Electrical detection of single viruses

AUTOR(ES)

Patolsky, Fernando

FONTE

National Academy of Sciences

RESUMO

We report direct, real-time electrical detection of single virus particles with high selectivity by using nanowire field effect transistors. Measurements made with nanowire arrays modified with antibodies for influenza A showed discrete conductance changes characteristic of binding and unbinding in the presence of influenza A but not paramyxovirus or adenovirus. Simultaneous electrical and optical measurements using fluorescently labeled influenza A were used to demonstrate conclusively that the conductance changes correspond to binding/unbinding of single viruses at the surface of nanowire devices. pH-dependent studies further show that the detection mechanism is caused by a field effect, and that the nanowire devices can be used to determine rapidly isoelectric points and variations in receptor-virus binding kinetics for different conditions. Lastly, studies of nanowire devices modified with antibodies specific for either influenza or adenovirus show that multiple viruses can be selectively detected in parallel. The possibility of large-scale integration of these nanowire devices suggests potential for simultaneous detection of a large number of distinct viral threats at the single virus level.

Documentos Relacionados

• Sensitive Detection of RNA Viruses Associated with Gastroenteritis by a Hanging-Drop Single-Tube Nested Reverse Transcription-PCR Method
• Single-phase resistive superconductor electrical current limiter
• ELECTRICAL STIMULATION OF THE INTERNODES OF SINGLE FIBERS OF DESHEATHED NERVES*
• An approach to electrical modeling of single and multiple cells
• Transgenic cell lines for detection of animal viruses.