title: Bioelectronic nose with high sensitivity and selectivity using chemically functionalized carbon nanotube combined with human olfactory receptor.
abstract: Single-walled carbon nanotubes (swCNTs) hold great promise for use as molecular wires because they exhibit high electrical conductivity and chemical stability. However, constructing swCNT-based transducer devices requires controlled strategies for assembling biomolecules on swCNTs. In this study, we proposed a chemically modified swCNT. The swCNT was functionalized with 1,5-diaminonaphthalene via π-stacking, for reliable attachment of the human olfactory receptor 2AG1 (hOR2AG1). The human olfactory receptor was then anchored. We investigated the use of this functionalized CNT in the fabrication of a highly sensitive and selective bioelectronic nose. For the bioelectronic nose, the swCNT-field effect transistor (FET) platform was composed of polyethylene glycol (PEG)-coated regions to prevent non-specific absorption and chemically modified swCNTs regions containing hOR2AG1, which can bind to the specific odorant. This approach allowed us to create well-defined micron-scale patterns of hOR2AG1 on the swCNTs. Our bioelectronic nose displayed ultrahigh sensitivity down to concentrations as low as 1fM due to the enhanced hOR2AG1-odorant interaction through the tight binding of hOR2AG1 on the chemically modified swCNTs. In addition, the approach described here may provide an alternative route for multiplexed detection of diverse odorants and to improve the sensitivity of sensor devices.
authors.affiliation: School of Chemical and Biological Engineering, Bio-MAX Institute, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Sang Hun
authors.initials: SH
authors.lastname: Lee
authors.forename: Hye Jun
authors.initials: HJ
authors.lastname: Jin
authors.forename: Hyun Seok
authors.initials: HS
authors.lastname: Song
authors.forename: Seunghun
authors.initials: S
authors.lastname: Hong
authors.forename: Tai Hyun
authors.initials: TH
authors.lastname: Park
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D015153:Blotting, Western; D006801:Humans; D037742:Nanotubes, Carbon / Q000737:chemistry*; D018035:Receptors, Odorant / Q000378:metabolism*; D013499:Surface Properties; D014173:Transistors, Electronic
chemical_list: D037742:Nanotubes, Carbon; C514887:OR2AG1 protein, human; D018035:Receptors, Odorant