Abstract
A novel heterogeneous architecture has been constructed integrating two-dimensional (2D) bimetallic CoCu–zeolite imidazole framework (CoCu-ZIF) and zero-dimensional (0D) Ti3C2Tx MXene-derived carbon dots (CDs) (represented by CoCu-ZIF@CDs). The prepared CoCu-ZIF@CDs were further explored as sensitive layer for anchoring B16-F10 cell–targeted aptamer strands and detecting B16-F10 cells from the biological environment. Basic characterization showed that CDs were homogeneously embedded within CoCu-ZIF NSs owing to their π-π stacking interaction, leading to outstanding fluorescence performance of the 0D/2D CoCu-ZIF@CD nanohybrid. As such, the CoCu-ZIF@CD-based cytosensor was applied to detect living B16-F10 cells through electrochemical techniques and cell imaging. Compared with CoCu-ZIF- and CD-based cytosensors, the constructed CoCu-ZIF@CD-based one showed superior sensing performance, with an extremely low limit of detection (LOD) of 33 cells∙mL−1 and a wide range of suspension concentration of 1 × 102–1 × 105 cells∙mL−1 B16-F10 cells. The developed cytosensor also demonstrated excellent detection performance, including cell imaging properties, good selectivity, high stability, and good reproducibility. By anchoring other probe molecules, the constructed CoCu-ZIF@CD-based biosensor can be extensively explored for early diagnosis of other analytes, thereby widening the applications of porous organic frameworks in biosensing and biomedical fields.
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Funding
This work was supported by the Programs for the National Natural Science Foundation of China (NSFC: Account Nos. U1604127, 81601082, and 81371363) and China Postdoctoral Science Foundation (2019M660175).
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Liu, Y., Huang, S., Li, J. et al. 0D/2D heteronanostructure–integrated bimetallic CoCu-ZIF nanosheets and MXene-derived carbon dots for impedimetric cytosensing of melanoma B16-F10 cells. Microchim Acta 188, 69 (2021). https://doi.org/10.1007/s00604-021-04726-z
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DOI: https://doi.org/10.1007/s00604-021-04726-z