Azido-PEG8-CH2COO-PFP | CAS 2182601-80-3

Azido-PEG8-CH2COO-PFP is a PEG-based azide functional reagent that combines a bioorthogonal azide handle with a PFP-activated ester for efficient coupling to primary amines. As a click chemistry reagent, it is designed for strain-promoted or copper-catalyzed azide-based conjugation workflows, enabling downstream attachment of targeting ligands, imaging tags, or polymeric components to biomolecules and surfaces. The PEG8 spacer and carboxymethyl linkage improve solubility and provide distance control, which is particularly valuable in bioconjugation and molecular imaging reagent development.

1. Protein Labeling Workflows

Azido-PEG8-CH2COO-PFP is used to introduce an azide-bearing PEG spacer onto proteins and peptide carriers through PFP-mediated acylation of accessible primary amines. This enables subsequent click-based attachment of fluorophores, affinity tags, or multivalent scaffolds while maintaining improved aqueous compatibility and reduced steric crowding compared with shorter linkers. Researchers commonly select this reagent when they need a stable, amine-reactive installation step followed by modular azide click coupling for probe assembly.

2. Surface And Material Functionalization

Azido-PEG8-CH2COO-PFP supports azide installation on amine-containing surfaces and biomaterials, including polymer films, bead surfaces, and functionalized coatings prepared for subsequent click conjugation. The PFP ester provides a practical route to covalently immobilize the PEG-azide motif, while the PEG8 chain helps preserve accessibility of the azide for later coupling steps. This approach is widely used in building blocks for diagnostic reagent platforms, affinity capture materials, and modular sensor surfaces where orthogonal attachment is required.

3. Imaging Probe And Reporter Assembly

Azido-PEG8-CH2COO-PFP is frequently incorporated into workflows that generate imaging-capable conjugates by first installing the azide handle onto a scaffold and then performing azide click coupling to append dyes, reporter groups, or imaging-compatible moieties. The PEG8 spacer can reduce non-specific interactions and improve the presentation of the reactive handle, which is advantageous when assembling multicomponent probes from separately optimized building blocks. Molecular imaging and chemical biology groups use this reagent to streamline probe construction with a consistent azide functional group across different carriers.

4. Multivalent Ligand Conjugation

Azido-PEG8-CH2COO-PFP is well suited for creating multivalent ligand constructs by coupling the azide-PEG motif to amine-bearing targeting or binding components, followed by click-based attachment of additional ligands or scaffold elements. The combination of an amine-reactive PFP ester and a terminal azide supports a two-stage strategy: functionalize the carrier with the PEG-azide unit, then build higher-order architectures through azide click chemistry. This is commonly applied in chemical biology tool development where controlled spacing and modularity are important for generating reproducible conjugate libraries.