Azido-PEG20-alcohol | CAS 1637297-21-2

Azido-PEG20-alcohol is a PEG-based azide reagent designed for copper-free and copper-mediated azide–alkyne click chemistry workflows. Its long, flexible poly(ethylene glycol) spacer and terminal azide enable efficient installation of bioorthogonal handles onto surfaces, biomolecule conjugates, and polymeric materials, while the alcohol functionality provides convenient compatibility with downstream derivatization and coating chemistries. Because PEGylated azides are widely used to tune solubility, reduce nonspecific interactions, and improve probe accessibility, Azido-PEG20-alcohol is commonly selected for building blocks in chemical biology, imaging reagent development, and materials functionalization.

1. Biomolecule PEGylation Handles

Azido-PEG20-alcohol is used as a PEG spacer/azide building block to introduce click-ready functionality into proteins, peptides, and nucleic-acid conjugates during probe and reagent assembly. Researchers often incorporate its extended PEG chain to improve aqueous compatibility and to mitigate steric crowding at the conjugation site, which can be important when subsequent labeling steps require efficient access to the azide. The alcohol end can also support practical coupling strategies for attaching the PEG segment to carrier scaffolds before or after click-based installation of reporters, affinity tags, or imaging moieties.

2. Surface And Material Functionalization

Azido-PEG20-alcohol serves as a versatile reagent for creating azide-functional coatings and material surfaces that can be patterned or uniformly functionalized for downstream click conjugation. In biomaterials and interface chemistry workflows, the PEG spacer helps maintain hydration and reduces nonspecific adsorption, supporting cleaner attachment of fluorescent dyes, affinity ligands, and other modular components via azide–alkyne coupling. This makes the reagent attractive for preparing functionalized hydrogels, polymer films, and microarray-ready surfaces where spatially controlled or batch labeling is required.

3. Fluorophore And Imaging Probe Assembly

Azido-PEG20-alcohol is frequently used in molecular imaging and optical probe development as an azide-bearing PEG linker that improves probe solubility and accessibility for subsequent conjugation to alkyne-containing reporters. By providing a defined, flexible distance between the reactive handle and the eventual imaging component, it helps reduce quenching and steric interference that can occur when fluorophores are positioned too close to bulky targeting or scaffold elements. The reagent’s PEG architecture is also leveraged to create imaging reagents compatible with common labeling pipelines, including modular assembly of multi-component probes.

4. Diagnostic Reagent And Assay Building

Azido-PEG20-alcohol is applied as a click-compatible PEG linker for constructing assay reagents and diagnostic research tools that rely on modular conjugation strategies. Many assay development workflows use azide-functional PEG components to standardize labeling density, improve reagent handling in aqueous buffers, and support consistent coupling to alkyne-functional detection elements such as dyes, enzyme labels, or affinity reagents. The alcohol functionality provides additional flexibility for integrating the PEG-azide segment into larger reagent formats, including bead-based assays and surface-tethered assay platforms.