m-dPEG®₈-NHS ester




m-dPEG®8-NHS ester, product number 10260, is a medium length, methyl-terminated, discrete length polyethylene glycol (dPEG®) spacer. With a reactive end as the N-hydroxysuccinimidyl (NHS) ester, m-dPEG®8-NHS ester is designed to modify surfaces containing accessible free amines. NHS reacts optimally with free amines at pH 7.2 – 7.5. The hydrolytic rate of the ester to the carboxylic acid increases with increasing pH. Please note that modification of 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.

Many applications employ this m-dPEG®8-NHS ester. Published papers using this product include:

  • imaging applications;
  • design of a delivery mechanism for an anti-HIV therapeutic peptide;
  • coating of carbon nanotubes, gold nanoshells, and silica shelled quantum dots;
  • PK improvement of organophosphorus hydrolase in a therapeutic application;
  • peptide synthesis; and,
  • development of antibacterial, cytotoxic dendrimers.

m-dPEG®8-NHS ester, product number 10260, is just one member of an comprehensive line of methyl-terminated dPEG® products. This line includes dPEG® spacers containing 2 to 49 ethylene glycol units. These products are functionalized with NHS or with 2,3,5,6-tetrafluorophenol (TFP). TFP has proven to be superior to NHS for amine-reactive products. For more information on the superior performance of TFP esters, please see our page TFP Esters Have More Hydrolytic Stability and Greater Reactivity than NHS Esters.

Quanta BioDesign, Ltd., makes and sells single molecular weight PEG linkers and spacers with discrete chain lengths under the trade name dPEG®. Our products are distinctly different from traditional PEG products in that they are not disperse polymers. However, they confer all of the benefits of traditional PEG products. To learn more about dPEG® products, please read our page What is dPEG®? Please also visit our Frequently Asked Questions page to get answers to the questions we answer most often.




Additional information

Weight .5 oz
Dimensions .75 × .75 × 2 in

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