| Autor: |
Neacsu A; Institute of Physical Chemistry 'Ilie Murgulescu', Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania., Chihaia V; Institute of Physical Chemistry 'Ilie Murgulescu', Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania., Bucuresteanu R; Microbiology Department, Faculty of Biology, University of Bucharest, Intr. Portocalelor 1-3, 060101 Bucharest, Romania., Ficai A; Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 060042 Bucharest, Romania., Trusca RD; 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., Surdu VA; National Research Centre for Micro and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania., Nicolaev A; National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania., Cojocaru B; Department of Inorganic Chemistry, Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Av., 030018 Bucharest, Romania., Ionita M; Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania., Calinescu I; Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania., Parvulescu V; Institute of Physical Chemistry 'Ilie Murgulescu', Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania., Ditu LM; Microbiology Department, Faculty of Biology, University of Bucharest, Intr. Portocalelor 1-3, 060101 Bucharest, Romania. |
| Abstrakt: |
Ca- and Cu-decorated TiO 2 microparticles are titanium dioxide nanoparticles that have been decorated with calcium and copper ions. TiO 2 , CaO, and CuO are low-cost, non-toxic, and non-hazardous materials. The aim of the present study was the physicochemical characterization of Ca- and Cu-decorated TiO 2 microparticles and the evaluation of their antimicrobial activity. Thus, Ca 2+ and Cu 2+ species were incorporated onto TiO 2 surfaces by a two-step wet method. The obtained TiO 2 -CaO-CuO composites were characterized by several experimental techniques. The electronic structure and charge properties of the composites were investigated by density functional theory calculations. Furthermore, the composites were successfully tested for inhibitory effects on Staphylococcus aureus , Pseudomonas aeruginosa , Escherichia coli , and Candida albicans standard strains. The zeta potential data indicate that the physiological condition of investigated microbial strains was strongly affected in presence of a dispersion of 10 μg/L of composites in a saline phosphate buffer also, the recorded SEM images show a damaged microbial cell surface in the presence of composites. |
