München 2009 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 4: Biophysical effects of very slow and of fast ions
ST 4.1: Vortrag
Dienstag, 10. März 2009, 17:45–18:00, A021
Deactivation of bacteria using a low temperature miniature pulsed atmospheric plasma jet — •Antje Lehmann1, Tina Hofmann1, Kathrin Schmidt3, Daniela Wind2, Andreas Schubert3, Stefan Rupf2, and Axel Schindler1 — 1Leibniz-Institut für Oberflächenmodifizierung, Leipzig — 2Universitätsklinikum des Saarlandes, Klinik für Zahnerhaltung, Parodontologie und Präventive Zahnheilkunde, Homburg/Saar — 3Fraunhofer Institut Zelltherapie und Immunologie, Leipzig
A cold miniature atmospheric plasma jet based on pulsed 2.45 GHz microwave excitation has been developed. Investigations are performed for developments of potential medical and dentistry applications. The present work focuses on the deactivation of biofilms built up of different bacteria.
Investigations have been performed by localized treatment of various types of bacterial films on Agar in Petri dishes and tooth samples, which have been covered with various types of bacteria. The local plasma jet treatment was reproducibly performed with the help of a computer controlled x,y,z-scanning stage. The plasma jet mean power has been optimized to limit the film temperature in the jet contact area close to human body temperature, measured in-situ by pyrometry. Variations in the processing gas mixtures consisting of helium, oxygen and nitrogen have been performed to optimize the production of reactive species in the jet measured by spatial resolved quadrupole mass spectrometry.