Journal
BIOSENSORS & BIOELECTRONICS
Volume 114, Issue -, Pages 44-51Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2018.05.016
Keywords
Patchy gold; Fe3O4; Hydrogen peroxide; Bipolar electrode; Paper-based; Carcinoembryonic antigen
Categories
Funding
- National Natural Science Foundation of China [21575022, 21535003, 21375006]
- Fundamental Research Funds for the Central Universities [2242016K41055]
- Qing Lan Project
- Priority Academic Program Development of Jiangsu Higher Education Institutions [1107047002]
- Foundation of Key Laboratory of Sensor Analysis of Tumor Marker
- Qingdao University of Science and Technology [STAM201801]
- MOE
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In this work, novel multifunctional patchy gold coated Fe3O4 hybrid nanoparticles (PG-Fe3O4 NPs) have been successfully synthesized in aqueous medium via a facile adsorption-reduction method. A rational formation mechanism has been proposed by monitoring the morphological evolution. The PG-Fe3O4 NPs retained the good magnetic property and exhibited excellent catalytical effeciency towards the electrochemical reduction of hydrogen peroxide. Chronoamperometric and amperometric experiments indicated a relatively high catalytic rate constant of 3.13 x 10(5) M-1 s(-1), a high sensitivity of 578.87 pA mM(-1) cm(-2) and a low Michaelis-Menten constant of 462 M. Meanwhile, the introduction of patchy gold could help biofunctionalization via Au-S bond for different biodetection and biosensing purposes. Here, as an example, thiol-terminated aptamers were immobilized onto the patchy gold part as a signal probe to detect carcinoembryonic antigen (CEA). A related paper based bipolar electrode-electrochemiluminescence (pBPE-ECL) aptasensor was fabricated as the low-cost, disposable and miniature platform. To improve the sensitivity, Au nanodendrites were electrodeposited at the BPE cathode as the matrix for Apt1 immobilization. This aptasensor showed a wide linear range of 0.1 pg mL(-1)-15 ng mL(-1) with a low detection limit of 0.03 pg mL(-1), remaining competitive against other ones, and also demonstrating the PG-Fe3O4 NPs have promising potential for catalysis and bioassays.
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