Aminooxy-PEG3-azide | CAS 1306615-51-9

Aminooxy-PEG3-azide is a PEG-based bifunctional click chemistry reagent that combines an azide handle for Cu(I)-catalyzed azide–alkyne cycloaddition (CuAAC) with an aminooxy group for oxime-related conjugation strategies. The short, flexible PEG3 spacer helps present the reactive handles for efficient labeling and minimizes steric congestion in biomolecular and materials contexts. This reagent is commonly used in chemical biology workflows where orthogonal functionalization is needed to attach probes, polymers, or surfaces with controlled spacing.

1. Bioconjugation Probe Labeling

Aminooxy-PEG3-azide is widely used to build multicomponent labeling reagents for chemical biology and assay development, where an azide-functional PEG spacer provides a convenient attachment point to biomolecules or nanoparticles via CuAAC. The aminooxy functionality enables orthogonal conjugation planning, allowing researchers to pre-install one reactive element and then introduce the other using click chemistry. This design is especially useful when constructing imaging or detection probes that require defined linker length and improved solubility, reducing nonspecific interactions that can arise from overly hydrophobic linkers.

2. Surface And Material Functionalization

Aminooxy-PEG3-azide supports downstream modification of solid supports and biomaterials that require stable, handle-rich surfaces for subsequent click-based assembly. The PEG3 spacer improves accessibility of the azide group, which is valuable when immobilizing alkyne-bearing ligands, affinity tags, or reporter molecules onto polymer films, hydrogel matrices, or bead surfaces. In industrial and research settings, this reagent is frequently selected to create modular surfaces that can be rapidly populated with diverse functional components through standardized azide–alkyne coupling steps.

3. Imaging And Molecular Probe Construction

Aminooxy-PEG3-azide is used as a linker reagent in the synthesis of molecular imaging and fluorescence-based research tools, where azide chemistry provides a reliable route to install reporters onto complex scaffolds. The PEG3 spacer helps maintain probe dispersibility and can reduce aggregation tendencies, which is important for consistent labeling and signal readout in optical and molecular imaging experiments. Researchers commonly incorporate Aminooxy-PEG3-azide into probe design to enable stepwise assembly, pairing orthogonal conjugation logic with click-compatible azide presentation for flexible final coupling.

4. Glycan And Biomolecule Tagging

Aminooxy-PEG3-azide is applicable to biomolecule tagging workflows that require orthogonal handle placement on glycans, oxidized carbohydrates, or other functionalized biomolecular substrates. The aminooxy group is leveraged to support conjugation strategies that complement azide-based click labeling, enabling sequential or modular build-outs of labeled biomolecules for research assays and reagent libraries. The PEG3 linker contributes to controlled spatial presentation of the azide moiety, which can be advantageous when labeling bulky biomolecular targets or when minimizing steric effects during subsequent CuAAC coupling to alkyne-functional partners.