Abstract
A sandwich-type electrochemical cytosensor is described for quantitative determination of CD44-overexpressing HeLa cells. Hyaluronic acid (HA) acts as a targeting molecule that was in-situ incorporated into the sensor based on the use of an indium tin oxide (ITO) electrode modified with multi-walled carbon nanotubes (MWCNTs). The 3D-MWCNT structure is shown to strongly improve the electronic properties and surface chemical reactivities. The HA-modified sensor exhibits a highly sensitive response to HeLa cells. A sandwiched hybridization protocol was then established using BIO [an N-butyl-4-(6′-aminohexyl)amino-1,8-naphthalimide probe modified with HA] as the tracing labels of the fluorescent probes for targeting CD44-positive tumor cells. The signal amplification was thereby maximized and measured by chronocoulometry. The binding of CD44-positive HeLa cells to the HA modified sensing layer causes a decrease in chronocoulometric response. The signal decreases linearly in the 2.1 × 102 to 2.1 × 107 HeLa cells·mL−1 concentration range with a detection limit of 70 cells·mL−1. Such a sandwich-type assay may be tailored as a sensitive candidate for detecting low levels of tumor cells.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (81472001, 21373138 and 31400851), the Minjiang Scholars Program of Fujian Province, the Tongjiang Scholars Program of Quanzhou City and the Fourth Health Education Joint Development Project of Fujian Province (WKJ-2016-2-36).
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Liu, M., Xu, Y., Huang, C. et al. Hyaluronic acid-grafted three-dimensional MWCNT array as biosensing interface for chronocoulometric detection and fluorometric imaging of CD44-overexpressing cancer cells. Microchim Acta 185, 338 (2018). https://doi.org/10.1007/s00604-018-2861-z
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DOI: https://doi.org/10.1007/s00604-018-2861-z