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Related Experiment Video

Updated: Jul 4, 2026

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
14:53

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

Published on: September 10, 2014

Dip pen nanolithography functionalized electrical gaps for multiplexed DNA detection.

Shifeng Li1, Sandra Szegedi, Edgar Goluch

  • 1Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign 208 North Wright Street, Urbana, Illinois 61801, USA.

Analytical Chemistry
|July 3, 2008
PubMed
Summary

Dip pen nanolithography enables precise DNA electrical detection for diagnostics. This method uses functionalized electrical gaps and silver-enhanced nanoparticles for sensitive, multiplexed DNA detection at the point-of-care.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Molecular Diagnostics

Background:

  • Nanoparticle-based DNA detection offers potential for point-of-care diagnostics.
  • Accurate functionalization of electrical gaps is crucial for multiplexed DNA detection.

Purpose of the Study:

  • To demonstrate the use of dip pen nanolithography (DPN) for precise functionalization of electrical gaps for multiplexed DNA detection.
  • To evaluate the sensitivity and specificity of DPN-functionalized electrical gaps for detecting target DNA sequences.

Main Methods:

  • Utilizing dip pen nanolithography (DPN) to write capture single-stranded DNA (ssDNA) onto electrical gaps.
  • Employing gold nanoparticles functionalized with ssDNA for hybridization detection.
  • Implementing silver enhancement to amplify the signal from hybridized DNA-nanoparticle complexes.

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  • Measuring the change in electrical resistance across the gaps to quantify DNA detection.

    • Main Results:

    • DPN successfully functionalized electrical gaps for specific DNA hybridization.
    • Multiplexed detection of two different target ssDNAs on the same chip was achieved.
    • A lowest detection limit of 10 picomolar (pM) was demonstrated.
    • Resistance drop correlated with the formation of metal nanoparticle-DNA complexes.

    Conclusions:

    • DPN is a viable technique for creating high-density multiplexed DNA assay chips.
    • This approach shows promise for sensitive and specific point-of-care DNA diagnostics.
    • The silver-enhanced nanoparticle detection method enhances the sensitivity of electrical DNA detection.