期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 372, 期 -, 页码 99-107出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2018.12.011
关键词
Phyllanthus acidus; Nitrogen-doped carbon quantum dots; Tunable fluorescence; Caenorhabditis elegans; Biocompatibility; Live-cell imaging
资金
- Nano Material Technology Development Program of the Korean National Research Foundation (NRF) - Korean Ministry of Education, Science, and Technology [2012M3A7B4049675]
- Priority Research Centers Program [2014R1A6A1031189]
- National Research Foundation (NRF) of Korea - Ministry of Science, Information and Communications Technology (MSIT) of Korea government [2017R1C1B5076345]
In this work, nitrogen-doped carbon quantum dots (N-CQDs) have been synthesized successfully by a simple hydrothermal method and demonstrated its application for multicolor imaging in Caenorhabditis elegans (C. elegans) as an in vivo model. The synthesized N-CQDs were characterized by various physicochemical techniques such as XRD, Raman spectroscopy, ATR-FTIR spectroscopy, XPS, HRTEM, UV-vis spectroscopy, and fluorescence spectroscopy. The synthesized N-CQDs exhibited a strong fluorescence due to the uniform size distribution with nitrogen-containing and oxygen-containing functional groups onto the surface of N-CQDs which induce the excellent dispersibility in aqueous media. The N-CQDs has an excitation-dependent fluorescence behavior and the strongest fluorescence appeared at 411 nm (emission peak position) under the excitation of 340 nm. Also, the N-CQDs displayed a high quantum yield (QY) of 12.5. The fluorescence behaviour of the aqueous N-CQDs suspension retains for a long time up to 1 year. The prolonging fluorescent N-CQDs was utilized as a staining agent for bioimaging and toxicity of N-CQDs on C. elegans that was conducted by killing assay. In-vivo studies suggested that the N-CQDs displayed excellent biocompatibility and successfully used for high-contrast imaging of N-CQDs in living and dead C. elegans. Based on the strongest fluorescence along with excellent aqueous dispersibility and biocompatibility, the green synthesized N-CQDs would be an ideal candidate for many biological applications.
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