An electrochemical immunosensor for sensitive detection of the tumor marker carcinoembryonic antigen (CEA) based on three-dimensional porous nanoplatinum/graphene

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Abstract

Carcinoembryonic antigen (CEA) is an important broad-spectrum tumor marker. The quantitative detection of a low concentration of CEA has important medical significance. In this study, three-dimensional porous graphene-oxide-supported platinum metal nanoparticles (3DPt/HGO) composites were prepared by a wet chemical method and modified on an electrode with enhanced conductivity, a large surface area, and good adsorption of immobilizing antibodies (Ab1). Horseradish peroxidase (HRP)-functionalized Au nanoparticles were fabricated to label the secondary antibodies (Ab2). The proposed immunosensor showed a good linear relationship in the range of 0.001-150 ng/mL for CEA and a detection limit of 0.0006 ng/mL. The immunosensor had high sensitivity, good stability and reproducibility, and has great application prospects for the clinical diagnosis of cancer.

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Jing, A., Xu, Q., Feng, W., & Liang, G. (2020). An electrochemical immunosensor for sensitive detection of the tumor marker carcinoembryonic antigen (CEA) based on three-dimensional porous nanoplatinum/graphene. Micromachines, 11(7). https://doi.org/10.3390/mi11070660

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