The Cbz protecting group (also called the Z protecting group) is one of the most popular protecting groups for amines. It is stable to base and mildly acidic conditions. Cbz can be cleaved by a variety of methods. The most popular cleavage method is hydrogenolysis, using palladium black or palladium on carbon.
PEGylation with dPEG® Products
PEGylation refers to the covalent addition of polyethylene glycol (PEG) to a compound or surface. PEGylated compounds include proteins, peptides, dyes or other labels, and small molecule drugs. Peptide synthesis frequently employs PEGylation to enhance a peptide’s solubility in water. Moreover, peptide PEGylation prolongs in vivo circulation of peptide conjugates by both increasing the peptide’s hydrodynamic volume and protecting the peptide from proteolysis. Additionally, PEGylation reduces or eliminates antigenicity of the conjugated peptide.
Quanta BioDesign’s single molecular weight PEG products (known as “discrete PEG” and sold under the dPEG® trademark) provide all of the benefits of traditional, dispersed PEG without the analytical headache that comes from having an intractable mixture of conjugates, each with different PEG chain lengths.
CBZ-N-amido-dPEG®24-acid works well in peptide synthesis with solution-phase chemistry. Other synthetic processes (e.g., surface modification, supramolecular construction) requiring the attachment or insertion of a long PEG linker or spacer also can employ this product profitably.
CBZ-N-amido-dPEG®24-acid is activated using carbodiimide chemistry, with or without an acylating agent such as N-hydroxysuccinimide or 2,3,5,6-tetrafluorophenol. The activated acid or active ester then reacts with free amines to form amide bonds. Hydrogenolysis of the conjugate cleaves the Cbz group from the molecule and exposes the terminal amine so that it is available for additional reactions as needed.
PN10316 is one product in a line of similar products. We invite you to consider our entire range of Cbz-protected amino-dPEG®x-acid products whenever you need a single molecular weight PEG for your product.
Bulk Quantities Are 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.
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