Carbon nanotube electric immunoassay for the detection of swine influenza virus H1N1

Dongjin Lee, Yogesh Chander, Sagar M. Goyal, Tianhong Cui

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

A low-cost, label-free, ultra-sensitive electric immunoassay is developed for the detection of swine influenza virus (SIV) H1N1. The assay is based on the excellent electrical properties of single-walled carbon nanotubes (SWCNTs). Antibody-virus complexes influence the conductance of underlying SWCNT thin film, which has been constructed by facile layer-by-layer self-assembly. The basic steps of conventional immunoassay are performed followed by the electric characterization of immunochips at the last stage. The resistance of immunochips tends to increase upon surface adsorption of macromolecules such as poly-l-lysine, anti-SIV antibodies, and SIVs during the assay. The resistance shift after the binding of SIV with anti-SIV antibody is normalized with the resistances of bare devices. The sensor selectivity tests are performed with non-SIVs, showing the normalized resistance shift of 12% as a background. The detection limit of 180 TCID50/ml of SIV is obtained suggesting a potential application of this assay as point-of-care detection or monitoring system. This facile CNT-based immunoassay also has the potential to be used as a sensing platform for lab-on-a-chip system.

Original languageEnglish (US)
Pages (from-to)3482-3487
Number of pages6
JournalBiosensors and Bioelectronics
Volume26
Issue number8
DOIs
StatePublished - Apr 15 2011

Keywords

  • Biosensor
  • Carbon nanotube
  • Immunoassay
  • Swine influenza virus H1N1
  • Virus sensor

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