期刊
BIOSENSORS & BIOELECTRONICS
卷 68, 期 -, 页码 586-592出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2015.01.051
关键词
Bifunctional magnetic nanobeads; Avian influenza A (H7N9) virus; Enzyme-induced metallization; Electrochemical immunosensor
类别
资金
- National Basic Research Program of China [2011CB933600]
- 863 Program [2013AA032204]
- National Natural Science Foundation of China [21175100, 21475099]
- Natural Science Foundation of Hubei Province [2014CFA003]
- Fundamental Research Funds for the Central Universities [2042014kf0196]
Bifunctional magnetic nanobeads (bi-MBs) were fabricated by co-immobilizing target recognition molecules and signal molecules on a magnetic nanobead surface, which were used as both separation and enrichment carriers and signal carriers. The bi-MBs could capture and separate avian influenza A (H7N9) virus (H7N9 AIV) from complex samples efficiently based on the specific reaction between antigen-antibody and their good magnetic response, which simplified sample pretreatment and saved the detection time. Taking advantages of their high surface to volume ratio and rich surface functional groups, multiple alkaline phosphatase (ALP) signal molecules were tethered on the surface of bi-MBs which greatly amplified the detection signal. As an efficient signal amplification strategy, enzyme-induced metallization had been integrated with bi-MBs and anodic stripping voltammetry to construct an ultrasensitive electrochemical immunosensor for H7N9 AIV detection. Under the optimal conditions, the introduction of bi-MBs could amplify the detection signal in about four times compared with the same immunoassay without MBs, and the method showed a wide linear range of 0.01-20 ng/mL with a detection limit of 6.8 pg/mL. The electrochemical immunosensor provides a simple and reliable platform with high sensitivity and selectivity which shows great potential in early diagnosis of diseases. (C) 2015 Elsevier B.V. All rights reserved.
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