Atmospheric cold plasma inactivation of Escherichia coli in liquid media inside a sealed package
D Ziuzina1, S Patil, P J Cullen
1School of Food Science and Environmental Health, Dublin Institute of Technology, Dublin, Ireland.
Aims:
The main objective of this study was to determine the inactivation efficacy of dielectric barrier discharge atmospheric cold plasma (DBD-ACP) generated inside a sealed package for Escherichia coli ATCC 25922.
Methods And Results:
A plasma discharge was generated between two circular aluminium electrodes at 40 kV. E. coli suspensions (10(7) CFU ml(-1)) in either maximum recovery diluent (MRD) or phosphate buffered saline (PBS) were treated in a 96-well microtitre plate inside a sealed package. The effects of treatment time, post-treatment storage time, either direct or indirect samples exposure to the plasma discharge and suspension media were studied. Regardless of the media tested, 20 s of direct and 45 s of indirect plasma treatment resulted in complete bacterial inactivation (7 log CFU ml(-1)). At the lower plasma treatment times (10-30 s) investigated, the effects of suspension media and mode of exposure on the inactivation efficacy were evident. The inactivation efficacy was also influenced by the post-treatment storage time.
Conclusions:
It was demonstrated that the novel DBD-ACP can inactivate high concentrations of E. coli suspended in liquids within sealed packages in seconds.
Significance And Impact Of The Study:
A key advantage of this in-package nonthermal novel disinfection approach is the elimination of post-processing contamination.
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