Shanghai VKEY Biotechnologies Co.,Ltd.
Shanghai VKEY Biotechnologies Co.,Ltd.
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TR FRET Assay Kit

VKEY-BIO's TR-FRET assay kits utilize advanced time resolved fluorescence resonance energy transfer (TR-FRET) technology, delivering rapid, wash-free operation with exceptional sensitivity, low background, and outstanding stability. These ready-to-use kits are optimized for diverse applications including protein-protein interaction studies, biomarker detection (cytokines/cAMP), phosphoprotein analysis, hybridoma screening, and antibody quantification.

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KeyTec® TR-FRET mAb anti-HIS-Solar Eu (100X)
KeyTec® TR-FRET mAb anti-HIS-Solar Eu (100X)

KeyTec® TR-FRET mAb anti-HIS-Solar Eu is designed for developing the TR-FRET Assay. The anti-HIS antibody is a mouse monoclonal antibody. In the Protein-Protein Interaction assay, one HIS-tagged protein binds to the donor (KeyTec® TR-FRET mAb anti-HIS-Solar Eu*1), and the other protein is labeled (directly or indirectly) with the acceptor (KeyTec® TR-FRET LA/HX*2). When the two proteins interact, the donor molecule is brought into proximity with the acceptor molecule. Excitation of the donor will result in the generation of the TR-FRET signal at 665 nm, proportional to the extent of protein interaction.

CAT. / A1020001S / A1020001L
KeyTec® TR-FRET Hybridoma screening kit (His antigen, Mouse IgG)
KeyTec® TR-FRET Hybridoma screening kit (His antigen, Mouse IgG)
The KeyTec® TR-FRET Hybridoma screening kit (His antigen, Mouse IgG) is designed for the simple and rapid screening of positive mouse hybridoma clones based on antigen-antibody affinity in cell supernatant. It is based on sandwich immunoassay model and utilizes TR-FRET technology, known for its ease of use, homogeneity (no wash), low background, high sensitivity, robustness.
CAT. / A1040003S / A1040003L
KeyTec® TR-FRET GDP loaded KRAS[G12D]/SOS1 Binding Assay kit
KeyTec® TR-FRET GDP loaded KRAS[G12D]/SOS1 Binding Assay kit

The KeyTec® TR-FRET GDP loaded KRAS[G12D]/SOS1 Binding Assay kit is designed for measurement of the interaction between KRAS[G12D] and SOS1 proteins. It is based on sandwich immunoassay model and utilizes TR-FRET technology, known for its ease of use, homogeneity (no wash), low background, high sensitivity, high accuracy.

CAT. / A1090001S / A1090001L
KeyTec® TR-FRET Revamped TKs kinase kit
KeyTec® TR-FRET Revamped TKs kinase kit

The KeyTec® TR‑FRET Revamped TKs Kinase Assay Kit quantifies tyrosine kinase activity using a universal substrate or customized tyrosine‑specific substrates, compatible with >60 TKs. It employs a biotinylated peptide and streptavidin‑HX, along with a Solar Eu‑labeled anti‑phospho‑Tyr antibody, in a TR‑FRET sandwich format. The assay involves kinase reaction and detection steps, producing a signal proportional to phosphorylation. Simple, rapid, sensitive, and reproducible.

CAT. / A1080023S / A1080023L / A1080023B
KeyTec® cAMP TR-FRET KIT
KeyTec® cAMP TR-FRET KIT

KeyTec® cAMP TR-FRET kit can be used to measure cAMP levels in cells. This kit is a competitive immunoassay developed using KeyTec® TR-FRET technology, featuring simple and rapid operation, high specificity, high sensitivity, and excellent reproducibility.

CAT. / A010101 / A010012 / A010014
KeyTec® TR-FRET Human IL2 Detection kit
KeyTec® TR-FRET Human IL2 Detection kit

KeyTec® TR-FRET Human IL2 Detection Kit is designed for the quantitative determination of Human IL2 in supernatants. This assay is based on a sandwich immunoassay method using KeyTec® TR-FRET technology, offering a simple, rapid, highly specific and sensitive, as well as reproducible detection process.


CAT. / A1070002D / A1070002S / A1070002L
KeyTec® TR-FRET Human IL1β Detection kit
KeyTec® TR-FRET Human IL1β Detection kit

KeyTec® TR-FRET Human IL1β Detection Kit is designed for the quantitative determination of Human IL1β in supernatants. This assay is based on a sandwich immunoassay method using KeyTec® TR-FRET technology, offering a simple, rapid, highly specific and sensitive, as well as reproducible detection process.


CAT. / A1070008D / A1070008S / A1070008L
KeyTec® TR-FRET Human IFNγ Detection kit
KeyTec® TR-FRET Human IFNγ Detection kit

KeyTec® TR-FRET Human IFNγ Detection Kit is designed for the quantitative determination of Human IFNγ in supernatants. This assay is based on a sandwich immunoassay method using KeyTec® TR-FRET technology, offering a simple, rapid, highly specific and sensitive, as well as reproducible detection process.


CAT. / A1070012D / A1070012S / A1070012L
KeyTec® TR-FRET  Human IL17F / IL17RA binding kit
KeyTec® TR-FRET Human IL17F / IL17RA binding kit

This kit utilizes KeyTec® TR-FRET technology for high‑throughput screening, enabling accurate measurement of IL17F/IL17RA protein‑protein interactions and assessment of the activities of small‑molecule inhibitors, peptides, and antibody‑blocking agents.

