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DOTA-tris(acid)-amido-dPEG®₄-TFP ester (QBD-11160)



DOTA-tris(acid)-amido-dPEG®4-TFP ester, product number QBD-11160, contains a DOTA-tris(acid) group conjugated to a short (16 atoms, 17.9 Å), discrete polyethylene glycol (dPEG®) spacer and functionalized with 2,3,5,6-tetrafluorophenyl (TFP) ester. The TFP ester reacts specifically and efficiently with amines at an optimal pH range of 7.5 – 8.0. The macrocycle 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) is a popular, effective bifunctional chelator of trivalent lanthanide and yttrium radioisotopes. It is used in radiopharmacy for imaging, diagnostic, and therapeutic applications.

The short, amphiphilic, flexible dPEG® linker between the DOTA and the TFP ester moieties increases the hydrodynamic volume and water solubility of conjugate molecules. The increased hydrodynamic volume can reduce a conjugate molecule’s renal clearance, thereby increasing serum half-life and reducing the dosage of the conjugate required for efficacy. Moreover, dPEG® is non-immunogenic, and the increased hydrodynamic volume helps reduce the immunogenicity of conjugated molecules.


Unit Size100 mg, 500 mg, 1000mg
Molecular Weight1027.808; single compound
Chemical formulaC₄₁H₅₁F₁₀N₅O₁₇
Purity> 95%
SpacersdPEG® Spacer is 16 atoms and 17.9 Å
Typical solubility properties (for additional information contact Customer Support)Methylene Chloride, Acetonitrile, DMSO or DMAC.
Storage and handling-20°C; Always let come to room temperature before opening; be careful to limit exposure to moisture and restore under an inert atmosphere; stock solutions can be prepared with dry solvent and kept for several days (freeze when not in use). dPEG® pegylation compounds are generally hygroscopic and should be treated as such. This will be less noticeable with liquids, but the solids will become tacky and difficult to manipulate, if care is not taken to minimize air exposure.


Greg T. Hermanson, Bioconjugate Techniques, 2nd Edition, Elsevier Inc., Burlington, MA 01803, April, 2008 (ISBN-13: 978-0-12-370501-3; ISBN-10: 0-12-370501-0). Specifically see pp. 726-729 in his Chapter 18 on discrete PEG compounds for pegylation applications.

Greg T. Hermanson, Bioconjugate Techniques, 3rd Edition, Elsevier, Waltham, MA 02451, 2013, ISBN 978-0-12-382239-0; See chapter 18, Discrete PEG Reagents, pp.787-821, for a full overview of the dPEG® products.

Applicable patents and legal notices are available at legal notices.

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