Inactivation Effects of Non-Thermal Atmospheric-Pressure Helium Plasma Jet on Staphylococcus aureus Biofilms

作者:Xu Zimu; Shen Jie; Zhang Zelong; Ma Jie; Ma Ronghua; Zhao Ying; Sun Qiang; Qian Shulou; Zhang Hao; Ding Lili*; Cheng Cheng; Chu Paul K; Xia Weidong
来源:Plasma Processes and Polymers, 2015, 12(8): 827-835.
DOI:10.1002/ppap.201500006

摘要

The antimicrobial effects and mechanism of helium atmospheric-pressure plasma jet (APPJ) treatment on Staphylococcus aureus biofilms are evaluated in vitro. The S. aureus biofilms are more resistant to the plasma treatment than adherent bacteria. The APPJ-treated S. aureus biofilms disclose a depth/layer-related intra-bacterial ROS accumulation effect. Plasma exposure may induce bacterial oxidative stress and trigger the production of intracellular reactive oxygen species (ROS) in the biofilms, which possibly contributes to bacteria death in addition to direct etching from the exterior of bacteria. The findings provide insights into the mechanism of biofilm inactivation by plasma reactive species and plasma-induced intracellular ROS.

  • 单位
    中国科学院; 香港城市大学; 中国科学院合肥物质科学研究院