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PNA chips for the detection of the genetic polymorphism of Cytochrome P450 2C19 (CYP2C19), a well-known enzyme related to the metabolism of therapeutic drugs, were electrically-interfaced with interdigitated nanogap electrodes (INEs). The average gap distance and effective length of
the INEs were about ∼70 nm and ∼140 μm, respectively. Those INEs having the aspect ratio of about 2000, were prepared by the combination of the photolithography (for the formation of initial electrodes) and the surface-catalyzed chemical deposition (for the gap narrowing),
without the e-beam lithography. The PNA probes for the detection of CYP2C19 were immobilized in the gap region of INEs via Schiff base formation. The I–V characteristics clearly showed a sharp increase in the conductance between the nanogap electrodes upon the PNA-DNA hybridization,
followed by the adsoprtion of functionalized Au nanoparticles. Four different target DNAs for the diagnosis of CYP2C19 polymorphism were successfully detected and discriminated with the INE-based PNA chips.
Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.