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Related Experiment Videos

Single-target molecule detection with nonbleaching multicolor optical immunolabels.

S Schultz1, D R Smith, J J Mock

  • 1Department of Physics 0319, University of California, 9500 Gilman Drive, La Jolla, CA 92093, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 3, 2000
PubMed
Summary

Colloidal silver plasmon-resonant particles (PRPs) offer ultrabright, nonbleaching optical reporting for biological assays. These nanosized scatterers enable ultrasensitive detection, potentially replacing traditional labels in diagnostics and research.

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Optical Physics

Background:

  • Established biological assay labels (radioactivity, fluorescence, etc.) have limitations.
  • Need for highly sensitive, stable, and easily detectable reporters in biological research and diagnostics.

Purpose of the Study:

  • Introduce and demonstrate colloidal silver plasmon-resonant particles (PRPs) as novel optical reporters.
  • Evaluate PRPs as target-specific labels in biological assays.
  • Propose PRPs as an alternative or complement to existing labeling technologies.

Main Methods:

  • Preparation of colloidal silver PRPs with tunable scattering peaks.
  • Surface coating of PRPs with standard ligands for target specificity.
  • Application of PRPs in in situ hybridization and immunocytology assays.

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  • Microscopic observation using dark-field microscopy with white-light illumination.
  • Development of a sandwich immunoassay using PRP counts as the signal.

    • Main Results:

    • PRPs function as ultrabright, nanosized optical scatterers.
    • PRPs can be prepared with specific scattering colors across the visible spectrum.
    • PRPs successfully labeled targets in in situ hybridization and immunocytology.
    • PRP labels are nonbleaching and readily detectable individually.
    • A sandwich immunoassay demonstrated signal generation based on PRP counts.

    Conclusions:

    • Colloidal silver PRPs are effective optical reporters for biological assays.
    • PRPs offer advantages in brightness, stability, and detection sensitivity.
    • PRPs have the potential to replace or enhance current labeling methods in various biological and diagnostic applications.
    • The nonbleaching nature of PRPs enables ultrasensitive assays, including single-target molecule detection.