Abstract
In this work, we developed a photoelectrochemical assay for circulating tumor cells (CTCs) detection based on hexagonal carbon-nitrogen tubes (HCNT) as visible light-sensitive materials. The MCF-7 cell was selected as the model CTC and was captured through specific recognition between epithelial cell adhesion molecules (EpCAM) on the cell surface and anti-EpCAM antibodies. Anti-EpCAM antibody-modified magnetic nanoparticles were used to enrich and separate MCF-7 cells from samples. The detection signal was amplified by Ag2S nanocrystals, which can compete with HCNTs for absorbing visible light, leading to a decrease of photocurrent intensity. The linear range of the assay for MCF-7 cells is from 10 to 5000 cells mL−1, with a detection limit of 3 cells mL−1 (S/D = 3). The assay has good selectivity for MCF-7 detection over HeLa cells. The assay was successfully applied for the detection of MCF-7 in human whole blood, which indicates the potential for clinical application.
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Acknowledgments
The authors are thankful for the support of this work by the Hunan Provincial Science and Technology Plan Project, China (No. 2019TP1001) and Innovation-Driven Project of Central South University (2020CX002).
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All experiments were in accordance with the guidelines of the National Institute of Health, China, and approved by the Institutional Ethical Committee (IEC) of the Second Xiangya Hospital affiliated with Central South University.
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Wang, Z., Luo, J., Yang, M. et al. Photoelectrochemical assay for the detection of circulating tumor cells based on aptamer-Ag2S nanocrystals for signal amplification. Anal Bioanal Chem 413, 5259–5266 (2021). https://doi.org/10.1007/s00216-021-03502-5
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DOI: https://doi.org/10.1007/s00216-021-03502-5