Propargyl-PEG2-N-bis(PEG2) | CAS 2100306-62-3

Propargyl-PEG2-N-bis(PEG2) is a PEG-based propargylated click chemistry reagent featuring an alkyne handle for copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) and highly water-compatible PEG segments that support solubility and bioconjugation-friendly architectures. Its flexible, ether-rich structure is commonly leveraged to introduce clickable functionality into PEGylated biomaterials, coatings, and probe platforms where steric accessibility and aqueous handling are important. The reagent’s design aligns with downstream workflows in chemical biology and molecular imaging that require modular attachment to azide-bearing partners while maintaining a hydrophilic, nonfouling-like environment.

1. PEGylated Probe Functionalization

Propargyl-PEG2-N-bis(PEG2) is frequently used to install a terminal alkyne handle onto PEG-rich probe scaffolds for subsequent CuAAC coupling to azide-functional dyes, affinity tags, or imaging reporters. Researchers in chemical biology and molecular imaging value the reagent’s PEG architecture because it helps preserve solubility and reduces aggregation during labeling and purification steps, which is especially helpful when building multicomponent probe conjugates. The bis(PEG2) motif supports constructing well-defined, hydrophilic conjugation sites that can be incorporated into assay-ready reagent libraries.

2. Bioconjugation Linker Design

Propargyl-PEG2-N-bis(PEG2) serves as a click-compatible PEG linker for constructing modular bioconjugates, including PEGylated surfaces and macromolecular conjugates that require controlled spacing between reactive components. In bioconjugation workflows, the propargyl group provides a robust handle for CuAAC with azide-bearing biomolecules or targeting ligands, while the PEG segments promote compatibility with aqueous buffers and reduce nonspecific interactions during conjugation and downstream handling. This makes the reagent a practical choice for assembling research-grade conjugates used in labeling, pull-down compatible constructs, and multivalent binding toolkits.

3. Hydrogel and Surface Coating Chemistry

Propargyl-PEG2-N-bis(PEG2) is widely applied to functionalize polymeric materials and hydrogel networks where clickable PEG linkers are needed to immobilize biomolecules, create patterned binding sites, or incorporate fluorescent/affinity readouts. The reagent’s PEG-rich character supports uniform incorporation into hydrophilic matrices and helps maintain accessible alkyne functionality for efficient CuAAC attachment to azide-functional components. Materials scientists and biomaterials teams often use this type of PEG-propargyl linker to tune surface chemistry and to generate reproducible, water-compatible functional coatings for analytical and research instrumentation.

4. Molecular Imaging Probe Assembly

Propargyl-PEG2-N-bis(PEG2) is used in molecular imaging and diagnostic reagent development to assemble imaging probe conjugates through CuAAC coupling to azide-bearing reporter moieties. The PEG2–bis(PEG2) framework contributes to aqueous compatibility and helps manage probe behavior during conjugation, purification, and formulation into multicomponent imaging reagents. By providing a flexible, hydrophilic spacing element around the clickable alkyne, the reagent supports the construction of probe platforms where modular attachment and consistent physicochemical properties are key for reliable labeling workflows.