Propargyl-PEG10-amine | CAS 2112737-25-2

Propargyl-PEG10-amine is a PEG-based primary amine bearing a terminal alkyne, designed for copper-free or copper-assisted click chemistry workflows that enable efficient bioorthogonal conjugation. As a bifunctional linker, it combines the reactivity of a propargyl group with the solubility and spacing benefits of a PEG10 chain, making it a common building block for attaching biomolecules, polymers, and surfaces to azide-functional partners. Its amine handle also supports pre-functionalization strategies, including coupling to activated carboxylates or incorporation into larger conjugation schemes used in chemical biology, imaging, and materials research.

1. Bioorthogonal Probe Conjugation

Propargyl-PEG10-amine is widely used to install a clickable alkyne on proteins, peptides, antibodies fragments, and affinity reagents prior to reaction with azide-bearing labels. The PEG10 spacer helps reduce steric congestion and improves conjugate handling in aqueous buffers, which is particularly valuable when preparing fluorescent, affinity, or activity-based probes for target engagement studies. Researchers commonly use Propargyl-PEG10-amine as a modular intermediate to generate alkyne-functional biomolecular reagents that can be rapidly combined with azide dyes, azide oligonucleotides, or azide-tagged affinity handles to streamline probe library construction.

2. Surface and Material Functionalization

Propargyl-PEG10-amine supports the creation of click-ready coatings and functional interfaces by introducing terminal alkyne groups onto polymer films, hydrogel matrices, and solid supports. The PEG chain improves wettability and reduces nonspecific adsorption, which is advantageous for surface-based assays and for constructing patterned materials where subsequent azide–alkyne coupling is used to immobilize ligands, capture reagents, or imaging tags. In biomaterials workflows, Propargyl-PEG10-amine is frequently incorporated into surface modification chemistries to produce stable, addressable platforms compatible with downstream conjugation to azide-functional components.

3. PEG Linker for Bioconjugates

Propargyl-PEG10-amine is used as a flexible PEG linker to tune spacing and solubility in multicomponent bioconjugates, including enzyme conjugates, polymer–biomolecule hybrids, and reagent constructs that require controlled distance between functional groups. The terminal alkyne provides a standardized click handle, while the primary amine enables orthogonal coupling to activated scaffolds or carrier molecules before the final click step. This approach is common in chemical biology reagent development where modularity and reproducibility are essential for building families of conjugates with consistent linker architecture.

4. Molecular Imaging Reagent Building

Propargyl-PEG10-amine is a practical reagent for constructing imaging and detection probes that require late-stage attachment of reporter groups via azide–alkyne coupling. By providing an alkyne-functional PEG spacer, it helps maintain favorable probe solubility and reduces aggregation, supporting robust labeling in complex labeling buffers used for microscopy, flow-based detection, and imaging reagent preparation. Many imaging workflows rely on Propargyl-PEG10-amine to generate alkyne-bearing precursor conjugates that can be combined with azide-functional fluorophores or other signal reporters, enabling rapid swapping of reporter components during assay optimization.