Propargyl-PEG4-tetra-Ac-beta-D-galactose | CAS 1397682-61-9

Propargyl-PEG4-tetra-Ac-beta-D-galactose is a PEGylated, multivalent galactose-based click chemistry reagent designed for copper-free or copper-catalyzed azide–alkyne cycloaddition workflows. The molecule combines an alkyne handle for bioorthogonal conjugation with a tetra-acetylated galactose motif that supports cell-surface glycobiology targeting strategies and improves membrane interaction in glycan-focused experiments. Its multivalent, PEG-mediated architecture makes it well suited for building stable glycoconjugates, imaging probes, and functionalized biomaterials where controlled presentation of galactose ligands is essential.

1. Glycan Targeting Probes

Propargyl-PEG4-tetra-Ac-beta-D-galactose is widely used to generate galactose-displaying molecular probes for studying lectin–glycan interactions and carbohydrate-mediated binding on model cell surfaces. Researchers typically conjugate the reagent to azide-functional fluorophores, affinity tags, or imaging reporters to create multivalent glycan constructs with improved aqueous compatibility and reduced nonspecific aggregation. The PEG4 spacer helps tune ligand accessibility, which is particularly valuable when comparing binding behavior across different probe densities or linker lengths in glycobiology assays.

2. Cell-Surface Labeling Workflows

Propargyl-PEG4-tetra-Ac-beta-D-galactose supports downstream click-based labeling strategies for mapping galactose-recognizing pathways in complex biological samples. By installing the alkyne-bearing galactose scaffold onto azide-functional partners, investigators can produce stable glycoconjugates that are compatible with flow cytometry, fluorescence microscopy, and high-content imaging workflows used in carbohydrate research. The tetra-acetylated galactose design is commonly selected when researchers want enhanced uptake or effective presentation of the galactose motif prior to conjugation, enabling more informative labeling of glycocalyx-associated structures.

3. Multivalent Biomaterial Functionalization

Propargyl-PEG4-tetra-Ac-beta-D-galactose is used to functionalize azide-bearing hydrogels, polymer surfaces, and biomaterial coatings with galactose ligands for studying adhesion, uptake, and cell–material interactions driven by carbohydrate recognition. The PEG spacer and multivalent presentation help create ligand-rich interfaces that better mimic natural glycan density than monovalent analogs. In materials development, the reagent is commonly incorporated during surface modification or post-functionalization steps, allowing researchers to tune ligand density and spatial presentation for reproducible experiments in biomaterials science and chemical biology.

4. Imaging and Diagnostic Reagent Building

Propargyl-PEG4-tetra-Ac-beta-D-galactose is frequently selected as a galactose-bearing platform for constructing research-grade imaging reagents and carbohydrate-targeted diagnostic tool components. After click conjugation to azide-functional reporters such as fluorogenic dyes, quencher–reporter pairs, or affinity handles, the resulting glycoconjugates can be used to visualize glycan-dependent binding events in assay formats and microscopy-based readouts. The PEG-mediated architecture and alkyne handle make it convenient for assembling modular probe libraries where consistent galactose presentation is required across different reporter chemistries.