Azido-PEG1-C2-methylamine | CAS 1835759-88-0

Azido-PEG1-C2-methylamine is a PEG-based azide-bearing linker featuring a short two-carbon spacer terminating in a primary methylamine handle. As a modular azide building block, it is commonly used in copper-free or copper-catalyzed azide–alkyne click chemistry workflows to install functional payloads onto biomolecules, surfaces, and polymeric materials while maintaining aqueous compatibility through the PEG segment. The presence of the terminal methylamine further supports downstream conjugation and material functionalization, making this reagent a practical choice for constructing multicomponent probes, tagged polymers, and linker-defined bioconjugates.

1. Biomolecule Labeling

Azido-PEG1-C2-methylamine is widely used to introduce an azide-functional attachment point into proteins, peptides, and other biomolecular platforms that are subsequently coupled to alkyne-bearing partners via click chemistry. The PEG spacer helps reduce steric crowding and improves solubility during labeling and purification steps, which is particularly valuable for preparing uniform, linker-defined conjugates for biochemical assays and imaging tool development. The methylamine terminus can also be leveraged to create additional reactive sites for orthogonal coupling strategies, enabling multistep assembly of complex probe architectures.

2. Surface And Material Functionalization

Azido-PEG1-C2-methylamine supports the creation of azide-functional coatings and materials where click-ready handles are required for post-fabrication modification. Researchers use this reagent to functionalize polymer films, hydrogel networks, and nanoparticle surfaces so that alkyne-functional ligands, dyes, or affinity reagents can be attached under mild conditions. The short PEG segment improves compatibility with hydrated environments and can help maintain accessibility of the azide group at the interface, while the terminal methylamine provides a convenient chemical handle for further material chemistry such as additional coupling to amine-reactive components.

3. Multicomponent Probe Assembly

Azido-PEG1-C2-methylamine is frequently incorporated into modular probe designs that require sequential installation of multiple functional elements using click-compatible chemistry. By providing a defined azide moiety for coupling and a methylamine group for additional derivatization, it enables researchers to build combinatorial reagent sets for molecular imaging reagents, fluorescent labeling constructs, and affinity-tagged detection tools. This dual-handle design is especially useful when probe components must be assembled with controlled linker length and hydrophilicity to maintain performance in labeling workflows and analytical readouts.

4. PEG Linker Platforms For Conjugates

Azido-PEG1-C2-methylamine is used as a practical PEG linker platform in bioconjugation pipelines where controlled spacing between a reactive site and a payload is critical. The reagent’s compact PEG1 segment and C2 spacer help tune local flexibility and accessibility of the clickable azide, supporting consistent conjugate formation across different substrates such as small biomolecules, labeling scaffolds, and polymer-bound reagents. The methylamine functionality also supports downstream derivatization into amine-reactive or amine-compatible conjugation schemes, helping teams rapidly adapt the same core linker to different experimental formats.