Propargyl-PEG10-acid | CAS 2055022-18-7

Propargyl-PEG10-acid is a PEG-based propargyl functionalized linker designed for copper-free or copper-mediated click chemistry workflows, commonly used as a terminal alkyne handle for bioorthogonal conjugation. Its ether-rich PEG spacer and carboxylic acid functionality support aqueous compatibility and downstream coupling to amines, hydrazides, or activated surfaces, enabling robust attachment of biomolecules, nanoparticles, and polymeric materials. As a versatile click reagent, Propargyl-PEG10-acid is frequently selected to introduce an alkyne tag that can be subsequently reacted with azide-bearing partners in molecular imaging, diagnostic reagent development, and biomaterials functionalization.

1. Bioorthogonal Probe Conjugation

Propargyl-PEG10-acid is widely used to install an alkyne functionality on peptides, proteins, antibodies, and targeting ligands through carboxyl-enabled coupling chemistries, providing a PEG-mediated distance that can reduce steric hindrance during subsequent azide–alkyne click labeling. Researchers in chemical biology and molecular imaging rely on this reagent to generate click-ready probe conjugates for fluorescence, affinity-based detection, and secondary labeling workflows. The PEG spacer is particularly valuable when the probe must maintain solubility and accessibility in complex biological buffers, supporting consistent labeling of azide-functional reporters and imaging handles.

2. Surface and Nanoparticle Functionalization

Propargyl-PEG10-acid is commonly incorporated into surface modification strategies for gold nanoparticles, polymer nanoparticles, and functionalized beads where the carboxylic acid group enables attachment to pre-functionalized surfaces or coupling to reactive coatings. The resulting alkyne-functional materials can then be patterned or decorated with azide-bearing biomolecules, enabling modular construction of multivalent platforms for assay development and research tool generation. This approach is frequently adopted in materials science and industrial R&D settings to create stable, water-compatible clickable interfaces for downstream conjugation and immobilization of reagents.

3. Biomaterials PEG Linker Platforms

Propargyl-PEG10-acid is used as a PEG linker building block to introduce click-reactive alkyne sites into hydrogels, coatings, and polymer networks, supporting controlled incorporation of bioactive or affinity components via azide–alkyne conjugation. Biomaterials groups select this reagent when they need a flexible, hydrophilic spacer that can improve reagent diffusion and accessibility of reactive groups within porous or crosslinked matrices. By leveraging the terminal carboxylic acid for initial material integration, Propargyl-PEG10-acid enables reproducible fabrication of clickable biomaterial surfaces and constructs used in assay capture formats, research scaffolds, and functional material libraries.

4. Diagnostic Reagent Labeling

Propargyl-PEG10-acid is frequently employed to prepare alkyne-tagged components for diagnostic reagent development, including labeling of affinity reagents, assay standards, and multicomponent detection systems that use azide-functional reporter moieties. The PEG spacer helps maintain solubility and reduces non-specific interactions during reagent handling, which is important for consistent performance in analytical workflows that involve complex sample matrices. Teams developing research-grade diagnostic assays use Propargyl-PEG10-acid to streamline the assembly of modular detection reagents by enabling reliable click coupling to azide-bearing signal reporters and capture elements.