Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 732, Issue -, Pages 38-45Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2014.08.030
Keywords
Carcinoembryonic antigen; Multiwalled carbon nanotubes; Concanavalin A; Cysteine
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Funding
- National Natural Science Foundation of China [30800247, 20805043]
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A sandwich-type amperometric immunosensor for carcinoembryonic antigen was fabricated by using functionalized carbon nanotubes decorated with concanavalin A along with horseradish peroxidase-labeled carcinoembryonic secondary antibodies. The HRP-Ab(2) was assembled onto carbon nanotubes templates based on the biospecific affinity between concanavalin A and HRP. The carcinoembryonic antibody was immobilized on the gold electrode modified by monolayer cysteine. The response is linear in the range of 0.05-5 ng mL(-1) and 5-200 ng mL(-1), with a detection limit of 0.018 ng mL(-1). The biosensor can be used in serum directly. (C) 2014 Elsevier B.V. All rights reserved.
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