Abstract
We report on a giant magnetoresistance (GMR) based immunosensor for the carcinoembryonic antigen (CEA) labeled with superparamagnetic microparticles (Dynabeads). The GMR sensor contains 200 GMR strips and was fabricated by micro-electromechanical system (MEMS) technology. This system can detect Dynabeads in concentrations down to 10 ng⋅mL−1. Sandwich immunoassays were employed on the surface of a gold film modified with a self-assembled monolayer and using biotinylated secondary antibody against CEA and streptavidinylated Dynabeads. With DC magnetic fields in the range of 40 to 90 Oe, CEA can be detected with a detection limit as low as 10 pg⋅mL−1. Samples spiked with different concentrations of CEA can be distinguished clearly, and the method is deemed to be well suited for clinical use.
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Acknowledgments
This work was supported by The National Natural Science Foundation of China (No. 61273065), National Science and Technology Support Program (2012BAK08B05) and National Key Laboratory Research Fund (9140C790403110C7905), Natural Science Foundation of Shanghai (13ZR1420800), Support fund of Joint research center for advanced aerospace technology of Shanghai Academy of Spaceflight Technology-Shanghai Jiao Tong University, the Analytical and Testing Center in Shanghai Jiao Tong University, the Center for Advanced Electronic Materials and Devices in Shanghai Jiao Tong University.
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Sun, Xc., Lei, C., Guo, L. et al. Giant magneto-resistance based immunoassay for the tumor marker carcinoembryonic antigen. Microchim Acta 183, 1107–1114 (2016). https://doi.org/10.1007/s00604-015-1686-2
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DOI: https://doi.org/10.1007/s00604-015-1686-2