Abstract
As a dimeric protein, thyroglobulin (Tg) is an important biomarker for different thyroid cancer (DTC), so designing effective method to detect Tg is of great significance. In this work, by preparing β-cyclodextrin (CD) functionalized carbon nanotubes (CNTs) nanohybrid (CD-CNTs) as carrier to immobilize primary antibody (Ab1) of Tg, assembling sulfydryl ferrocene (Fc) and secondary antibody (Ab2) on the surface of nanogold (Au) as signaling amplifier (Ab2-Au-Fc), a simple and sensitive sandwich-type electrochemical immunoassay (STEM) of Tg was designed herein for the first time. In brief, CNTs show large surface area and conductivity, while CD offers superior host–guest recognition capability that can bound with Ab1; meanwhile, Fc probe can offer stable electrochemical signal that is proportionable to the concentration of Tg. Under the optimum conditions, the proposed STEM platform shows excellent sensing results for Tg detection: a considerable low analytical detection (0.5 ng mL−1) and wide linearity (2 to 200 ng mL−1), suggesting the designed STEM platform offers potential real applications for detect Tg.
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Acknowledgements
The work was financially supported by 2022 project support fund Department of Finance of Fujian Provincial (MCZ [2021] No. 848).
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Zhang, H., Lin, Z., Li, Y. et al. Highly sensitive detection of thyroglobulin based on sandwich-type electrochemical immunoassay. ANAL. SCI. 39, 969–975 (2023). https://doi.org/10.1007/s44211-023-00305-9
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DOI: https://doi.org/10.1007/s44211-023-00305-9