m-PEG3-Sulfone-PEG4-propargyl | CAS 2055041-02-4

m-PEG3-Sulfone-PEG4-propargyl is a polyethylene glycol (PEG)-based click chemistry reagent featuring a propargyl (alkyne) handle for copper-catalyzed azide–alkyne cycloaddition (CuAAC) and a sulfone-containing PEG architecture that supports aqueous compatibility and controlled spacer length. The multivalent PEG framework is commonly used to tune hydrophilicity, reduce nonspecific interactions, and improve conjugation performance in bioconjugation workflows. As a research-grade alkyne building block, it is widely employed to functionalize biomaterials, surfaces, and imaging/assay constructs via modular attachment to azide-bearing partners.

1. Surface And Interface Labeling

m-PEG3-Sulfone-PEG4-propargyl is used to introduce a click-reactive alkyne functionality onto surfaces and interfaces for downstream coupling with azide-modified probes, polymers, or biomolecules. Researchers often select this PEG–sulfone spacer to improve wettability and minimize nonspecific adsorption on sensor chips, microarrays, and functionalized substrates, enabling more reproducible immobilization of capture ligands or reporters. The reagent’s defined PEG length also helps maintain accessibility of the attached azide-reactive components, which is particularly valuable for creating stable, low-background labeling layers in molecular imaging and analytical assay development.

2. Hydrogel And Biomaterial Conjugation

m-PEG3-Sulfone-PEG4-propargyl supports the fabrication of PEG-containing biomaterials and hydrogels where controlled incorporation of clickable sites is needed for modular post-functionalization. In biomaterials science, the reagent is typically used to generate alkyne-functional networks or pendant groups that can be coupled to azide-bearing crosslinkers, peptides, or affinity tags, allowing researchers to tailor cell-interaction motifs, diffusion properties, or binding architectures without reworking the entire material synthesis. The sulfone-PEG scaffold is also leveraged to balance mechanical/chemical stability with aqueous processability, making it a practical choice for constructing reproducible conjugation-ready materials for research tools and diagnostic reagent platforms.

3. Multivalent Probe And Polymer Assembly

m-PEG3-Sulfone-PEG4-propargyl is frequently incorporated into multivalent probe designs and PEGylated polymer conjugates where the alkyne handle enables efficient coupling to azide-functional imaging dyes, affinity reagents, or reporter units. The PEG-based spacer helps present bulky cargo with improved solubility and reduced aggregation, which is advantageous when assembling complex macromolecular constructs for fluorescence, luminescence, or other label-based detection formats. By providing a modular click handle separated by a tunable PEG/sulfone environment, this reagent is well-suited for building libraries of conjugates used in chemical biology, assay optimization, and molecular imaging reagent development.

4. Diagnostic Reagent And Assay Platforms

m-PEG3-Sulfone-PEG4-propargyl is applied in the preparation of diagnostic reagent components and assay platforms that rely on azide–alkyne click conjugation to install detection or capture functionalities under standardized conditions. Laboratory teams use this reagent to generate alkyne-functional linkers for coupling to azide-bearing antibodies, aptamers, enzymes, or polymeric reporters, supporting consistent reagent assembly for multiplexing and workflow scalability. The PEG–sulfone architecture is particularly useful for reducing background signal and improving reagent handling in aqueous assay buffers, where minimizing nonspecific interactions can be critical for robust analytical readouts.