期刊
ANALYTICA CHIMICA ACTA
卷 722, 期 -, 页码 100-106出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.01.059
关键词
Immunosensor; Benzo[a]pyrene; Fe3O4/polyaniline; Carbon nanospheres
资金
- Natural Science Foundation of China [21105030]
- National Basic Research Program of China [2009CB421601]
- Student Innovative Project of Guangdong Province [105641003]
- South China Agricultural University [2009B010100001]
- Guangdong Science and Technology Department [2010B080701002, 2011B080701026]
An electrochemical immunosensor, basing on a dual amplification strategy by employing a biocompatible Fe3O4/polyaniline/Nafion (Fe3O4/PANI/Nafion) layer as sensor platform and multi-enzyme-antibody functionalized highly-carbonized spheres (multi-HRP-HCS-Ab(2)) as label, was constructed for sensitive detection of benzo[a]pyrene (BaP). The stable film, Fe3O4/PANI/Nafion, can not only immobilize biomolecules, but also catalyze the reduction of hydrogen peroxide, indicating an accelerated electron transfer pathway of the platform. The experimental conditions, including the concentration of Nation, concentration of Fe3O4/polyaniline (Fe3O4/PANI), pH of the detection solution and concentrations of biomolecules, were studied in detail. Basing on a competitive immunoassay, the current change was proportional to the logarithm of BaP concentration in the range of 8 pM and 2 nM with the detection limit of 4pM. The proposed immunosensor exhibited acceptable reproducibility and stability. This new type of dual amplification strategy may provide potential applications for the detection of environmental pollutants. (c) 2012 Elsevier B.V. All rights reserved.
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