Journal
BIOSENSORS & BIOELECTRONICS
Volume 26, Issue 2, Pages 627-631Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.07.012
Keywords
Dumbbell-like; Au-Fe3O4 nanoparticles; Cancer biomarker; Prostate specific antigen; Graphene
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Funding
- Natural Science Foundation of China [20704027]
- Natural Science Foundation of Shandong Province [Y2008B44]
- Key Subject Research Foundation of Shandong Province [XTD0705]
- National High-Tech Project of China (863-Project) [2007AA021902]
- Shandong Provincial Education Department [J08LC54]
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In this work, we developed a novel kind of label based on dumbbell-like Au-Fe3O4 nanoparticles (NPs) for the preparation of electrochemical immunosensor for the detection of cancer biomarker prostate specific antigen (PSA). The signal amplification strategy, using the synergetic effect present in Au-Fe3O4 to increase the reduction ability of the NPs toward H2O2, improves the sensitivity and detection limit of the immunosensor. With primary anti-PSA antibody (Ab(1)) immobilized onto graphene surface and secondary anti-PSA antibody (Ab(2)) adsorbed onto the Au of the Au-Fe3O4 NPs, the immunosensor prepared through a sandwich structure displays a wide linear range (0.01-10 ng/mL), low detection limit (5 pg/mL), good reproducibility and stability. These labels for immunosensors may provide many potential applications for the detection of different biomolecules.(C) 2010 Elsevier B.V. All rights reserved.
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