A simple and direct electrochemical detection of interferon-gamma using its RNA and DNA aptamers
SCIE
SCOPUS
- Title
- A simple and direct electrochemical detection of interferon-gamma using its RNA and DNA aptamers
- Authors
- Min, K; Cho, M; Han, SY; Shim, YB; Ku, J; Ban, C
- Date Issued
- 2008-07-15
- Publisher
- ELSEVIER ADVANCED TECHNOLOGY
- Abstract
- Tuberculosis is the most frequent cause of infection-related death worldwide. We constructed a simple and direct electrochemical sensor to detect interferon (IFN)-gamma, a selective marker for tuberculosis pleurisy, using its RNA and DNA aptamers. IFN-gamma was detected by its 5'-thiol-modified aptamer probe immobilized on the gold electrode. Interaction between IFN-gamma and the aptamer was recorded using electrochemical impedance spectroscopy and quartz crystal microbalance (QCM) with high sensitivity. The RNA-aptamer-based sensor showed a low detection limit of 100 fM, and the DNA-aptamer-based sensor detected IFN-gamma to 1 pM in sodium phosphate buffer. With QCM analysis, the aptamer immobilized on the electrode and IFN-gamma bound to the aptamer probe was quantified. This QCM result shows that IFN-gamma exists in multimeric forms to interact with the aptamers, and the RNA aptamer prefers the high multimeric state of IFN-gamma. Such a preference may describe the low detection limit of the RNA aptamer shown by impedance analysis. In addition, IFN-gamma was detected to 10 pM by the DNA aptamer in fetal bovine serum, a mimicked biological system, which has similar components to pleural fluid. (c) 2008 Elsevier B.V. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26486
- DOI
- 10.1016/j.bios.2008.02.021
- ISSN
- 0956-5663
- Article Type
- Article
- Citation
- BIOSENSORS & BIOELECTRONICS, vol. 23, no. 12, page. 1819 - 1824, 2008-07-15
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