Influence of water content on the inactivation of P. digitatum spores using an air-water plasma jet

文献类型： 外文期刊

第一作者： Hu, Youyi

作者： Hu, Youyi;Zhu, Weidong;Liu, Kun;Zheng, Zhenfeng;Hu, Huimin;Zhu, Weidong;Han, Leng

作者机构：

关键词： air-water plasma jet; water content; inactivation efficiency; P. digitatum spores; OH (A(2)Sigma(+)-X-2 Pi(i)); O (3p(5)P-3s(5)S)

期刊名称：PLASMA SCIENCE & TECHNOLOGY （ 影响因子：1.567； 五年影响因子：1.281 ）

ISSN： 1009-0630

年卷期： 2018 年 20 卷 4 期

页码：

收录情况： SCI

摘要： In order to investigate whether an air-water plasma jet is beneficial to improve the efficiency of inactivation, a series of experiments were done using a ring-needle plasma jet. The water content in the working gas (air) was accurately measured based on the Karl Fischer method. The effects of water on the production of OH (A(2)Sigma(+)-X-2 Pi(i)) and O (3p(5)P-3s(5)S) were also studied by optical emission spectroscopy. The results show that the water content is in the range of 2.53-9.58 mg l(-1), depending on the gas/water mixture ratio. The production of OH (A(2)Sigma(+)-X-2 Pi(i)) rises with the increase of water content, whereas the O (3p(5)P-3s(5)S) shows a declining tendency with higher water content. The sterilization experiments indicate that this air-water plasma jet inactivates the P. digitatum spores very effectively and its efficiency rises with the increase of the water content. It is possible that OH (A(2)Sigma(+)-X-2 Pi(i)) is a more effective species in inactivation than O (3p(5)P-3s(5)S) and the water content benefit the spore germination inhibition through rising the OH (A(2)Sigma(+)-X-2 Pi(i)) production. The maximum of the inactivation efficacy is up to 93% when the applied voltage is -6.75 kV and the water content is 9.58 mg l(-1).

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