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Related Experiment Video

Updated: Jun 28, 2026

Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

Published on: November 2, 2009

Fiber-Optic time-resolved fluorimetry for immunoassays.

R D Petrea¹, M J Sepaniak, T Vo-Dinh

¹Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600, U.S.A.

|February 1, 1988

Summary

Rare-earth metal chelates offer superior fluorescence detection in fiber-optic immunoassays. Time-resolved detection significantly lowers detection limits for enhanced assay sensitivity.

Area of Science:

Biochemistry
Analytical Chemistry
Optics

Background:

Rare-earth metal chelates exhibit long fluorescence lifetimes, enabling time-resolved detection.
Fiber-optic fluorimetry often suffers from high background noise due to back-scattered radiation.
Conventional fluorescent labels like fluorescein isothiocyanate have limitations in sensitivity.

Purpose of the Study:

To evaluate the utility of time-resolved fluorimetry using rare-earth metal chelates in fiber-optic immunoassays.
To demonstrate significantly improved detection limits compared to standard methods.

Main Methods:

Utilized europium chelate-labeled reagents for immunoassay development.
Covalently bonded rabbit immunoglobulin G (IgG) to quartz optical fibers.

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Employed time-resolved detection to minimize background noise from back-scattered radiation.

Main Results:

Achieved a detection limit of 10(-12)M for Eu 2-naphthoyltrifluoroacetonate using time-resolved detection.
Demonstrated a limit of detection of approximately 0.1 mug/ml for the fiber-optic immunoassay.
Showcased a nearly three-orders-of-magnitude improvement in detection limit compared to fluorescein isothiocyanate.

Conclusions:

Time-resolved detection with rare-earth metal chelates significantly enhances sensitivity in fiber-optic immunoassays.
This approach effectively overcomes background noise issues inherent in fiber-optic fluorimetry.
Europium chelates represent a promising advancement for sensitive biosensing applications.