DBCO-PEG1-amine | CAS 2364591-79-5

DBCO-PEG1-amine is a dibenzocyclooctyne (DBCO) functionalized, short PEG linker bearing a terminal primary amine, making it a versatile reagent for strain-promoted azide–alkyne cycloaddition (SPAAC) in bioconjugation workflows. The combination of the highly reactive DBCO cyclooctyne and the PEG spacer supports efficient labeling while improving solubility and reducing nonspecific interactions. The terminal amine enables straightforward downstream coupling to activated carboxylates, isothiocyanates, or other electrophiles commonly used to build imaging probes, affinity reagents, and functional biomaterials.

1. Protein Labeling Conjugates

DBCO-PEG1-amine is widely used to generate azide-reactive protein conjugates where a PEG spacer helps maintain biomolecule accessibility and colloidal stability during labeling. Researchers incorporate this reagent as a DBCO-bearing intermediate to attach functional handles to proteins, including affinity tags, biotin-like motifs, or polymerizable groups, and then complete assembly by SPAAC with azide-functional partners. The terminal amine provides an additional orthogonal site for further derivatization, enabling multistep construct building such as introducing capture ligands or surface-binding moieties after the initial DBCO installation.

2. Surface Immobilization Chemistry

DBCO-PEG1-amine supports immobilization strategies for creating azide-functional surfaces and coatings used in assay development and materials research. The amine functionality is commonly leveraged to anchor the reagent to activated surfaces or to link it into polymer matrices, while the DBCO group serves as the SPAAC-reactive handle for subsequent attachment of azide-bearing biomolecules or nanoparticles. This makes the reagent practical for preparing stable, modular interfaces such as functionalized microarrays, biosensor surfaces, and chromatography media where controlled presentation of clickable ligands improves reproducibility across experiments.

3. Molecular Imaging Probe Building

DBCO-PEG1-amine is frequently selected in molecular imaging and diagnostic reagent development pipelines to construct clickable scaffolds that can be rapidly assembled from azide-tagged components. The PEG spacer and short linker design help reduce steric congestion around the reactive DBCO, which is important when labeling bulky targeting ligands, reporter payloads, or multivalent probe architectures. The terminal amine enables attachment of reporter-adjacent chemistry, allowing probe developers to integrate additional functional groups for conjugate purification, solubility tuning, or conjugation to carrier systems prior to SPAAC coupling with azide-functional imaging reporters.

4. PEG-Linked Biomaterial Functionalization

DBCO-PEG1-amine is used to introduce SPAAC-compatible functionality into biomaterials and soft matrices that require defined chemical handles for later modular assembly. Material scientists use the amine group to incorporate the reagent into crosslinkable networks or to attach it to pre-formed polymers, hydrogels, and scaffold surfaces, while the DBCO moiety enables subsequent coupling to azide-bearing peptides, proteins, or cell-interaction motifs. This approach supports the creation of functional biomaterials where the clickable chemistry allows rapid exchange of ligands and iterative optimization of surface chemistry for research-grade materials characterization.