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Related Experiment Videos

High sensitivity immunoassays using particulate fluorescent labels.

M Hall1, I Kazakova, Y M Yao

  • 1Pharmaceutical Discovery Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, USA.

Analytical Biochemistry
|July 23, 1999
PubMed
Summary
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Polystyrene fluorescent microspheres offer superior sensitivity as labels in direct-detection immunoassays compared to soluble reporters. This particulate label approach enhances detection limits for antigens like mouse IgG.

Area of Science:

  • Biotechnology
  • Immunochemistry
  • Analytical Chemistry

Background:

  • Direct-detection immunoassays require sensitive labeling strategies.
  • Enzymatic amplification is a common but complex method for signal enhancement.
  • Particulate labels offer an alternative to soluble reporters in immunoassays.

Purpose of the Study:

  • To evaluate polystyrene fluorescent microspheres as sensitive labels in direct-detection heterogeneous equilibrium sandwich immunoassays.
  • To compare the sensitivity of particulate fluorescent labels with soluble reporters using mouse IgG as a model antigen.
  • To optimize assay parameters for maximal sensitivity using fluorescent microsphere labels.

Main Methods:

  • Development of a direct-detection heterogeneous equilibrium "sandwich" immunoassay using 96-well plates.

Related Experiment Videos

  • Utilized mouse IgG as a model antigen.
  • Compared polystyrene fluorescent microspheres (particulate reporter) with soluble reporters for antigen detection.

    • Main Results:

    • The fluorescent microsphere label achieved a limit of detection of 0.2 ng/ml for mouse IgG, significantly lower than the 50 ng/ml limit for soluble reporters.
    • Assay sensitivity was dependent on surface antibody densities and reporter bead concentration.
    • Pre-forming the reporter antibody/microsphere complex and adding it to trapped antigen improved sensitivity.
    • Maximal binding of particulate reporters occurred after 20 hours incubation with 1.4 x 10^9 beads/ml.

    Conclusions:

    • Polystyrene fluorescent microspheres serve as highly sensitive labels in direct-detection immunoassays.
    • Particulate fluorescent labels provide a sensitive alternative to soluble reporters without enzymatic amplification.
    • Optimization of antibody densities and pre-formed complexes enhances assay sensitivity.