Vector Labs is closed to observe Independence Day (US Holiday) on Thursday, July 4th.
We will be back in the office on Friday. We will respond to emails upon our return. Have a wonderful day.

m-dPEG®₁₂-TFP ester (QBD-10306)



m-dPEG®12-TFP ester, product number QBD-10306, is a medium-length (38 atoms, 44.0 Å), methyl-terminated, discrete-length polyethylene glycol (dPEG®) spacer. With a reactive end of 2,3,5,6-tetrafluorophenyl (TFP) ester, m-dPEG®12-TFP ester is designed to modify surfaces having accessible free amines.

Free amines react optimally with TFP esters in aqueous media at pH 7.5 – 8.0. TFP esters are more hydrolytically stable in water and aqueous buffers than NHS esters. Nevertheless, in aqueous media, the rate at which the ester hydrolyzes to the carboxylic acid increases as the pH increases. Moreover, it should be noted that reacting surface amines on biomolecules (e.g., proteins and peptides) with this uncharged, methyl-capped dPEG® spacer may alter the overall charge of the resulting conjugates.

There are numerous applications that could successfully employ m-dPEG®12-TFP ester, including the following:
vaccine development;
cell surface engineering;
imaging applications to reduce background and non-specific interactions;
construction of dendrimers;
coating of nanoparticles, quantum dots, and carbon nanotubes;
improving PK and BD of biomolecules; and,
preventing enzyme aggregation.


Unit Size100 mg, 1000 mg
Molecular Weight736.75; single compound
Chemical formulaC₃₂H₅₂F₄O₁₄
Purity> 98%
SpacersdPEG® Spacer is 38 atoms and 44.0 Å
Typical solubility properties (for additional information contact Customer Support)Methylene chloride, Acetonitrile, DMAC or DMSO.
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, 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.

How do I Request a Quote?

To request a quote for products:

  1.  Sign in to
  2.  Add the items you wish to quote to the cart;
  3.  View your cart;
  4.  Click on the “Request a Quote” button found below the items in your cart;
  5.  Download your quote