Applying on Bacillus cereus of Low-Pressure and Low-Temperature Plasma Jet in a Postdischarge Chamber

A low-temperature flowing postdischarge plasma reactor is first presented. The reactor is a postdischarge chamber coupled to a plasma jet system. The low-pressure flowing postdischarge (jet) in the postdischarge chamber can be generated using direct current (dc) or alternative current (ac) power supplies. A low-pressure plasma jet of Neon using a 25-kHz 25-kV ac voltage and low-pressure plasma jet of ambient air using a 5-kV dc voltage produced in the postdischarge chamber are given. By using sample holders in the postdischarge chamber, early or late flowing postdischarge (jet) can be exposed to the sample surface. In this paper, the low-temperature and low-pressure dc air plasma jet generated using the plasma jet system coupled to a postdischarge chamber is first exposed on to Bacillus cereus, as a model bacterium. The inactivation effect on Bacillus cereus of the low-temperature and low-pressure dc air plasma jet at several exposure times was observed. With treatment of 30 min of exposure times, a value below the decimal value of the used bacterium was obtained of 15 min of exposure times.