Azido-PEG10-amine | CAS 912849-73-1

Azido-PEG10-amine is a PEG-based primary amine functionalized with an azide group, designed for copper-free and copper-mediated azide–alkyne click chemistry workflows. The flexible PEG spacer supports aqueous solubility and reduces steric constraints during bioconjugation, while the terminal azide enables modular attachment to complementary alkyne-bearing partners. As a versatile linker building block, Azido-PEG10-amine is commonly used to introduce a reactive handle for surface modification, probe assembly, and biomaterial functionalization where controlled spacing and conjugation efficiency are important.

1. Biomolecule Conjugation

Azido-PEG10-amine is widely used as a PEG spacer for preparing azide-functional biomolecules and biomolecule conjugates, including labeling reagents that require a defined linker length between a targeting moiety and a reporter. Researchers incorporate the amine functionality for coupling to activated esters, isothiocyanates, or other amine-reactive chemistries, then use the azide handle to click with alkyne-bearing dyes, affinity tags, or imaging reporters. The PEG10 length is particularly valued when maintaining accessibility of the click partner and minimizing nonspecific interactions in complex biological buffers.

2. Surface and Material Functionalization

Azido-PEG10-amine supports the fabrication of functional surfaces and polymer materials by enabling azide presentation on otherwise inert substrates. Materials scientists use the primary amine to anchor the reagent to surfaces via amide-forming or crosslinking strategies, and then perform click coupling to immobilize alkyne-functional ligands, fluorescent probes, or bioactive coatings. The PEG spacer helps preserve ligand mobility on the surface, which is often critical for consistent binding behavior in assay formats and for reproducible probe density in imaging and detection platforms.

3. Molecular Imaging Probe Assembly

Azido-PEG10-amine is commonly selected for assembling imaging probes where a spacer is required to separate a reactive bioconjugation site from the imaging payload. Probe developers attach Azido-PEG10-amine to an intermediate scaffold through the amine group, then use the azide for rapid click conjugation to alkyne-functional fluorophores, luminescent reporters, or imaging-compatible tags. This modular approach streamlines the construction of probe libraries and allows systematic variation of linker length and spatial presentation without redesigning the core probe chemistry.

4. Diagnostics Reagent Development

Azido-PEG10-amine is used in the development of diagnostic and assay reagents that benefit from robust, modular labeling strategies. Assay engineers incorporate the amine for coupling to carrier proteins, nanoparticles, or solid supports, and then use the azide group to click-connect alkyne-functional detection elements such as enzyme labels, affinity reagents, or signal-generating reporters. The PEG10 spacer can improve reagent performance in heterogeneous assay environments by reducing steric crowding and supporting stable conjugate formation under typical assay handling conditions.