DSPE-PEG5-propargyl | CAS 2112737-93-4

DSPE-PEG5-propargyl is a lipid–polymer conjugate built from the phospholipid DSPE (distearoyl phosphatidylethanolamine) bearing a short PEG spacer terminated with a propargyl group. As a click chemistry reagent, it provides a terminal alkyne handle for copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) and related strain-promoted variants when compatible conditions are used. This amphiphilic structure is widely used to functionalize lipid-based nanoparticles, liposomes, and supported lipid layers, where the PEG chain improves colloidal stability and the propargyl group enables modular attachment of azide-bearing ligands, imaging tags, or biomolecular recognition elements.

1. Liposome Surface Functionalization

DSPE-PEG5-propargyl is commonly used to introduce reactive alkyne functionality onto liposome and nanovesicle surfaces, enabling subsequent CuAAC coupling with azide-functional dyes, affinity ligands, or polymeric reporters. Researchers use this approach to create vesicles with defined surface chemistry while maintaining the self-assembly and stealth-like behavior associated with PEGylated lipid formulations. The propargyl terminus provides a convenient conjugation handle for building multicomponent vesicles, such as dual-labeled imaging constructs or vesicles displaying targeting motifs alongside tracking groups.

2. Nanoparticle PEG-Ligand Coupling

DSPE-PEG5-propargyl is routinely incorporated into lipid nanoparticle (LNP) and related self-assembled nanoparticle workflows to enable post-insertion or formulation-time installation of clickable PEG chains. The alkyne handle supports modular decoration with azide-bearing components, including fluorescent reporters for uptake studies, bioconjugation tags for tracking, and engineered binding elements for assay development. This strategy is particularly valued in materials and chemical biology labs that need rapid interchangeability of surface ligands across screening campaigns and characterization pipelines.

3. Biomolecule Labeling Probes

DSPE-PEG5-propargyl is used as a lipid-anchored click handle for preparing membrane-associated labeling probes and conjugates that interface with biological interfaces such as cell-mimetic surfaces or protein-containing systems. By coupling the propargyl group to azide-functional imaging dyes, affinity moieties, or assay reporters, users generate tools with controlled presentation of the lipid anchor and adjustable spacing provided by the PEG segment. Such constructs are frequently applied in mechanistic studies of surface interactions, platform validation for conjugation chemistry, and development of membrane-relevant reagent libraries.

4. Supported Lipid Layer Patterning

DSPE-PEG5-propargyl is well suited for creating patterned or functional supported lipid layers (SLBs) and related surface coatings where spatially controlled click coupling is needed. After establishing the lipid layer, the propargyl-functional PEG provides a reactive site for azide-bearing molecules to be immobilized on demand, supporting workflows that require stable surface presentation of fluorescent markers, capture reagents, or biochemical probes. This application is valuable in biointerfaces research and diagnostic reagent development where reproducible surface chemistry and modular functionalization are essential.