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Enzyme immunometric assay for L-thyroxine using direct ultraviolet irradiation
E Etienne1, C Créminon, P Lamourette
1CEA, Service de Pharmacologie et d'Immunologie, Département de Recherche en Imagerie, Pharmacologie et Physiologie, Gif sur Yvette, France.
Analytical Biochemistry
|February 10, 1995
Summary
A novel enzyme immunoassay for L-thyroxine (T4) detection in plasma utilizes UV irradiation for covalent cross-linking. This method offers high specificity and good correlation with radioimmunoassay, providing a reliable diagnostic tool.
Area of Science:
- Biochemistry
- Immunology
- Analytical Chemistry
Background:
- Accurate measurement of L-thyroxine (T4) is crucial for diagnosing thyroid disorders.
- Existing immunoassays may have limitations in specificity or require radioactive materials.
Purpose of the Study:
- To develop and validate a new enzyme immunometric assay for quantifying L-thyroxine in human plasma.
- To utilize UV irradiation as an efficient cross-linking method for immunoassay development.
Main Methods:
- An enzyme immunometric assay was designed using monoclonal anti-L-thyroxine antibodies.
- L-thyroxine in plasma was immunocaptured and then covalently linked via UV irradiation and methanol treatment.
- Acetylcholinesterase-labeled antibody was used for detection of the covalently bound L-thyroxine.
Main Results:
- The assay demonstrated a minimal detectable concentration of 4.8 nmol/liter.
- A coefficient of variation below 16% was achieved within the 20-320 nmol/liter range.
- High specificity was observed, with excellent correlation (r = 0.959) against a commercial radioimmunoassay in 33 human plasma samples.
Conclusions:
- The developed enzyme immunometric assay is a sensitive, specific, and reliable method for L-thyroxine measurement.
- UV cross-linking offers a non-radioactive and effective approach for T4 immunoassay development.
- This assay presents a viable alternative to radioimmunoassays for clinical diagnostics.