Assay Technologies

Many of our Microplate Readers have received certifcation from reagent companies for their outstanding performance with various assay technologies. For more information about these certifications and assay technologies as well as which microplate readers can perform these assays, please click on the certifications below:


In addition we have also gathered information on the following assay technologies:


HTRF® - Homogenous Time-Resolved Fluorescence

HTRF HTRF® is a TR-FRET based technology from Cisbio Bioassays International. This technology uses the principles of both TRF and FRET. The HTRF® donor fluorophore is either Europium cryptate (Eu3+ cryptate) or Lumi4™-Tb (Tb2+ cryptate). (Lumi4™-Tb (Tb2+ cryptate) results from collaboration between Cisbio and Lumiphore Inc.)

Both donors have the long-lived emissions of lanthanides coupled with the stability of cryptate encapsulation. XL665, a modified allophycocyanin, is the HTRF® primary acceptor fluorophore. d2 represents a second generation of acceptor characterized by an organic structure 100 times smaller.

HTRF figureHTRF® is a highly flexible chemistry that measures biomolecular complexes of many different sizes. This includes assessment of small phosphorylated peptides, immunoassays for quantifying large glycoproteins, receptor tyrosine kinase activity using membrane preparations and indirect detection (via secondary antibodies) of tagged complexes such as CD28/CD86 binding (see figure to the left).

HTRF Products

The following BMG LABTECH microplate readers are certified HTRF®-compatible by Cisbio: HTRF measurements on the CLARIOstar microplate reader

HTRF Measurements

BMG LABTECH has published numerous Application Notes using HTRF® technology. This technology works well on many of our readers, including the CLARIOstar and PHERAstar FSX and Omega Series.

HTS Instrument Discovers Low Affinity Inhibitors of the Inositol Phosphate (IP) Signaling Pathway (AN 222)
Functional Screening of recombinant CHO-M1 cells using the PHERAstar from BMG LABTECH (AN 193)
HTRF IP-One Terbium-based assay performed on BMG LABTECH's PHERAstar Plus (AN 177)
Cisbio's HTRF cortisol assay performed on the PHERAstar (AN 154)

The fluorescence ratio associated with HTRF® readout is a correction method developed by Cisbio and covered by the US patent 5,527,684 and its foreign equivalents. The dual simultaneous fluorescence time-resolved measurement is covered by Cisbio's US patent 6,352,672 and its foreign equivalents. Cisbio has granted BMG LABTECH a license for the promotion of these methods with its microplate readers. The application of said methods is strictly limited to the use of HTRF® reagents and technology, excluding any and all other TR-FRET technologies.