S-Acetyl-PEG3-azide | CAS 1310827-26-9

S-Acetyl-PEG3-azide is a PEG-based azide click handle designed for bioorthogonal conjugation workflows, where the azide functionality enables widely used azide–alkyne cycloaddition chemistry. The reagent combines a short polyethylene glycol spacer with an acetyl-protected azide motif, supporting robust downstream labeling of biomolecules, surfaces, and soft materials while improving solubility and conjugation accessibility. Because PEG spacers are frequently selected to tune hydrophilicity, reduce nonspecific interactions, and provide spatial separation, S-Acetyl-PEG3-azide is commonly incorporated into probe and material construction pipelines in chemical biology and molecular imaging research.

1. Biomolecule Labeling

S-Acetyl-PEG3-azide is used as a convenient azide-bearing linker for attaching PEGylated tags to proteins, peptides, and other biomolecular scaffolds that are compatible with click-based conjugation strategies. Researchers select this reagent when they want to introduce a restrained, short PEG spacer that can improve dispersion in aqueous labeling buffers and help maintain accessibility of the reactive handle during subsequent bioconjugation steps. The acetyl-protected design is often leveraged in workflows where azide presentation is coordinated with a labeling sequence, enabling controlled incorporation of the click functionality into complex biological constructs.

2. Surface and Material Functionalization

S-Acetyl-PEG3-azide supports the preparation of azide-functional surfaces and polymer materials used for immobilizing ligands, assembling multicomponent coatings, and building modular material architectures. In biomaterials and materials chemistry settings, the PEG3 spacer helps reduce steric crowding at the interface and can mitigate nonspecific adsorption, which is valuable when creating diagnostic reagent surfaces, biosensor interfaces, or cell-interaction platforms for research use. The azide handle enables efficient coupling to complementary alkyne partners, allowing rapid exchange of capture molecules or reporter components without redesigning the underlying surface chemistry.

3. Molecular Imaging Probe Construction

S-Acetyl-PEG3-azide is widely used in molecular imaging and chemical biology tool development to install a click-compatible handle onto imaging reporters, affinity reagents, and scaffolded probe constructs. The short PEG spacer is particularly attractive for probe assembly because it can influence the overall hydrophilicity and presentation of the conjugation site, which is important when building libraries of structurally related probes for imaging modality development. By providing a standardized azide functionality, S-Acetyl-PEG3-azide integrates smoothly into modular labeling schemes that combine targeting components with visualization reporters through orthogonal click coupling.

4. Diagnostic Reagent and Assay Platforms

S-Acetyl-PEG3-azide is applied to create azide-functional components used in diagnostic reagent development and assay platform prototyping, including conjugated detection reagents and multivalent binding constructs. Teams in diagnostic chemistry and assay engineering often favor PEG-based linkers to improve reagent solubility and reduce background interactions in complex assay matrices. The reagent’s azide functionality enables straightforward downstream conjugation to alkyne-bearing detection moieties, facilitating rapid iteration of assay formats such as multiplexed reagent panels and standardized conjugate libraries.