In:
Journal of Physics D: Applied Physics, IOP Publishing, Vol. 55, No. 42 ( 2022-10-20), p. 425203-
Abstract:
In this work, surface decontamination of bacteria by argon atmospheric-pressure plasma jet was systematically studied. The chemical modifications and etching characteristics of Gram-positive and Gram-negative bacteria under direct plasma jet exposure were inspected by in-situ Fourier transform infrared spectroscopy. Etching rather than chemical modifications dominates the infrared spectral variations. The etching rate of bacteria is comparable to the cell wall constituents. By using the green fluorescence protein-expressing Escherichia coli , it is found that cellular envelope destruction by plasma etching is the main cause of bacterial inactivation. The tailing phenomenon of the survival curve is more pronounced when the initial bacterial density is higher than ∼1 × 10 7 CFU cm −2 , indicating the limited penetration depth of reactive species into bacterial deposits. Finally, three dominant biological processes key to surface decontamination were put forward according to our results.
Type of Medium:
Online Resource
ISSN:
0022-3727
,
1361-6463
DOI:
10.1088/1361-6463/ac8432
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2022
detail.hit.zdb_id:
209221-9
detail.hit.zdb_id:
1472948-9
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