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A generic sandwich-type biosensor with nanomolar detection limits.

Antje J Baeumner1, Caroline Jones, Ching Yee Wong

  • 1Dept. of Biological and Environmental Engineering, Cornell University, Ithaca, NY, USA. ajb23@cornell.edu

Analytical and Bioanalytical Chemistry
|June 25, 2004
PubMed
Summary
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A novel biosensor system enables rapid and sensitive detection of nucleic acid sequences and antigens. This universal biosensor platform uses liposome amplification and a simple coupling reaction for adaptable, specific detection in labs or field tests.

Area of Science:

  • Biomedical Engineering
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Developing sensitive and rapid detection methods for nucleic acids and antigens is crucial for diagnostics and research.
  • Existing biosensor technologies often lack versatility or require complex modifications for different targets.

Purpose of the Study:

  • To develop a universal biosensor platform for the quantitative detection of nucleic acid sequences.
  • To demonstrate the adaptability of this platform for antigen detection through a simple coupling reaction.

Main Methods:

  • A dipstick-type biosensor utilizing liposome amplification and a sandwich assay format with optical detection was designed.
  • A generic biosensor with streptavidin-coated liposomes and anti-fluorescein antibody-functionalized membranes was created.

Related Experiment Videos

  • Target specificity was achieved by incubating the generic biosensor with biotin- and fluorescein-labeled oligonucleotides and the target nucleic acid sequence.

    • Main Results:

    • The biosensor successfully detected RNA sequences from B. anthracis, C. parvum, and E. coli with high sensitivity (10 fmol to 1000 fmol).
    • The system demonstrated quantitative detection without altering assay conditions, even with amplified RNA sequences.
    • The generic biosensor platform proved effective and comparable to specific biosensors, highlighting its versatility.

    Conclusions:

    • The developed universal biosensor is a simple, rapid, and sensitive tool for detecting nucleic acid sequences.
    • The platform's design allows for straightforward adaptation to detect antigens by immobilizing antibodies.
    • This versatile biosensor is suitable for both laboratory use and field testing applications.