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Anti-microbial activities of aerosolized transition metal oxide nanoparticles.

Abstract：

:This study used the electrospray method to create airborne droplets of metal oxide nanoparticles (NPs) and examined their anti-microbial activities, employing Escherichia coli as a model microbial species. We tested the anti-microbial activities of six metal oxide NPs (NiO, ZnO, Fe(2)O(3), Co(3)O(4), CuO, and TiO(2)) in both an aqueous culture medium and an aerosol exposure mode (spraying the particles directly onto the cell surface). In the aqueous medium, the both NPs and stressed E. coli cells severely aggregated. Only NiO NPs (>20 mgL(-1)) showed significant growth inhibition of E. coli ( approximately 30%). In contrast to aqueous exposure, where the direct interactions between NPs and bacteria were limited, aerosol exposure of three metal oxide NPs to E. coli enhanced NP toxicity to cells and dramatically reduced cellular viability. Electrospraying NiO, CuO, or ZnO NPs (20 nm, 20 microg, in 10 min) reduced the total number of living E. coli by more than 88%, 77% and 71%, respectively (compared to the control experiments). However, TiO(2), Co(3)O(4), and Fe(2)O(3) NPs showed no significant antibacterial activities in either the aqueous exposure mode or the aerosol exposure mode. The above observations suggest the potential application of electrosprayed metal oxide NPs to disinfect airborne pathogens.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Wang Z,Lee YH,Wu B,Horst A,Kang Y,Tang YJ,Chen DR

doi

10.1016/j.chemosphere.2010.04.047

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

525-9

issue

5

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(10)00483-2

journal_volume

80

pub_type

杂志文章

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