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Open AccessArticle

A Novel Biocompatible Titanium–Gadolinium Quantum Dot as a Bacterial Detecting Agent with High Antibacterial Activity

1
Department of Chemistry and Biochemistry, Faculty of AgriSciences, Mendel University in Brno, Zemedelska 1/1665, CZ-61300 Brno, Czech Republic
2
Central European Institute of Technology (CEITEC), Brno University of Technology, Purkynova 123, CZ-62100 Brno-Královo Pole, Czech Republic
3
Department of Inorganic Chemistry, Faculty of Science, Palacky University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2020, 10(4), 778; https://doi.org/10.3390/nano10040778
Received: 18 March 2020 / Revised: 14 April 2020 / Accepted: 16 April 2020 / Published: 17 April 2020
(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)
In this study, the titanium–gadolinium quantum dots (TGQDs) were novel, first of its type to be synthesized, and fully characterized to date. Multiple physical characterization includes scanning electron microscopy (SEM), scanning electrochemical microscope (SCEM), x-ray fluorescence, spectrophotometry, and dynamic light scattering were carried out. The obtained results confirmed appropriate size and shape distributions in addition to processing optical features with high quantum yield. The synthesized TGQD was used as a fluorescent dye for bacterial detection and imaging by fluorescent microscopy and spectrophotometry, where TGQD stained only bacterial cells, but not human cells. The significant antibacterial activities of the TGQDs were found against a highly pathogenic bacterium (Staphylococcus aureus) and its antibiotic resistant strains (vancomycin and methicillin resistant Staphylococcus aureus) using growth curve analysis and determination of minimum inhibitory concentration (MIC) analysis. Live/dead cell imaging assay using phase-contrast microscope was performed for further confirmation of the antibacterial activity. Cell wall disruption and release of cell content was observed to be the prime mode of action with the reduction of cellular oxygen demand (OD). View Full-Text
Keywords: bacterial resistance; titanium–gadolinium quantum dots; bacterial detection; antibacterial activity; SECM bacterial resistance; titanium–gadolinium quantum dots; bacterial detection; antibacterial activity; SECM
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Sur, V.P.; Mazumdar, A.; Ashrafi, A.; Mukherjee, A.; Milosavljevic, V.; Michalkova, H.; Kopel, P.; Richtera, L.; Moulick, A. A Novel Biocompatible Titanium–Gadolinium Quantum Dot as a Bacterial Detecting Agent with High Antibacterial Activity. Nanomaterials 2020, 10, 778.

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