title: In situ photoexcitation of silver-doped titania nanopowders for activity against bacteria and yeasts.
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.
authors: Institute of Biomedical Engineering and Instrumentation, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland. katarzyna.kowal@pwr.wroc.pl
authors: Katarzyna
authors: K
authors: Kowal
authors: Katarzyna
authors: K
authors: Wysocka-Król
authors: Marta
authors: M
authors: Kopaczyńska
authors: Ewa
authors: E
authors: Dworniczek
authors: Roman
authors: R
authors: Franiczek
authors: Magdalena
authors: M
authors: Wawrzyńska
authors: Melinda
authors: M
authors: Vargová
authors: Miroslav
authors: M
authors: Zahoran
authors: Erik
authors: E
authors: Rakovský
authors: Peter
authors: P
authors: Kuš
authors: Gustav
authors: G
authors: Plesch
authors: Andrej
authors: A
authors: Plecenik
authors: Fathima
authors: F
authors: Laffir
authors: Syed A M
authors: SA
authors: Tofail
authors: Halina
authors: H
authors: Podbielska
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology*; D002176:Candida albicans / Q000187:drug effects; D002177:Candidiasis / Q000188:drug therapy; D004926:Escherichia coli / Q000187:drug effects; D004927:Escherichia coli Infections / Q000188:drug therapy; D006801:Humans; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D055668:Photochemical Processes; D012834:Silver / Q000737:chemistry* / Q000494:pharmacology*; D013203:Staphylococcal Infections / Q000188:drug therapy; D014025:Titanium / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D000890:Anti-Infective Agents; C009495:titanium dioxide; D012834:Silver; D014025:Titanium