期刊
BIOSENSORS & BIOELECTRONICS
卷 30, 期 1, 页码 229-234出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2011.09.017
关键词
Carcinoembryoninc antigen; Electrochemical immunosensor; Multiarmed star-like platinum nanowires; Nanolabels; Signal amplification
类别
资金
- National Natural Science Foundation of China [21075019, 41176079, 20735002]
- Research Fund for the Doctoral Program of Higher Education of China [20103514120003]
- Award Program for Minjiang Scholar Professorship [XRC-0929]
- National Science Foundation of Fujian Province [2011J06003]
- 973 National Basic Research Program of China [2010CB732403]
A new electrochemical immunoassay strategy for direct detection of carcinoembryoninc antigen (CEA) in serum was developed by using multiarmed star-like platinum nanowires (PtNWs) with biomolecular assembly as signal tags on an anti-CEA-functionalized graphene sensing platform. Initially, the PtNWs were synthesized via a wet chemical method, and then the synthesized PtNWs were used for the co-immobilization of CEA and horseradish peroxidase (HRP). Compared with platinum nanoparticles, the prepared PtNWs could provide a large room for the conjugation of HRP and CEA. With a competitive-type immunoassay format, the assay was performed in two types of supporting electrolytes including new born cattle serum (NBCS) and acetate buffer solution (ABS, pH 5.5), respectively. Similar detection limit (LOD) of 5.0 pg mL(-1) vs. 1.0 pg mL(-1) but narrower dynamic working linear range of 0.01-60 ng mL(-1) vs. 0.002-80 ng mL(-1) was obtained toward CEA standards in the NBCS compared to the ABS. The intra-assay coefficients of variation (CVs) were 4.3%, 8.6%, and 6.2% at 0.05, 10, and 40 ng mL(-1) CEA, respectively, while the inter-assay CVs were 7.6%, 10.5%, and 8.9% at the above-mentioned levels, respectively. In addition, the selectivity and stability of the electrochemical immunosensor were acceptable. Importantly, the developed method was used to assay clinical serum specimens, receiving a good relation with those obtained from the referenced method. (C) 2011 Elsevier B.V. All rights reserved.
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