Aminooxy-PEG2-azide | CAS 1043426-13-6

Aminooxy-PEG2-azide is a bifunctional PEG-based click chemistry reagent that combines an aminooxy handle with an azide for bioorthogonal conjugation workflows. It is commonly used in azide-compatible click strategies to install azide-reactive moieties onto biomolecules, surfaces, and polymeric materials while maintaining aqueous solubility and minimizing nonspecific interactions through the short PEG spacer. The aminooxy functionality further supports orthogonal labeling schemes that pair well with oxime-forming chemistries, making this reagent a practical building block for creating well-defined conjugates and imaging or assay-ready constructs.

1. Bioorthogonal Labeling

Aminooxy-PEG2-azide is widely used to generate azide-bearing labeling reagents for bioorthogonal conjugation in chemical biology workflows, including the preparation of probe libraries for mechanistic studies and target engagement assays. Researchers often incorporate the azide functionality to enable downstream click coupling with complementary alkyne partners under mild, aqueous conditions, while the PEG2 spacer helps maintain solubility and reduces aggregation during labeling and purification. The aminooxy group provides an additional orthogonal handle for sequential functionalization strategies, supporting workflows where probes must be attached, modified, and then further diversified without cross-reactivity.

2. Surface And Materials Functionalization

Aminooxy-PEG2-azide is used in biomaterials and interface chemistry to introduce azide functionalities onto coatings, hydrogels, and polymer surfaces for subsequent immobilization of ligands, affinity tags, or reporter groups. The PEG2 segment improves wetting and compatibility with aqueous processing steps, which is advantageous when functionalizing complex substrates such as spin-coated films or porous materials. In many lab and industrial settings, the reagent serves as a practical linker precursor that enables controlled surface modification via azide-reactive click partners, supporting the fabrication of patterned or modular materials for research instrumentation and assay platforms.

3. Molecular Imaging Probe Construction

Aminooxy-PEG2-azide is commonly selected for constructing imaging and detection probes that require stable conjugation handles and flexible linker spacing. The azide group supports modular assembly with alkyne-functional reporters, fluorophores, or enrichment tags, enabling rapid interchange of imaging components during probe optimization. The aminooxy functionality is particularly useful in multi-step labeling designs where probe components are introduced sequentially, helping maintain defined connectivity and improving reproducibility across probe batches used in molecular imaging and analytical development.

4. Diagnostic Reagent And Assay Platforms

Aminooxy-PEG2-azide is applied in the development of diagnostic reagent components and assay-ready conjugates that rely on modular attachment chemistries. By installing an azide handle onto capture molecules, polymers, or nanoparticles, teams can standardize downstream coupling to detection reagents using complementary click partners, facilitating scalable workflows for reagent prototyping and method transfer. The PEG2 spacer supports consistent conjugate behavior in buffer systems and helps maintain performance-relevant properties such as dispersion and reduced nonspecific binding during assay assembly and reagent storage.