mPEG6-azide | CAS 1043884-49-6

mPEG6-azide is a methoxy-terminated polyethylene glycol (mPEG) bearing a terminal azide, designed for bioorthogonal click chemistry workflows. As a small, well-defined PEG-azide handle, it is commonly used as an azide partner in strain-promoted or copper-catalyzed azide–alkyne cycloaddition strategies to introduce PEG functionality onto biomolecules, surfaces, and materials. Its PEG spacer and azide end-group combination makes it particularly relevant for solubility tuning, steric shielding, and modular conjugation in chemical biology, biomaterials, and molecular imaging reagent development.

1. Protein PEGylation Handles

mPEG6-azide is widely used to install short PEG chains onto proteins and peptide scaffolds via click-based conjugation, enabling controlled modification of solubility and surface properties for downstream assay development. Researchers often select this reagent when they need a compact PEG length that can be appended without introducing large steric barriers, supporting workflows for preparing PEGylated protein standards, imaging probes, and affinity reagents. The azide terminus provides a convenient, orthogonal chemical handle for coupling to complementary alkyne-bearing partners under bioorthogonal conditions used in chemical biology laboratories.

2. Surface And Material Functionalization

mPEG6-azide is applicable to the functionalization of polymeric and inorganic surfaces where PEG-like antifouling and interface tuning are required for robust reagent performance. In biomaterials and diagnostic reagent development, the azide functionality enables modular attachment of PEG spacers to alkyne-functionalized coatings, microarrays, and device surfaces, helping to reduce nonspecific adsorption and improve reproducibility of surface-bound assays. This reagent is commonly incorporated into platform materials used for immobilizing capture ligands, building responsive interfaces, and preparing low-background assay surfaces.

3. Molecular Imaging Probe Engineering

mPEG6-azide supports the construction of PEG-modified imaging and labeling reagents by providing a clickable PEG handle that can be appended to imaging moieties, targeting vectors, or scaffold components. In molecular imaging and chemical biology tool development, the PEG spacer can be used to tune probe hydrophilicity and circulation-like behavior proxies in preclinical reagent characterization workflows, while the azide enables efficient conjugation to alkyne-bearing imaging tags. Teams developing fluorescent, luminescent, or radiolabel-adjacent probe libraries frequently use mPEG6-azide to standardize physicochemical properties across probe variants.

4. Drug Discovery Tool Conjugates

mPEG6-azide is frequently employed in medicinal chemistry and chemical biology as a PEGylation reagent for generating clickable linker systems and PEG-tagged molecular probes used in target engagement and binding studies. The reagent’s azide end-group allows researchers to attach PEG spacers to alkyne-functional ligands, building blocks, and reporter conjugates used in screening-adjacent workflows and mechanistic assays. Its compact PEG format is particularly useful when developers want to modulate solubility and reduce aggregation tendencies while maintaining a modular chemistry strategy for rapid analog synthesis and reagent library expansion.