d2 Labeling kit HTRF®

d2 labeling kit tailored for biomolecule labeling and straightforward development of time-resolved fluorescence resonance energy transfer assays.
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d2 labeling kit tailored for biomolecule labeling and straightforward development of time-resolved fluorescence resonance energy transfer assays.


The d2 labeling kit is suitable for quick, easy labeling of peptides, proteins, and oligonucleotides with d2.

This kit is designed for very small-volume fast labeling needs, such as determining the best antibody among several antibodies available for HTRF assay development.

The N-hydroxysuccinimide activated d2 supplied reacts with primary amines carried by the biomolecules to label, for simplified conjugation.

The kit includes all the materials necessary for the labeling procedure (except dialysis and concentration devices).



Assay principle

The labeling procedure is performed under very mild conditions. As shown here, the process comprises an incubation step with the dessicated dye, followed by purification on a disposable column. Both the purification column and the buffer for purifying the conjugate are included in the kit, as well as a calibrator to define the ideal working dilution of the labeled material in HTRF assays. Depending on the molecular weight of the target molecule and the nature of the dye, each kit enables the labeling of 5-25 µg (protein-MW 15 kDa) to 50-250 µg (antibody-MW 150 kDa).
assay principle of the labeling of a molecule using HTRF d2 Labeling kit

Assay protocol

The labeling procedure is described on the right. 100 µL of the targeted molecule (16.67 µM) in carbonate buffer pH 9.0 are added to the d2 vial. After an incubation of 45 minutes at RT, labeled protein is eluted on an equilibrated column. After having discarded 700 µL of elution buffer, the labeled molecule is collected in 400µL fraction.
assay protocol of the labeling of a molecule using HTRF d2 labeling kit

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Plate Reader Requirement

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