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Article

Antimicrobial Properties of TiO2 Microparticles Coated with Ca- and Cu-Based Composite Layers

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Microbiology Department, Faculty of Biology, University of Bucharest, Intr. Portocalelor 1-3, 060101 Bucharest, Romania
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Research Institute of the University of Bucharest, Sos. Panduri 90, 050663 Bucharest, Romania
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Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Gh Polizu Street, 011061 Bucharest, Romania
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Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
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Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Gh Polizu Street, 011061 Bucharest, Romania
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National Centre for Micro and Nanomaterials and National Centre for Food Safety, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, Spl. Indendentei 313, 060042 Bucharest, Romania
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Academy of Romanian Scientists, 3 Ilfov Street, 050045 Bucharest, Romania
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National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
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Faculty of Building Services Engineering, Technical University of Civil Engineering Bucharest, 020396 Bucharest, Romania
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Authors to whom correspondence should be addressed.
Academic Editor: Ana María Díez-Pascual
Int. J. Mol. Sci. 2022, 23(13), 6888; https://doi.org/10.3390/ijms23136888
Received: 28 May 2022 / Revised: 17 June 2022 / Accepted: 18 June 2022 / Published: 21 June 2022
The ability of TiO2 to generate reactive oxygen species under UV radiation makes it an efficient candidate in antimicrobial studies. In this context, the preparation of TiO2 microparticles coated with Ca- and Cu-based composite layers over which Cu(II), Cu(I), and Cu(0) species were identified is presented here. The obtained materials were characterized by a wide range of analytical methods, such as X-ray diffraction, electron microscopy (TEM, SEM), X-ray photoelectron (XPS), and UV-VIS spectroscopy. The antimicrobial efficiency was evaluated using qualitative and quantitative standard methods and standard clinical microbial strains. A significant aspect of this composite is that the antimicrobial properties were evidenced both in the presence and absence of the light, as result of competition between photo and electrical effects. However, the antibacterial effect was similar in darkness and light for all samples. Because no photocatalytic properties were found in the absence of copper, the results sustain the antibacterial effect of the electric field (generated by the electrostatic potential of the composite layer) both under the dark and in light conditions. In this way, the composite layers supported on the TiO2 microparticles’ surface can offer continuous antibacterial protection and do not require the presence of a permanent light source for activation. However, the antimicrobial effect in the dark is more significant and is considered to be the result of the electric field effect generated on the composite layer. View Full-Text
Keywords: antimicrobial coating; Ca-Cu composite layer; TiO2 microparticles; cell wall electric charge antimicrobial coating; Ca-Cu composite layer; TiO2 microparticles; cell wall electric charge
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MDPI and ACS Style

Bucuresteanu, R.; Ionita, M.; Chihaia, V.; Ficai, A.; Trusca, R.-D.; Ilie, C.-I.; Kuncser, A.; Holban, A.-M.; Mihaescu, G.; Petcu, G.; Nicolaev, A.; Costescu, R.M.; Husch, M.; Parvulescu, V.; Ditu, L.-M. Antimicrobial Properties of TiO2 Microparticles Coated with Ca- and Cu-Based Composite Layers. Int. J. Mol. Sci. 2022, 23, 6888. https://doi.org/10.3390/ijms23136888

AMA Style

Bucuresteanu R, Ionita M, Chihaia V, Ficai A, Trusca R-D, Ilie C-I, Kuncser A, Holban A-M, Mihaescu G, Petcu G, Nicolaev A, Costescu RM, Husch M, Parvulescu V, Ditu L-M. Antimicrobial Properties of TiO2 Microparticles Coated with Ca- and Cu-Based Composite Layers. International Journal of Molecular Sciences. 2022; 23(13):6888. https://doi.org/10.3390/ijms23136888

Chicago/Turabian Style

Bucuresteanu, Razvan, Monica Ionita, Viorel Chihaia, Anton Ficai, Roxana-Doina Trusca, Cornelia-Ioana Ilie, Andrei Kuncser, Alina-Maria Holban, Grigore Mihaescu, Gabriela Petcu, Adela Nicolaev, Ruxandra M. Costescu, Mihai Husch, Viorica Parvulescu, and Lia-Mara Ditu. 2022. "Antimicrobial Properties of TiO2 Microparticles Coated with Ca- and Cu-Based Composite Layers" International Journal of Molecular Sciences 23, no. 13: 6888. https://doi.org/10.3390/ijms23136888

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