CAT. / A1070101S / A1070101L
KeyTec® TR-FRET  Human IL17A / IL17RA binding kit
KeyTec® TR-FRET Human IL17A / IL17RA binding kit

This kit utilizes KeyTec® TR-FRET technology for high‑throughput screening, enabling accurate measurement of IL17A/IL17RA protein‑protein interactions and assessment of the activities of small‑molecule inhibitors, peptides, and antibody‑blocking agents.

CAT. / A1070102S / A1070102L
KeyTec® TR-FRET GDP loaded KRAS[G12D]/RAF1 Binding Assay kit
KeyTec® TR-FRET GDP loaded KRAS[G12D]/RAF1 Binding Assay kit
The KeyTec® TR-FRET GDP loaded KRAS[G12D]/RAF1 Binding Assay kit is designed for measurement of the interaction between KRAS[G12D] and RAF1 proteins. It is based on sandwich immunoassay model and utilizes TR-FRET technology, known for its ease of use, homogeneity (no wash), low background, high sensitivity, high accuracy.
CAT. / A1090002S / A1090002L
KeyTec® TR-FRET cAMP HiRange Detection kit
KeyTec® TR-FRET cAMP HiRange Detection kit

KeyTec® TR-FRET cAMP HiRange Detection kit can be used to measure cAMP levels in cells. This kit is a competitive immunoassay developed using KeyTec® TR-FRET technology, featuring simple and rapid operation, high specificity, high sensitivity, and excellent reproducibility.

CAT. / A1030003S / A1030003L / A1030003B
KeyTec® TR-FRET mAb anti-HIS-Solar Tb (100X)
KeyTec® TR-FRET mAb anti-HIS-Solar Tb (100X)

KeyTec® TR-FRET mAb anti-HIS-Solar Tb is designed for developing the TR-FRET Assay. The anti-HIS antibody is a mouse monoclonal antibody. In the Protein-Protein Interaction assay, one HIS-tagged protein binds to the donor (KeyTec® TR-FRET mAb anti-HIS-Solar Tb*1), and the other protein is labeled (directly or indirectly) with the acceptor (KeyTec® TR-FRET LA/HX/Green*2). When the two proteins interact, the donor molecule is brought into proximity with the acceptor molecule. Excitation of the donor will result in the generation of the TR-FRET signal at 665 nm or 520 nm, proportional to the extent of protein interaction.

CAT. / A1020002S / A1020002L
KeyTec® TR-FRET PD1/PD-L1 Binding Assay kit
KeyTec® TR-FRET PD1/PD-L1 Binding Assay kit

KeyTec® TR-FRET PD1/PD-L1 Binding Assay Kit is designed for the quantitative measurement of the interaction between human PD1 and PD-L1 proteins. This kit provides a Tag1-PD-L1 protein, a Tag2-PD1 protein, an anti-tag1 antibody labeled with KeyTec® TR-FRET Solar Eu* 1 (mAb anti-Tag1 - Solar Eu) ,an anti-tag2 antibody labeled with KeyTec® TR-FRET LA* 2 (mAb anti-Tag2 - LA) and other detection reagents. These components enable the high-throughput screening of small molecule inhibitors, peptides, or antibody blockers.


CAT. / A1090003S / A1090003L
KeyTec® TR-FRET cAMP Higher Range Detection kit
KeyTec® TR-FRET cAMP Higher Range Detection kit

KeyTec® TR-FRET cAMP Higher Detection kit can be used to measure cAMP levels in cells. This kit is a competitive immunoassay developed using KeyTec® TR-FRET technology, featuring simple and rapid operation, high specificity, high sensitivity, and excellent reproducibility.

CAT. / A1030004S / A1030004L / A1030004B
KeyTec® TR-FRET STK discovery kinase kit
KeyTec® TR-FRET STK discovery kinase kit

This kit measures serine/threonine kinase (STK) activity, validated for over 150 STKs. It supplies three biotinylated substrates (S1/S2/S3), streptavidin‑HX, and a phospho‑STK antibody labeled with Solar Eu, enabling quantification via phosphorylated substrate detection.

CAT. / A1080002S
TR-FRET Assay Working Principle

TR-FRET Assay Working Principle

Time-Resolved Fluorescence Resonance Energy Transfer (TR-FRET) technology combines the advantages of Time-Resolved Fluorescence (TRF) and Fluorescence Resonance Energy Transfer (FRET). Based on the TR-FRET principle, this method utilizes the long fluorescence lifetime and high stability of lanthanide elements to deliver superior performance. Our TR-FRET assay kits provide an easy-to-use, homogeneous experimental approach that eliminates the need for washing. The Time Resolved Fluorescence Energy Transfer technology ensures enhanced stability, lower background, improved signal-to-noise ratio, and greater sensitivity, making it an ideal solution for robust detection.

Advantages of VKEY-BIO's TR-FRET Assay Kits

Easy to Use
Easy to Use

TR-FRET assay kits eliminate complex wash steps, simplifying protocol while delivering lab-ready consistency.

Good Specificity and High Sensitivity
Good Specificity and High Sensitivity

The TR-FRET assay kits deliver exceptional specificity and sensitivity, enabling reliable detection of low-abundance targets.

Suitable for High Throughput Screening
Suitable for High Throughput Screening

Designed for efficiency, our TR-FRET assay kits are optimized for high-throughput screening in 384-well formats.

Good Stability and Repeatability
Good Stability and Repeatability

VKEY-BIO's TR-FRET assay kits demonstrate outstanding batch-to-batch stability and experimental repeatability for consistent results.