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2 2014

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Sterilization of bacteria suspensions and identification of radicals deposited during plasma treatment

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Puač N. , Miletić M. , Mojović M. , Popović-Bijelić A. , Vuković D. , Miličić B. , Maletić D. , Lazović S. , Malović G. , Petrović Z. L.

Open Chemistry

2015

tom 13

nr 1

In this paper we will present results for plasma sterilization of planktonic samples of two reference strains of bacteria, Pseudomonas aeruginosa ATCC 27853 and Enterococcus faecalis ATCC 29212. We have used a plasma needle as a source of non-equilibrium atmospheric plasma in all treatments. This device is already well characterized by OES, derivative probes and mass spectrometry. It was shown that power delivered to the plasma is bellow 2 W and that it produces the main radical oxygen and nitrogen species believed to be responsible for the sterilization process. Here we will only present results obtained by electron paramagnetic resonance which was used to detect the OH, H and NO species. Treatment time and power delivered to the plasma were found to have the strongest influence on sterilization. In all cases we have observed a reduction of several orders of magnitude in the concentration of bacteria and for the longest treatment time complete eradication. A more efficient sterilization was achieved in the case of gram negative bacteria.

Inhibition of methicillin resistant Staphylococcus aureus by a plasma needle

100%

Miletić M. , Vuković D. , Živanović I. , Dakić I. , Soldatović I. , Maletić D. , Lazović S. , Malović G. , Petrović Z. , Puač N.

Open Physics

2014

tom 12

nr 3

160-167

In numerous recent papers plasma chemistry of non equilibrium plasma sources operating at atmospheric pressure has been linked to plasma medical effects including sterilization. In this paper we present a study of the effectiveness of an atmospheric pressure plasma source, known as plasma needle, in inhibition of the growth of biofilm produced by methicillin resistant Staphylococcus aureus (MRSA). Even at the lowest powers the biofilms formed by inoculi of MRSA of 104 and 105 CFU have been strongly affected by plasma and growth in biofilms was inhibited. The eradication of the already formed biofilm was not achieved and it is required to go to more effective sources.