Morphological and chemical changes of aerosolized E. coli treated with a dielectric barrier discharge.

Abstract:

:This study presents the morphological and chemical modification of the cell structure of aerosolized Escherichia coli treated with a dielectric barrier discharge (DBD). Exposure to DBD results in severe oxidation of the bacteria, leading to the formation of hydroxyl groups and carbonyl groups and a significant reduction in amine functionalities and phosphate groups. Near edge x-ray absorption fine structure (NEXAFS) measurements confirm the presence of additional oxide bonds upon DBD treatment, suggesting oxidation of the outer layer of the cell wall. Electron microscopy images show that the bacteria undergo physical distortion to varying degrees, resulting in deformation of the bacterial structure. The electromagnetic field around the DBD coil causes severe damage to the cell structure, possibly resulting in leakage of vital cellular materials. The oxidation and chemical modification of the bacterial components are evident from the Fourier transform infrared spectroscopy and NEXAFS results. The bacterial reculture experiments confirm inactivation of airborne E. coli upon treating with DBD.

journal_name

Biointerphases

journal_title

Biointerphases

authors

Romero-Mangado J,Nordlund D,Soberon F,Deane G,Maughan K,Sainio S,Singh G,Daniels S,Saunders IT,Loftus D,Meyyappan M,Koehne J,Gandhiraman RP

doi

10.1116/1.4941367

subject

Has Abstract

pub_date

2016-03-12 00:00:00

pages

011009

issue

2

eissn

1934-8630

issn

1559-4106

journal_volume

11

pub_type

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