The DELFIA labeling service provides custom labeling of biomolecules with the lanthanide chelates Europium (Eu), Samarium (Sm), Terbium (Tb) and Dysprosium (Dy) Proteins, peptides, oligonucleotides, DNA, and other small molecules can be labeled. Peptide labeling can also include synthesis of peptides of up to 40 amino acids. The labeled compounds have a high specific activity with minimal effect on biological activity as well as good stability.
These lanthanide chelates have unique fluorescence properties that serve well as sensitive labels in wide variety of applications. Detection levels can be as low as a few attomoles per well. In addition, compounds can be labeled with chelates for use in multiplexing assays. Europium gives high fluorescence and has the best sensitivity. Samarium and Terbium labels should be used as the second label in dual-label assays for measuring the analyte requiring the lower sensitivity.
A selection of buffers and other reagents and needed for setting up DELFIA assays are available as catalog items.
Europium (Eu), Samarium (Sm), Terbium (Tb) and Dysprosium (Dy) labeling of protein and peptides
This labeling service offers you the benefits of our extensive experience in the labeling of biomolecules with lanthanide chelates. Proteins can be conjugated with several chelates (5 - 20) without loss of affinity. We can synthesize a peptide of a specified sequence up to 40 amino acids long and label cysteine or lysine residues site specifically.
Examples of protein that have been labelled with DELFIA chelates include:
- Cytokines (IL-2, IL-4, TNFalpha)
- Chemokines (eotaxin)
- Receptors (insulin, IGF, TNFR)
Examples of peptides that have been labelled with DELFIA chelates include:
- Substance P
The labeled protein will be sent back to you within 2-3 days in the USA and within 2 weeks in Europe and Japan. Peptide synthesis and labeling is completed within 3-4 weeks.
Eu, Sm, Tb and Dy labeling of DNA oligonucleotides including synthesis
You specify the sequence and we synthesize and label your oligonucleotide. Short probes used in hybridization efficiency or melting temperature studies and primers for PCR are usually conjugated with one to three lanthanide chelates. Longer probes are labeled according to the requirements of the application, typically with 5-20 chelates.
The purified, labeled compound is delivered within 3 weeks of receiving your order. We can also provide you with biotinylated oligonucleotides and an assay optimization service.
Eu, Sm, Tb and Dy labeling of haptens
We also have extensive experience in the labeling and purification of small molecules such as
Our labeling services are performed at one of our Centers of Excellence in Boston, Turku, Montreal, or Akron. When you are ready to contact us, you can reach us in several ways:
To directly submit a quotation request you may email us with your inquiry. Alternatively, contact your local sales representative or Technology Manager, who will assist you with your request.
E-mail us at firstname.lastname@example.org.