Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 170, Issue -, Pages 194-200Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2018.06.014
Keywords
Carbon dots; Bioimaging; CT; Targeting
Funding
- National Natural Science Foundation of China [21601142]
- Natural Science Foundation of Hubei Province [2017CFB689]
- Hong Kong Research Grants Council [HKBU 22304115-ECS]
- Hong Kong Baptist University [RC-IRMS/16/17/02CHEM, RC-ICRS/15-16/02E, FRG2/14-15/034]
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Iodine doped carbon quantum dots (I-CQDs) have been synthesized by a facile one-pot hydrothermal method using citric acid and iohexol as precursors. The morphology and chemical structures of I-CQDs are investigated by TEM, XRD, XPS, and FFIR spectroscopy. The as-prepared I-CQDs exhibit excitation-dependent PL behavior with the emission quantum yield of 18%. The presence of iodine ions in I-CQDs is confirmed by XPS spectrum, which endows the composite with CT imaging performance. Thus, they could be used as efficient probes for fluorescence/CT bimodal imaging. To realize a precise diagnosis of tumor lesions, the surface of I-CQDs is conjugated with a targeting molecular (cetuximab) to afford I-CQDs-C225. The MTT assay against three kinds of human cell lines verifies the low cytotoxicity of I-CQDs-C225. The targeting ability of I-CQDs-C225 are evaluated in vitro using HCC827 cells (lung cancer cell line, over-expression of EGFR), H23 (lung cancer cell line, low expression of EGFR) and HLF cells (lung normal cell line, low expression of EGFR) via a confocal laser scanning microscope. The results show that HCC827 cells exhibited strong fluorescence, indicating the cetuximab-conjugated I-CQDs could target specifically the cancer cells with over-expression of EGFR via EGFR mediated endocytosis.
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