Plasma Process. Polym. 10/2011

Abstract

Cover: A lot of analytics and microbiological tests were done to get an insight into the complex chemistry of atmospheric pressure plasma in interaction with liquids and the resulting antimicrobial effects. Different species are detected and a variety of reaction channels is hypothesized which lead to bactericidal molecules. Further details can be found in the article by K. Oehmigen, J. Winter, Ch. Wilke, R. Brandenburg, M. Hähnel, K.‐D. Weltmann, Th. von Woedtke* .

How to produce an NOx- instead of Ox-based chemistry with a cold atmospheric plasma jet

“…This for the first time allows to control the plasma chemistry of a CAP jet and – e.g., by changing the feed gas admixture – to switch immediately from an O/O 3 ‐dominated plasma to an NO x ‐dominated regime. Furthermore, the method could be efficient in generating peroxinitrite (ONOO − ) in plasma‐treated liquids, a species which contributes to the antibacterial properties of plasma activated liquids and is often associated to its long‐term efficacy …”

Formation of ammonium in saline solution treated by nanosecond pulsed cold atmospheric microplasma: a route to fast inactivation of E. coli bacteria

“…2 Inactivation of bacteria by means of cold atmospheric plasma (CAP) treatment is therefore seen as a complementary and innovative way to decontaminate inorganic and biological surfaces or liquids as this technology avoids the drawbacks cited above. [6][7][8][9][10][11][12] NH 4 + and their derived nitrogenous products were never considered as species playing a major role in bacteria inactivation by CAP in solution at physiological pH, although NH 4 + was already detected in bacteria suspension treated by plasma in the work of Baik et al 9 Bactericidal effects of peroxynitrites were also observed by Machala et al, but only played a signicant role in acidic conditions. [6][7][8][9][10][11][12] NH 4 + and their derived nitrogenous products were never considered as species playing a major role in bacteria inactivation by CAP in solution at physiological pH, although NH 4 + was already detected in bacteria suspension treated by plasma in the work of Baik et al 9 Bactericidal effects of peroxynitrites were also observed by Machala et al, but only played a signicant role in acidic conditions.…”

UV–vis spectroscopy study of plasma-activated water: Dependence of the chemical composition on plasma exposure time and treatment distance

“…Plasma-activated liquid (PAL) including PAW is bacteriostatic against a number of microorganisms. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Its proposed high level of effectiveness in killing bacteria has earned it the nickname "water of death". 10) PAL has a good shelf-life with a reported retention of its antibacterial activity from days to weeks 7,15) to even years.…”