Instrument to detect near-infrared fluorescence in solid-phase immunoassay

Area of Science:

• Analytical Chemistry
• Biomedical Instrumentation
• Spectroscopy

Background:

• Immunoassay techniques require sensitive detection methods for specific biomarkers.
• Near-infrared (near-IR) polymethine cyanine dyes offer unique spectral properties for labeling biomolecules.
• Existing detection methods may lack the sensitivity for picomolar-level measurements.

Purpose of the Study:

• To describe the construction and characterization of a novel near-infrared fluorescence detector.
• To enable the measurement of picomolar concentrations of near-IR laser dyes.
• To facilitate the application of near-IR dye-labeled antibodies in immunoassay development.

Main Methods:

• Construction of a fluorescence detector optimized for the near-IR spectrum (650-1100 nm).
• Characterization of the detector's hardware and data acquisition software.
• Testing the detector's performance in both solution-phase and solid-phase immunoassay formats.

Main Results:

• The detector successfully measures fluorescence from near-IR laser dyes at picomolar levels.
• Characterization data confirms the performance and reliability of the instrumentation.
• The detector demonstrates capability for both solution and solid-phase measurements.

Conclusions:

• A sensitive near-IR fluorescence detector has been developed for immunoassay applications.
• The detector enables precise quantification of near-IR dye-labeled antibodies.
• This instrumentation advances the potential for high-sensitivity biomarker detection using near-IR fluorescence.