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Culture and in situ H2O2-mediated electrochemical study of cancer cells using three-dimensional scaffold based on graphene foam coated with Fe3O4 nanozyme

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Abstract

For real-time evaluation of the cell behavior and function under in vivo-like 3D environment, the 3D functionalized scaffolds simultaneously integrate the function of 3D cell culture, and electrochemical sensing is a convincing candidate. Herein, Fe3O4 nanoparticles as the nanozyme (peroxide oxidase mimics) were modified on graphene foam scaffold to construct a 3D integrated platform. The platform displayed a wide linear range of 100 nM to 20 μM and a high sensitivity of 53.2 nA μM−1 toward detection of hydrogen peroxide (H2O2) under the working potential of + 0.6 V (vs. Ag/AgCl). The obtained 3D scaffold also displayed satisfactory selectivity toward the possible interferents that appeared in the cell culture environment. Furthermore, the cells still maintained high cell viability (almost 100%) after their growth and proliferation on the scaffold for 7 days. With the superior performance on cell culture and electrochemical monitoring, the functions on the 3D culture of MCF-7 or HeLa cells and in situ monitoring of cell-released H2O2 was easily achieved on this 3D platform, which show its great application prospects on further cancer-related disease diagnosis or drug screening.

Graphical abstract

A nanozyme-based three-dimensional graphene scaffold was successfully constructed for cell culture and identification of cancer cells through in situ electrochemical monitoring of the cell-released H2O2.

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Funding

We sincerely appreciate the support from the National Natural Science Foundation of China (Nos. 21804117), the Key Scientific and Technological Project of Henan Province (212102210471, 182102310703) and the Nanhu Scholars Program for Young Scholars of XYNU.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People’s Republic of China

    Xue-Bo Hu, Ning Shang, Xiao-Hui Chen, Zi-He Jin, Meng-Yuan He, Tian Gan & Yan-Ming Liu

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  1. Xue-Bo Hu
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Hu, XB., Shang, N., Chen, XH. et al. Culture and in situ H2O2-mediated electrochemical study of cancer cells using three-dimensional scaffold based on graphene foam coated with Fe3O4 nanozyme. Microchim Acta 189, 89 (2022). https://doi.org/10.1007/s00604-022-05203-x

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