Abstract |
A fluorescent aptasensor based on porphyrin-based covalent organic framework (p-COF) and carbon dots (CDs) was constructed for detecting vascular endothelial growth factor 165 (VEGF165) and for imaging of the breast cancer cell line Michigan cancer foundation-7 (MCF-7). CDs synthesized with strong photoluminescence at λ∼380 nm were used as donors to label the VEGF165-targeted aptamers (AptVEGF/CDs). Additionally, the p-COF nanostructure comprised rich functional groups of CN on the surface and π-stacking planar nanostructure, resulting in the CDs adsorption via weakly π-π stacking, hydrogen bond and the Van der Waals force. Thereby, the fluorescence resonance energy transfer (FRET) occurred due to the close distance between the p-COF network and CDs, leading to the quenching of the fluorescence feature of CDs and p-COF. In the presence of VEGF165, the G-quadruplex was formed via the specific binding between VEGF165 and aptamer. It impelled that the release of partial VEGF165-AptVEGF/CDs complex, affording the fluorescence recovery of the sensing system to some extent. Consequently, the proposed AptVEGF/CDs/p-COF fluorescence biosensor offered excellent analytical performances for the VEGF165 detection, displaying a detection limit of 20.9 fg mL-1 within a wide linear range of the VEGF165 concentration of 1.0 pg mL-1-100 ng mL-1. The developed fluorescence biosensor was also used to determine VEGF165-overexpressed in MCF-7 cancer cells. Thereby, the present work can greatly widen the application of COFs in the development of aptasensors and cancer diagnosis.
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Authors | Jing Cui, Lun Kan, Zhenzhen Li, Longyu Yang, Minghua Wang, Linghao He, Yafei Lou, Yulin Xue, Zhihong Zhang |
Journal | Talanta
(Talanta)
Vol. 228
Pg. 122060
(Jun 01 2021)
ISSN: 1873-3573 [Electronic] Netherlands |
PMID | 33773722
(Publication Type: Journal Article)
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Copyright | Copyright © 2021 Elsevier B.V. All rights reserved. |
Chemical References |
- Aptamers, Nucleotide
- Metal-Organic Frameworks
- Porphyrins
- Vascular Endothelial Growth Factor A
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Topics |
- Aptamers, Nucleotide
- Biosensing Techniques
- Fluorescence Resonance Energy Transfer
- Humans
- Limit of Detection
- Metal-Organic Frameworks
- Porphyrins
- Quantum Dots
- Vascular Endothelial Growth Factor A
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