Open AccessSurface deposited one-dimensional copper-doped TiO2 nanomaterials for prevention of health care acquired infections
Author(s) -
Tilen Koklič,
Iztok Urbančič,
Irena Zdovc,
Majda Golob,
Polona Umek,
Zoran Arsov,
Goran Dražić,
Štefan Pintarič,
M. Dobeic,
Janez Štrancar
Publication year - 2018
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0201490
Subject(s) - staphylococcus aureus , copper , nanomaterials , methicillin resistant staphylococcus aureus , materials science , escherichia coli , doping , microbiology and biotechnology , nanotechnology , chemistry , bacteria , biology , optoelectronics , metallurgy , gene , biochemistry , genetics
Bacterial infections acquired in healthcare facilities including hospitals, the so called healthcare acquired or nosocomial infections, are still of great concern worldwide and represent a significant economical burden. One of the major causes of morbidity is infection with Methicillin Resistant Staphylococcus aureus (MRSA), which has been reported to survive on surfaces for several months. Bactericidal activity of copper-TiO 2 thin films, which release copper ions and are deposited on glass surfaces and heated to high temperatures, is well known even when illuminated with very weak UVA light of about 10 μW/cm 2 . Lately, there is an increased intrerest for one-dimensional TiO 2 nanomaterials, due to their unique properties, low cost, and high thermal and photochemical stability. Here we show that copper doped TiO 2 nanotubes produce about five times more ·OH radicals as compared to undoped TiO 2 nanotubes and that effective surface disinfection, determined by a modified ISO 22196:2011 test, can be achieved even at low intensity UVA light of 30 μW/cm 2 . The nanotubes can be deposited on a preformed surface at room temperature, resulting in a stable deposition resistant to multiple washings. Up to 10 3 microorganisms per cm 2 can be inactivated in 24 hours, including resistant strains such as Methicillin-resistant Staphylococcus aureus (MRSA) and Extended-spectrum beta-lactamase Escherichia coli ( E . coli ESBL). This disinfection method could provide a valuable alternative to the current surface disinfection methods.