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Analytical Characterization of Label-Free Immunosensor Subsystems Based on Multi-Walled Carbon Nanotube Array-Modified Gold Interface

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In the present work, we report characterization studies of antigen(Ag)-antibody (Ab) interaction based on the multi-walled carbon nanotube array-modified gold electrode for label-free electrochemical immunosensor. -COOH functionalization of MWCNT was suggested by FTIR spectroscopy. Images from atomic force microscopy (AFM) and RAMAN spectroscopy confirmed the interaction of Ab on the gold interface based on the MWCNT array. A cyclic voltammetric study exhibited a linear response in phosphate buffered saline (PBS) solution including 1mM K3Fe (CN) 6 at pH 7.4 with PSA concentrations over a range of 2 to 40 ngmL-1, and a calculated detection limit of 0.56 ngmL-1.
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Keywords: Atomic force microscopy; RAMAN spectroscopy; carbon nanotube; cyclic voltammetry; immunosensor; label free

Document Type: Research Article

Publication date: January 1, 2015

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  • Combinatorial Chemistry & High Throughput Screening publishes full length original research articles and reviews describing various topics in combinatorial chemistry (e.g. small molecules, peptide, nucleic acid or phage display libraries) and/or high throughput screening (e.g. developmental, practical or theoretical). Ancillary subjects of key importance, such as robotics and informatics, will also be covered by the journal. In these respective subject areas, Combinatorial Chemistry & High Throughput Screening is intended to function as the most comprehensive and up-to-date medium available. The journal should be of value to individuals engaged in the process of drug discoveryand development, in the settings of industry, academia or government.
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