Department of Animal Science and Biotechnology, Chungnam National University, Yuseong-Gu, Daejeon, Republic of Korea.
Food Microbiol. 2011 Feb;28(1):9-13. doi: 10.1016/j.fm.2010.07.022. Epub 2010 Aug 5.
Atmospheric pressure plasma (APP) is an emerging non-thermal pasteurization method for the enhancement of food safety. In this study, the effect of APP on the inactivation of pathogens inoculated onto bacon was observed. Sliced bacon was inoculated with Listeria monocytogenes (KCTC 3596), Escherichia coli (KCTC 1682), and Salmonella Typhimurium (KCTC 1925). The samples were treated with APP at 75, 100, and 125 W of input power for 60 and 90 s. Two gases, helium (10 lpm) or a mixture of helium and oxygen, (10 lpm and 10 sccm, respectively) were used for the plasma generation. Plasma with helium could only reduce the number of inoculated pathogens by about 1-2 Log cycles. On the other hand, the helium/oxygen gas mixture was able to achieve microbial reduction of about 2-3 Log cycles. The number of total aerobic bacteria showed 1.89 and 4.58 decimal reductions after plasma treatment with helium and the helium/oxygen mixture, respectively. Microscopic observation of the bacon after plasma treatment did not find any significant changes, except that the L∗-value of the bacon surface was increased. These results clearly indicate that APP treatment is effective for the inactivation of the three pathogens used in this study, although further investigation is needed for elucidating quality changes after treatment.
大气压等离子体（APP）是一种新兴的非热巴氏杀菌方法，可用于提高食品安全。在本研究中，观察了 APP 对接种在培根上的病原体失活的影响。将切片培根接种李斯特菌（KCTC 3596）、大肠杆菌（KCTC 1682）和鼠伤寒沙门氏菌（KCTC 1925）。将样品用输入功率为 75、100 和 125 W 的 APP 处理 60 和 90 s。使用两种气体，氦气（10 lpm）或氦气和氧气的混合物（分别为 10 lpm 和 10 sccm）进行等离子体生成。氦气等离子体只能将接种的病原体数量减少约 1-2 Log 循环。另一方面，氦/氧气混合气体能够实现约 2-3 Log 循环的微生物减少。用氦气和氦/氧气混合物进行等离子体处理后，总需氧细菌数量分别减少了 1.89 和 4.58 个十进制数。对等离子体处理后的培根进行显微镜观察，除了培根表面的 L∗值增加外，没有发现任何明显变化。这些结果清楚地表明，尽管需要进一步研究以阐明处理后的质量变化，但 APP 处理对本研究中使用的三种病原体的失活是有效的。
