Disinfection of various bacterial pathogens using novel silver nanoparticle-decorated magnetic hybrid colloids

Title
Disinfection of various bacterial pathogens using novel silver nanoparticle-decorated magnetic hybrid colloids
Authors
우경자박성준박혜헌고영선이수진이태선고광표
Keywords
silver nanoparticle; anaerobic; Magnetic hybrid colloid; antibacterial agents; Disinfection; aerobic
Issue Date
2017-12
Publisher
The Science of the total environment
Citation
VOL 609-296
Abstract
Silver nanoparticles (AgNPs) have long been considered a powerful disinfectant for controlling pathogenic microorganisms. However, AgNPs might have adverse effects on both human health and our ecosystems due to their potential cytotoxicity and the difficulty in recovering them after their release into the environment. In this study, we characterized the antimicrobial efficacy caused by a novel micrometer-sized magnetic hybrid colloid (MHC) containing 7, 15, or 30 nm sized monodispersed AgNPs (AgNP-MHCs), which can be re-collected from the environment using simple procedures, such as a magnet or centrifugation. We evaluated the antibacterial capabilities of AgNP-MHCs against target bacteria (Legionella pneumophila, Bacillus subtilis, Escherichia coli, and Clostridium perfringens) and compared them with the inactivation efficacy of AgNPs ~ 30 nm in diameter (nAg30s). Among the different AgNP-MHCs composites evaluated, Ag30-MHCs had the greatest antibacterial effect. After 1 h of exposure, more than a 4-log10 reduction of L. pneumophila and 6-log10 reduction of B. subtilis was achieved by 4.6 × 109 particles/mL of Ag30-MHCs and Ag30-MHC-Ls. In addition, Ag30-MHC-Ls maintained their strong antibacterial capabilities under anaerobic conditions. Our results indicate that AgNP-MHCs can be considered excellent tools for controlling waterborne bacterial pathogens, with a minimal risk of release into the environment.
URI
http://pubs.kist.re.kr/handle/201004/66188
ISSN
0048-9697
Appears in Collections:
KIST Publication > Article
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