DBCO-PEG1 | CAS 1839049-33-0

DBCO-PEG1 is a dibenzocyclooctyne (DBCO) functionalized polyethylene glycol (PEG) linker designed for copper-free strain-promoted azide–alkyne cycloaddition (SPAAC) click chemistry. The compact DBCO handle combined with a short PEG spacer supports efficient conjugation while improving solubility and reducing nonspecific interactions compared with purely hydrophobic alkynes. DBCO-PEG1 is commonly used to install clickable DBCO moieties onto biomolecules, polymers, and surfaces for downstream assembly of azide-bearing partners in labeling, materials fabrication, and imaging workflows.

1. Protein And Peptide Labeling

DBCO-PEG1 is widely used in research settings to functionalize proteins and peptides with a stable, bioorthogonal DBCO handle for subsequent conjugation to azide-tagged probes, affinity reagents, or tracking groups. The short PEG spacer helps maintain aqueous compatibility and can reduce steric crowding around the reactive alkyne, which is particularly valuable when labeling folded proteins, enzyme variants, or modular peptide constructs. This reagent is frequently selected when workflows require copper-free click conditions to preserve sensitive biomolecules and to enable straightforward, reproducible coupling to azide-functional imaging or enrichment components.

2. Surface and Material Functionalization

DBCO-PEG1 supports the development of clickable material surfaces and polymeric platforms by providing a DBCO-bearing PEG linkage that can be immobilized or incorporated during surface modification strategies. Researchers use it to create azide-reactive interfaces for assembling multilayer coatings, immobilizing affinity ligands, or patterning functional regions with azide-functional biomolecules and reporter tags. The PEG spacer is also leveraged to improve wettability and to moderate nonspecific adsorption on hydrophilic substrates, making DBCO-PEG1 a practical choice for building reproducible conjugation-ready materials in biomaterials and chemical biology labs.

3. Multivalent Probe Construction

DBCO-PEG1 is commonly employed to generate multivalent click probes by introducing DBCO handles that can be coupled to azide-containing reporter units, targeting motifs, or signal amplification elements. The PEG component provides a flexible tether that can help distribute reactive sites and reduce steric constraints during assembly, which is advantageous when constructing larger conjugates such as polymeric reporters, nanoparticle-associated ligands, or modular reagent libraries. In molecular imaging and diagnostic reagent development contexts, DBCO-PEG1 is often selected to streamline the stepwise construction of complex probe architectures from well-defined azide-bearing building blocks.

4. Polymer Conjugation And Crosslinking

DBCO-PEG1 is used to functionalize PEGylated polymers and polymer backbones with DBCO groups, enabling subsequent coupling to azide-functional polymers, crosslinkers, or pendant functional units. This approach is prevalent in materials science and chemical biology where researchers need controlled, orthogonal assembly routes to tune solubility, spacing, and conjugation density. By pairing a PEG tether with SPAAC-compatible DBCO chemistry, DBCO-PEG1 helps create conjugates and polymer networks that can be assembled under mild, copper-free conditions, supporting reproducible downstream processing for assay reagents, coatings, and engineered biomaterial constructs.