Bremen 2017 – wissenschaftliches Programm
P 23.6: Poster
Mittwoch, 15. März 2017, 16:30–18:30, HS Foyer
Inactivation of Enterococcus mundtii by Indirect Plasma Treatment using Surface Micro-Discharge Electrode — •Sandra Moritz1, Janine Mandler1, Sylvia Binder2, Tetsuji Shimizu2, Meike Müller3, Markus H. Thoma1, and Julia Zimmermann2 — 1I. Physikalisches Institut, JLU Gießen, Germany — 2terraplasma GmbH, Garching, Germany — 3DLR Oberpfaffenhofen, Germany
Inactivation of microorganism by CAP is one major application in the field of plasma medicine. In this contribution, the inactivation of bacteria by an indirect plasma treatment using a Surface Micro-Discharge electrode is discussed. This could be used for e.g. disinfection of dental equipment. The experimental setup consists of a SMD electrode in a box, a chamber for samples, a humidifier (optionally) and a pump. A voltage of 6.4 kVpp at 10 kHz was applied to the electrode and the power consumption was around 3.5 W. By the pump a plasma gas flow is circulated from the electrode to the treatment chamber, through the humidifier and back to the pump. The plasma gas is confined in the system. Bacterial samples were prepared on stainless steel plates using Enterococcus mundtii. Each had approximately 106 bacteria. They were placed in the chamber and treated for 1-15 min.
Until 5 min in treatment time, there is a relatively fast inactivation effect with D-value (1 log reduction) of 1.5 min. After 5 min, the inactivation effect becomes slower. In 15 min, a larger than 5 log reduction of bacteria could be achieved. In the conference, time evolution of reactive species and mechanism of bactericidal effect will be discussed.