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  Label-free impedimetric aptasensor for lysozyme detection based on carbon nanotube-modified screen-printed electrodes

Rohrbach, F., Karadeniz, H., Erdem, A., Famulok, M., & Mayer, G. (2012). Label-free impedimetric aptasensor for lysozyme detection based on carbon nanotube-modified screen-printed electrodes. Analytical biochemistry, 421(2), 454-9. doi:10.1016/j.ab.2011.11.034.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-6403-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-6404-8
Genre: Journal Article
Alternative Title : Anal. Biochem.

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Rohrbach-2012-Label-free impedimet.pdf (Any fulltext), 559KB
 
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Rohrbach, F., Author
Karadeniz, H., Author
Erdem, A., Author
Famulok, M.1, Author
Mayer, G., Author
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Free keywords: Aptamers, Nucleotide/*chemistry Electrochemistry/methods *Electrodes Muramidase/*analysis *Nanotubes, Carbon
 Abstract: We report on the direct electrochemical detection of aptamer-protein interactions, namely between a DNA aptamer and lysozyme (LYS) based on electrochemical impedance spectroscopy (EIS) technique. First, the affinity of the aptamer to LYS and control proteins was presented by using filter retention assay. An amino-modified version of the DNA aptamer-recognizing lysozyme was covalently immobilized on the surface of multiwalled carbon nanotube-modified screen-printed electrodes (MWCNT-SPEs), which were employed for measurements and have improved properties compared with bare SPEs. This carbon nanotube setup enabled the reliable monitoring of the interaction of lysozyme with its cognate aptamer by EIS transduction of the resistance to charge transfer (R(ct)) in the presence of 2.5 mM [Fe(CN)(6)](3)(-)/(4)(-). This assay system provides a means for the label-free, concentration-dependent, and selective detection of lysozyme with an observed detection limit of 12.09 mug/ml (equal to 862 nM).

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 Dates: 2012
 Publication Status: Published in print
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 Identifiers: Other: 22200651
DOI: 10.1016/j.ab.2011.11.034
ISSN: 1096-0309 (Electronic)
ISSN: 0003-2697 (Linking)
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Title: Analytical biochemistry
Source Genre: Journal
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Pages: - Volume / Issue: 421 (2) Sequence Number: - Start / End Page: 454 - 9 Identifier: -