SPDP-dPEG®₂₄-NHS ester

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SPDP-dPEG®24-NHS ester, product number 10379, is an amphiphilic, water-soluble, monodispersed PEGylation reagent that is designed to crosslink amines and free thiols. SPDP (sometimes referred to as orthopyridyl disulfide, or OPSS, in the scientific literature) reacts with sulfhydryl groups to form disulfide bonds. The N-hydroxysuccinimide (NHS) ester reacts with free amines to form amide bonds. The single molecular weight, discrete chain length polyethylene glycol (dPEG®) chain is 80 atoms (97.3 Å) long.

PEGylation with Quanta BioDesign’s dPEG® Products

Quanta BioDesign’s single molecular weight, discrete chain length PEGylation reagents are quite different from traditional PEGylation reagents. Our products are not dispersed polymers, nor are they purified from polymeric mixtures. Instead, we synthesize all of our products from high-purity starting materials and maintain discrete chain lengths and single molecular weights throughout the entire synthetic process. To learn more about our products and technology, please visit our informational pages linked below.

What is dPEG®?

Frequently Asked Questions (about dPEG® products)

Crosslinking with SPDP

Among the most popular heterobifunctional crosslinking reagents used in bioconjugate chemistry are those compounds that conjugate molecules containing free amine groups with molecules that contain sulfhydryl groups. SPDP (N-succinimidyl 3-(2-pyridyldithio)-propionate, also called OPSS) is one of the most popular versions of this type of crosslinker. Unfortunately, SPDP and its popular varieties (LC-SPDP and Sulfo-LC-SPDP) are hydrophobic molecules. When conjugated to biomolecules, care must be taken not to modify the target molecules too much, because this can precipitate the conjugate products.

Using SPDP-dPEG®24-NHS ester

SPDP-dPEG®24-NHS ester, product number 10379, is used like SPDP and its related hydrophobic products. However, precautions against overly modifying the target molecule are not necessary. This water-soluble dPEG® product prevents precipitation of conjugates due to excessive hydrophobicity. Greg Hermanson’s Bioconjugate Techniques, 3rd edition, describes SPDP and related products (Chapter 6) and describes Quanta BioDesign’s dPEG® versions of these products (Chapter 18). Each of the chapters describing these crosslinkers contains detailed protocols for using them. Quanta BioDesign highly recommends and sells this book. Click here for a review and to purchase Bioconjugate Techniques, 3rd edition.

Bulk Scale Production is Available

If you need bulk product in a larger package size than our standard sizes, please contact us for a quote. Our commercial capabilities permit us to manufacture this product at any scale that you need.

Buy Now!

If you need to conjugate amine and sulfhydryl groups, stop using inferior hydrophobic SPDP products. Click on the “Add to Cart” button today and start using our superior, water-soluble SPDP-dPEG®24-NHS ester product. You, too, can experience “the dPEG® difference” that thousands of other satisfied customers have enjoyed.

Additional information

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