Related Experiment Videos
Labeling of steroids on solid phase
Jari Peuralahti1, Katriina Suonpää, Kaj Blomberg
1PerkinElmer Life and Analytical Sciences, Turku Site, P.O. Box 10, FIN-20101, Finland.
Bioconjugate Chemistry
|July 22, 2004
Summary
Lanthanide(III) chelates were successfully conjugated to steroids for use in fluoroimmunoassays. Multilabeled steroid tracers enable higher serum dilution in immunoassays, useful when antiserum is limited.
Area of Science:
- Bioconjugation Chemistry
- Analytical Chemistry
- Biochemistry
Background:
- Steroid conjugates are vital in developing sensitive immunoassays.
- Lanthanide chelates offer unique luminescent properties for detection.
- Developing multivalent tracers can enhance assay performance.
Purpose of the Study:
- To synthesize and characterize novel steroid-europium(III) conjugates.
- To evaluate the utility of these multilabeled tracers in DELFIA-based fluoroimmunoassays.
- To assess the impact of multiple chelates on assay sensitivity and dilution factors.
Main Methods:
- Solid-phase synthesis of Fmoc glutamic acid derivatives.
- Attachment of chelates to steroid backbones (17alpha-hydroxyprogesterone and estriol derivative).
- Development and validation of DELFIA (Dissociation Enhanced Lanthanide FluoroImmunoAssay) competitive assays.
Main Results:
- Successful synthesis of steroid conjugates with up to four lanthanide chelates.
- Demonstrated that increased chelate conjugation on 17-alpha-hydroxyprogesterone allows higher antiserum dilution without affecting the measurement range.
- Validated the use of these multivalent tracers in competitive fluoroimmunoassays.
Conclusions:
- Lanthanide(III) chelates are suitable and effective as multilabels in bioaffinity assays.
- Multilabeled steroid tracers enhance assay performance, particularly in situations with limited antiserum.
- This approach offers a valuable strategy for optimizing immunoassay design and sensitivity.