Journal
BIOSENSORS & BIOELECTRONICS
Volume 44, Issue -, Pages 101-107Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.01.025
Keywords
Multiplex electrochemiluminescence immunoassay; Tumor markers; Quantum dots; Graphene; Chitosan
Categories
Funding
- National Natural Science Foundation of China [81273130, 81072336]
- Science and Technology Department of Zhejiang Province of China [2012R405061, 2011R405051]
- Ningbo Science and Technology Bureau [2011C50037]
- Scientific Research Foundation of Graduate School of Ningbo University
- K.C. Wong Magna Fund in Ningbo University
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A multiplex electrochemiluminescence (ECL) immunoassay for simultaneous determination of two different tumor markers, alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA), using multicolor quantum dots as labels and graphene as conducting bridge was developed. Herein, a typical sandwich immune complex was constructed on the glass carbon electrode, with QDs(525) and QDs(625) labeled on secondary anti-AFP and anti-CEA antibodies, respectively, thus to obtain distinguishable ECL signals. Because most of those QDs labeled on secondary antibodies were beyond the space domain of the ECL reaction, graphene was used as a conducting bridge to promote the electron transfer between QDs and the electrode, leading to about 30-fold enhancement of the ECL intensity. Experimental results revealed that the multiplex electrochemiluminescence immunoassay enabled the simultaneous monitoring of AFP and CEA in a single run with a working range of 0.001-0.1 pg/mL. The detection limit (LOD) for both analytes at 0.4 fg/mL was very low. No obvious cross-reactivity was found. Precision, recovery and stability were satisfactory. This novel multiplex ECL immunoassay provided a simple, sensitive, specific and reliable alternative for the simultaneous detection of tumor markers in clinical laboratory. (C) 2013 Elsevier B.V. All rights reserved.
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