Azido-PEG6-amine | CAS 957486-82-7

Azido-PEG6-amine is a PEG-based azide functionalization reagent designed for copper-free and copper-mediated click chemistry workflows, enabling robust conjugation to complementary alkynes or cyclooctynes. Its six-ethylene glycol spacer provides aqueous solubility and spacing control, while the terminal amine supports downstream coupling to activated esters, aldehydes, isothiocyanates, or other electrophiles. This combination makes Azido-PEG6-amine a widely used building block for preparing click-reactive linkers, surface and material functionalization reagents, and modular probe scaffolds in chemical biology and biomaterials research.

1. Bioorthogonal Probe Linkers

Azido-PEG6-amine is commonly used to introduce a PEG spacer and an azide handle into fluorescent probes, affinity reagents, and activity-based sensing platforms that rely on click conjugation to alkyne-bearing partners. Researchers use the amine functionality to further tailor probe chemistry, such as adding solubilizing groups, attaching to carrier proteins, or preparing handle-equipped intermediates for multistep labeling strategies. The PEG6 segment helps reduce steric crowding during conjugation and improves compatibility with aqueous labeling conditions, which is particularly valuable when building modular probe sets for imaging and assay development.

2. Surface And Material Functionalization

Azido-PEG6-amine is used to functionalize polymeric and biomaterial surfaces with azide groups for subsequent attachment of bioactive ligands, capture molecules, or imaging tags via click coupling. In materials science workflows, the PEG spacer can improve presentation of the azide functionality away from the surface, supporting more efficient and reproducible downstream attachment of alkyne-functional components. The terminal amine also enables straightforward incorporation into surface chemistries that require amino-reactive intermediates, supporting the preparation of clickable coatings, membranes, and scaffold materials for research-grade assay platforms.

3. Protein And Peptide Conjugation

Azido-PEG6-amine serves as a versatile linker for preparing azide-functional protein and peptide conjugates used in chemical biology toolkits. The amine group provides a convenient point for coupling or for generating intermediates that can be incorporated into larger bioconjugates, while the azide moiety enables orthogonal attachment to alkyne-bearing reporters or targeting modules. This reagent is frequently selected when a PEG6 spacer is desired to moderate local charge and steric effects, improving conjugation consistency across different labeling formats and enabling systematic variation of linker length in probe libraries.

4. Diagnostic Reagent Building Blocks

Azido-PEG6-amine is applied as a click-compatible intermediate for constructing diagnostic and assay reagents that require modular assembly of recognition elements and signal-generating components. Teams developing multiplexed binding assays, affinity capture formats, and reagent panels often use the azide handle for reliable attachment to complementary click partners, while the amine group supports integration into standardized reagent chemistries. The PEG6 architecture helps maintain solubility and reduces nonspecific interactions in many assay buffer systems, supporting the practical assembly of clickable reagent components for research and development workflows.