Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/43231
標題: The disruption of bacterial membrane integrity through ROS generation induced by nanohybrids of silver and clay
作者: Su, H.L.
蘇鴻麟
Chou, C.C.
Hung, D.J.
Lin, S.H.
Pao, I.C.
Lin, J.H.
Huang, F.L.
Dong, R.X.
Lin, J.J.
林江珍
關鍵字: Silver nanoparticles
Reactive oxygen species
Clay
escherichia-coli
antibacterial activity
au nanoparticles
free-radicals
size
growth
ag
protection
laponite
hydrogen
期刊/報告no:: Biomaterials, Volume 30, Issue 30, Page(s) 5979-5987.
摘要: Nanohybrids, synthesized via silver nitrate reduction in the presence of silicate clay, exhibit a high potency against bacterial growth. The plate-like clay, due to its anionic surface charges and a large surface area, serves as the support for the formation of silver nanoparticles (AgNPs) similar to 30 nm in diameter. The nano-hybrid consisting of Ag/silicate at a 7/93 weight ratio inhibited the growth of dermal pathogens including Staphylococcus aureus (S. aureus), Pseudomonas aeruginosa and Streptococcus pyrogens, as well as the methicillin- and oxacillin-resistant S. aureus (MRSA and ORSA). Scanning electron microscope revealed that these nanohybrids were adherent on the surface of individual bacteria. The thin silicate plates provide a surface for immobilizing AgNPs in one highly concentrated area but prevent them from entering the cell membrane. Subsequent cytotoxicity studies indicated that surface contact with the reduced AgNPs on clay is sufficient to initiate cell death. This toxicity is related to a loss in membrane integrity due to reactive oxygen species (ROS) generation. The hybridization of AgNPs on clay surface is viable for generating a new class of nanohybrids exhibiting mild cytotoxicity but high efficacy for battling drug-resistant bacteria. (C) 2009 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/11455/43231
ISSN: 0142-9612
文章連結: http://dx.doi.org/10.1016/j.biomaterials.2009.07.030
Appears in Collections:材料科學與工程學系

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