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In situ photoexcitation of silver-doped titania nanopowders for activity against bacteria and yeasts.
- Source :
-
Journal of colloid and interface science [J Colloid Interface Sci] 2011 Oct 01; Vol. 362 (1), pp. 50-7. Date of Electronic Publication: 2011 Jun 21. - Publication Year :
- 2011
-
Abstract
- Photocatalytic and in situ microbial activity of the amorphous and annealed states of Ag-doped and un-doped titania were examined. Studies on their structure, morphology, composition, and the photo-absorption characteristics of these materials were performed. These results were correlated with the photocatalytic and microbial activity against methicillin resistant Staphylococcus aureus K324 (MRSA), methicillin susceptible S. aureus ATCC 25923 (MSSA), Escherichia coli PA 170, and yeasts Candida albicans ATCC 90028. The annealed powders containing anatase form of titania exhibited relatively higher photocatalytic activity,corresponding to activity against MRSA,when exposed to UV-A radiation. In comparison, amorphous powders exhibited low photoactivity and showed poor antibacterial performance against MRSA under UV-A exposure. Doping of amorphous titania with Ag resulted in an anti-MRSA effect without exposure to UV radiation. In the Ag-doped crystalline anatase samples, the size of Ag primary nanocrystallites increased, which led to the decrease in the surface concentration of Ag and detriment anti-MRSA activity.<br /> (Copyright © 2011 Elsevier Inc. All rights reserved.)
- Subjects :
- Candida albicans drug effects
Candidiasis drug therapy
Escherichia coli drug effects
Escherichia coli Infections drug therapy
Humans
Methicillin-Resistant Staphylococcus aureus drug effects
Microbial Sensitivity Tests
Nanostructures ultrastructure
Photochemical Processes
Staphylococcal Infections drug therapy
Anti-Infective Agents chemistry
Anti-Infective Agents pharmacology
Nanostructures chemistry
Silver chemistry
Silver pharmacology
Titanium chemistry
Titanium pharmacology
Subjects
Details
- Language :
- English
- ISSN :
- 1095-7103
- Volume :
- 362
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of colloid and interface science
- Publication Type :
- Academic Journal
- Accession number :
- 21741659
- Full Text :
- https://doi.org/10.1016/j.jcis.2011.06.035