One-step synthesis of amino-functionalized up-converting NaYF4:Yb,Er nanoparticles for in vitro cell imaging
Autor: | Lidija Mančić, Aleksandra Djukić-Vuković, Mihailo D. Rabasović, Ljiljana Mojović, Ivana Dinić, Olivera Milošević, Antonio M.L.M. Costa, Aleksandar J. Krmpot, Bojan A. Marinkovic, Marko Nikolić |
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Rok vydání: | 2018 |
Předmět: |
upconversion
Photoluminescence Materials science General Chemical Engineering Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Chitosan Thermogravimetry chemistry.chemical_compound X-ray photoelectron spectroscopy chemistry Transmission electron microscopy cell imaging nanoparticles Fourier transform infrared spectroscopy Yb Er [NaYF4] 0210 nano-technology |
Zdroj: | RSC Advances |
ISSN: | 2046-2069 |
Popis: | The emerging up-conversion nanoparticles (UCNPs) offer a wide range of biotechnology applications, from biomarkers and deep tissue imaging, to single molecule tracking and drug delivery. Their successful conjugation to biocompatible agents is crucial for specific molecules recognition and usually requires multiple steps which may lead to low reproducibility. Here, we report a simple and rapid one-step procedure for in situ synthesis of biocompatible amino-functionalized NaYF4:Yb,Er UCNPs that could be used for NIR-driven fluorescence cell labeling. X-ray diffraction showed that UCNPs synthesized through chitosan-assisted solvothermal processing are monophasic and crystallize in a cubic alpha phase. Scanning and transmission electron microscopy revealed that the obtained crystals are spherical in shape with a mean diameter of 120 nm. Photoluminescence spectra indicated weaker green (H-2(11/2), S-4(3/2) - gt (4)/(15/2)) and stronger red emission (F-4(9/2) - gt (4)/(15/2)), as a result of enhanced non-radiative (4)/(11/2) - gt (4)/(13/2) Er3+ relaxation. The presence of chitosan groups at the surface of UCNPs was confirmed by Fourier transform infrared spectroscopy, thermogravimetry and X-ray photoelectron spectroscopy. This provides their enhanced internalization in cells, at low concentration of 10 mu g ml(-1), without suppression of cell viability after 24 h of exposure. Furthermore, upon 980 nm laser irradiation, the amino-functionalized NaYF4:Yb,Er UCNPs were successfully used in vitro for labeling of two human cell types, normal gingival and oral squamous cell carcinoma. Supplementary information: [https://technorep.tmf.bg.ac.rs/handle/123456789/3772] |
Databáze: | OpenAIRE |
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