Up to 1700x binding affinity enhancement over regular aptamers

Traditional aptamers use just four nucleotides: A, C, G, and T (in the case of DNA aptamers) and A, C, G, and U (in the case of RNA aptamers).

Raptamers™ go further. We generate next-generation aptamers with a backbone made up of standard DNA nucleotides, plus a number of amino acid side chains, through a series of custom modifications that are part of our proprietary process. The side chains give our Raptamers™ more diversity, stronger binding, and increase hydrophobicity, increasing both specificity and antibody-like behavior.

Finally, we have developed a large number of custom modifications that can push binding affinity even further, into the picomolar range!


KD determination for the binding of O.2.1 aptamer to mouse OPG in buffer by biolayer interferometry (Octet RED96, Forte Bio). Global fitting was performed assuming a 1:1 binding model. KD ~1 pM.  R2 0.99817

Plasmodium falciparum Dehydrogenase (PfLDH)

KD determination of PLDH binding to aptamers PLDH-M-86 and PLDH-M-106 using the ELONA assay as defined by nonlinear least square curve fitting in buffer conditions. Resulting KDs are 32 nM and 12 nM respectively.


Thrombin aptamer shows enhanced binding affinity when modified with indole or phenol.  Responses were normalized to the unmodified GA9A aptamer and fold enhancements at indicated positions with either indole or phenol modifications are shown in the above bar graph. KDs were determined based on a 1:1 binding model. T4 indole modified aptamer is 1.8 pM, T12 indole modified aptamer is 1.2 pM and T12 phenol modified aptamer is 264 pM.

Raptamer Discovery Group Aptamers Raptamers




4 Weeks from Target Receipt to Material Shipped


Higher Affinity Binding


Extensive Modifications Available

No PCR Bias

Raptamer Discovery Group’s mission is to help you find great binding molecules for your research or commercial application. Faster, stronger, better: the Raptamer™ way!

Let’s Discover a Raptamer™ Together!