16 and 20 kV/cm electric field strengths with different pulse numbers up to 60 pulses. Pulsed electric field (PEF) treatment at 20 kV/cm with 60 pulses provided nearly 2 log reduction in viable cell counts of E. coli O157:H7 and S. aureus. S. aureus cells were slightly more resistant than E.coli O157:H7 cells. The results related to the effect of initial cell concentration of E. coli O157:H7 on the PEF inactivation showed that more inactivation was obtained by decreasing initial cell concentration. Any possible injury by PEF was also investigated after applying 20 kV/cm electric field to the microorganisms. As a result, it was determined that there was 35.92 to 43.36% injury in E. coli O157:H7 cells, and 17.26 to 30.86% injury in S. aureus cells depending on pulse number. The inactivation results were also described by a kinetic model. |
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