Abstract
A three-dimensional porous network graphene aerogel (GAs) with large specific area and excellent conductivity was loaded with β-cyclodextrin polymer (Pβ-CD) to serve as a support for immobilization of antibodies. A highly sensitive immunosensor for the cancer marker carbohydrate antigen 15–3 (CA15–3) was designed based on the use of Pβ-CD/GAs. The large specific area of GAs warrants high loading with antibodies, and their excellent electrical conductivity warrants strong electrical signals. Based on the synergistic effect of GAs and Pβ-CD, an immunoassay was designed that is making use of hexacyanoferrate as an electrochemical probe and having a pleasantly low working potential of 0.2 V (vs. SCE). Response is linear in the 0.1 mU mL−1 to 100 U mL−1 activity range, and the lower detection limit is 0.03 mU mL−1 (at S/N = 3). The immunoassay is stable, selective and reproducible. It was applied to the analysis of spiked samples, and results were satisfactory.
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Acknowledgements
We are grateful to the National Natural Science Foundation of China (21665010, 31741103, 51572117 and 51302117), the outstanding youth fund and 5511 Project of Jiangxi Province (20162BCB23027 and 20165BCB18016), Jiangxi Provincial, Department of Education (GJJ12595), Natural Science Foundation of Jiangxi Province (20171BAB203015) for their financial support of this work.
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Jia, H., Tian, Q., Xu, J. et al. Aerogels prepared from polymeric β-cyclodextrin and graphene aerogels as a novel host-guest system for immobilization of antibodies: a voltammetric immunosensor for the tumor marker CA 15–3. Microchim Acta 185, 517 (2018). https://doi.org/10.1007/s00604-018-3056-3
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DOI: https://doi.org/10.1007/s00604-018-3056-3