mPEG4-propyne | CAS 1101668-39-6

mPEG4-propyne is a methoxy-terminated polyethylene glycol (PEG) click handle bearing a terminal propargyl group, enabling copper-free or copper-mediated azide–alkyne cycloaddition workflows depending on the labeling system used. As an mPEG-based alkyne reagent, it is commonly selected for introducing PEG spacers onto azide-functional biomolecules, surfaces, and polymeric materials to improve solubility, reduce nonspecific interactions, and tune hydrodynamic properties. Its small, well-defined PEG architecture makes it a practical building block for downstream probe, conjugate, and materials development where PEGylation is required without introducing large synthetic complexity.

1. Protein And Peptide PEGylation

mPEG4-propyne is widely used to generate PEGylated protein and peptide conjugates via click coupling to azide-bearing targets, supporting workflows in chemical biology and reagent development. Researchers often employ this reagent to install a short PEG spacer that can modulate solubility, alter surface charge presentation, and improve formulation stability for protein labeling reagents. The compact mPEG4 chain is particularly attractive when maintaining native-like size and minimizing steric effects is important for preserving binding-site accessibility in assay development.

2. Surface And Material Functionalization

mPEG4-propyne serves as a PEGylation tool for functionalizing azide-present surfaces, coatings, and polymer scaffolds through click chemistry, enabling the creation of antifouling or biocompatibility-tuned interfaces. In biomaterials science, mPEGylated layers are commonly used to control nonspecific adsorption of proteins and biomolecules, which is valuable for constructing reliable assay platforms, sensor surfaces, and cell-interaction materials. The propargyl terminus provides a convenient handle for integrating PEG into complex material architectures while keeping the PEG length relatively short for controlled surface coverage.

3. Imaging Probe And Tag Construction

mPEG4-propyne is frequently incorporated into labeling strategies for molecular imaging and analytical probe construction, where PEG spacers help manage probe solubility and reduce aggregation in aqueous media. By clicking the alkyne handle onto azide-functional reporter constructs, teams can generate PEG-modified probe libraries that are easier to handle in buffer-based workflows and more compatible with downstream conjugation steps. This reagent is also used to standardize linker length and improve reproducibility across probe batches in platform development for fluorescence, luminescence, or other tag-based detection formats.

4. Polymer Conjugate And Nanomaterial Design

mPEG4-propyne is used in the synthesis of PEG-modified polymer conjugates and nanomaterial surface coatings where azide-functional components are available for click coupling. Materials scientists rely on short PEG chains to tune colloidal stability, influence dispersion behavior, and regulate interfacial interactions that affect performance in analytical and materials applications. The reagent’s terminal alkyne group supports modular assembly of PEGylated architectures, making it a common choice for constructing clickable, well-defined PEG layers on polymer systems and nano-enabled research tools.