LCA | Perkin Elmer

Boost your biology projects with Cisbio solutions

We are assay designers

Like you, our valued clients and partners, we are scientists, and for over 30 years our expertise has been committed to the discovery of new high-end analytical methods and investigation means. Immunoassays, fluorescence, and biology are all in our DNA. Working side by side with you, we are able to create the tools that will deliver rapid and accurate results with total confidence.
In biology, like in scientific relationships, interaction is everything!

HTRF Assay Principle

HTRF (Homogeneous Time Resolved Fluorescence) is a no-wash technology. It combines standard FRET technology with time-resolved measurement of fluorescence, eliminating short-lived background fluorescence. For a sandwich assay, two antibodies that recognize a protein of interest are used, with one antibody coupled to a donor, and the other with the acceptor. If the 2 antibodies recognize the analyte, the donor will emit fluorescence upon excitation and the energy will be transferred to the nearby acceptor, giving specific acceptor fluorescence. The donor fluorescence is also measured and a ratio with the acceptor fluorescence is applied.

HTRF®: the gold reference for time-resolved FRET

HTRF is a FRET-based technology that emerged from the Jean-Marie Lehn’s Nobel prize-winning work on rare earth complexes. Due to the chemical and photophysical characteristics of these fluorescent dyes, HTRF exhibits performance levels in stability and specificity that make it unparalleled for time-resolved FRET studies. It is especially extremely stable in time, allowing repetitive measurements for days. The very structure of HTRF reagents also makes assays highly resistant to most experimental conditions, including additives, chelates, DMSO, ionic strength, challenging cations, pH, temperature, or cell culture media. See the reagent chemistry tab for more details about HTRF reagents.