期刊
BIOMATERIALS
卷 31, 期 29, 页码 7526-7533出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2010.06.032
关键词
Antimicrobial; Titanium oxide; Cytotoxicity; SEM; TEM; Nanoindentation
资金
- Center of Advanced Materials for the Purification of Water with Systems
- National Science Foundation [CTS-0120978]
- U.S. Department of Energy [DEFG02-91-ER45439]
The cellular responses of Escherichia coli to visible light photocatalysis were characterized by chemical, optical, electron-beam, and surface-force techniques, to elucidate the mechanisms of photocatalytic inactivation of E. coli on PdO/TiON fiber. The characterization techniques included chemical assays, fluorescence microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). Fluorescence microscopy using the Live/Dead BacLight (TM) kit indicates that the photocatalytic treatment resulted in severe membrane damage to the E. coli cells. SEM, AFM and TEM revealed drastic defects in the morphology and internal sub-structure of the bacterial cells after the treatments. Combining data from our previous reports on the antimicrobial properties of visible-light-activated PdO/TiON photocatalyst, the present results point to oxidative attack from the exterior to the interior of the bacteria by hydroxyl radicals as the primary mechanism of photocatalytic inactivation. (C) 2010 Elsevier Ltd. All rights reserved.
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