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Related Experiment Videos

Electrical detection of single viruses.

Fernando Patolsky1, Gengfeng Zheng, Oliver Hayden

  • 1Department of Chemistry and Chemical Biology, Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 15, 2004
PubMed
Summary

Scientists developed a new method to detect single virus particles in real-time using nanowire field-effect transistors. This technology offers highly selective and rapid detection of specific viruses like influenza A.

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Virology

Background:

  • Accurate and rapid detection of viruses is crucial for public health.
  • Current methods often lack the sensitivity or speed for real-time monitoring.
  • Nanowire field-effect transistors (FETs) offer potential for highly sensitive biosensing.

Purpose of the Study:

  • To develop a direct, real-time electrical detection method for single virus particles.
  • To achieve high selectivity in identifying specific viral agents.
  • To explore the potential for large-scale integration of nanowire devices for multiplexed viral detection.

Main Methods:

  • Utilized nanowire field-effect transistor arrays functionalized with antibodies specific to target viruses.
  • Performed simultaneous electrical and optical measurements using fluorescently labeled viruses.

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  • Conducted pH-dependent studies to elucidate the detection mechanism and binding kinetics.

    • Main Results:

    • Demonstrated discrete electrical conductance changes upon binding and unbinding of single influenza A virus particles.
    • Achieved high selectivity, distinguishing influenza A from paramyxovirus and adenovirus.
    • Confirmed that electrical signals correspond to single virus interactions via simultaneous optical measurements.
    • Showcased the ability to rapidly determine isoelectric points and binding kinetics.
    • Successfully demonstrated parallel detection of multiple distinct viruses (influenza and adenovirus) using antibody-modified nanowire devices.

    Conclusions:

    • Nanowire FETs provide a highly selective and direct electrical detection method for single virus particles.
    • The field-effect mechanism allows for rapid characterization of virus properties and binding dynamics.
    • Potential for large-scale integration enables simultaneous detection of multiple viral threats at the single-particle level.