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Related Experiment Videos

Detection of protein analytes via nanoparticle-based bio bar code technology.

Y Paul Bao1, Tai-Fen Wei, Phil A Lefebvre

  • 1Nanosphere, Inc., 4088 Commercial Avenue, Northbrook, Illinois 60062, USA.

Analytical Chemistry
|March 16, 2006
PubMed
Summary

A novel bio bar code assay format enhances protein detection sensitivity by over 10,000-fold, achieving attomolar detection limits without enzymes. This breakthrough improves analytical utility for ultrasensitive protein quantification.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Molecular Diagnostics

Background:

  • Ultrasensitive protein detection is crucial for early disease diagnosis and biomarker discovery.
  • Existing methods like immuno-PCR and immuno-RCA offer high sensitivity but often rely on enzymes.
  • The bio bar code technology presents a promising enzyme-free approach for protein quantification.

Purpose of the Study:

  • To introduce and validate a new format of the bio bar code technology.
  • To significantly enhance the dose response and analytical utility of the bio bar code assay.
  • To achieve attomolar detection limits for protein analytes.

Main Methods:

  • A novel bio bar code assay format was developed.
  • The technique involves sandwiching a target analyte between magnetic beads and amplifier nanoparticles.

Related Experiment Videos

  • Released bar code oligonucleotides are hybridized to microarrays and detected using silver-amplified gold nanoparticle probes.

    • Main Results:

    • The enhanced bio bar code format demonstrated a dose response improvement exceeding 10,000-fold.
    • Attomolar detection limits were achieved, surpassing traditional ELISA systems by 1000-fold.
    • A linear dose response was observed over four orders of magnitude for both target concentration and signal.
    • The assay proved analytically useful without employing enzymes.

    Conclusions:

    • The improved bio bar code assay format offers a highly sensitive and analytically useful method for protein detection.
    • This enzyme-free approach achieves attomolar sensitivity, making it valuable for biomarker discovery and diagnostics.
    • The technology demonstrates a significant advancement over existing ultrasensitive protein detection techniques.