Purevdorj D, Igura N, Ariyada O, Hayakawa I
Faculty of Agriculture, Laboratory of Food Process Engineering, Kyushu University, Fukuoka, Japan.
Lett Appl Microbiol. 2003;37(1):31-4. doi: 10.1046/j.1472-765x.2003.01341.x.
To investigate the effect of gas composition on the sensitivity of Bacillus pumilus spores to gas plasmas.
Inert gas plasmas, oxygen-based plasmas and various moisturized air plasmas were used to inactivate B. pumilus spores in low gas pressure of 50 Pa. Although the treatment temperature did not exceed 55 degrees C when exciting these plasmas, spore survival varied widely depending on the composition of the gas feed. Higher spore mortality was acquired by inert gases of low molecular weight except for helium. The highest spore mortality (4.54log reduction) was obtained when air with a 0.05 molar fraction of water vapour was used as the plasma carrier gas.
Water molecules in the plasma carrier gas play a significant role in inactivation of B. pumilus spores.
This strong inactivation may occur through hydroxyl free radicals generated from the moisturized air plasma.
研究气体成分对短小芽孢杆菌孢子对气体等离子体敏感性的影响。
在50 Pa的低气压下，使用惰性气体等离子体、基于氧气的等离子体和各种加湿空气等离子体来灭活短小芽孢杆菌孢子。尽管在激发这些等离子体时处理温度不超过55℃，但孢子存活率因进气成分的不同而有很大差异。除氦气外，低分子量惰性气体可导致较高的孢子死亡率。当使用水蒸气摩尔分数为0.05的空气作为等离子体载气时，孢子死亡率最高（降低4.54个对数）。
等离子体载气中的水分子在短小芽孢杆菌孢子的灭活中起重要作用。
这种强烈的灭活作用可能是通过加湿空气等离子体产生的羟基自由基实现的。
