DBCO-PEG1-acid | CAS 2228857-38-1

DBCO-PEG1-acid is a cyclooctyne-based click chemistry reagent designed for strain-promoted azide–alkyne cycloaddition (SPAAC) with azide-bearing partners under catalyst-free conditions. The structure couples a DBCO (dibenzocyclooctyne) cyclooctyne handle to a short PEG spacer terminating in a carboxylic acid, which supports robust conjugation strategies and improved aqueous compatibility. This combination makes DBCO-PEG1-acid widely used in bioconjugation workflows where a stable, bioorthogonal linkage is needed to attach biomolecules, targeting ligands, or imaging handles to functional surfaces and materials.

1. Antibody And Protein Labeling

DBCO-PEG1-acid is commonly employed to install SPAAC-reactive DBCO handles onto proteins, antibodies, and protein scaffolds that have been engineered or functionalized with azide groups. The PEG–carboxylic acid motif facilitates downstream coupling to amines or other activated functional groups on protein conjugation platforms, enabling generation of azide-to-DBCO labeling reagents for research-grade probe construction. In typical laboratory use, this reagent supports modular assembly of multivalent conjugates for flow cytometry reagents, immunoassay development, and protein-based imaging toolkits where orthogonal, catalyst-free click coupling is advantageous.

2. Surface Coatings And Materials

DBCO-PEG1-acid is frequently used in biomaterials and surface engineering to create azide-reactive or DBCO-functionalized interfaces for subsequent SPAAC attachment of biomolecules. The carboxylic acid functionality provides a practical handle for immobilization chemistries on polymeric supports, hydrogel matrices, or activated inorganic/organic surfaces, while the DBCO group enables rapid coupling to azide-bearing ligands under mild conditions. Researchers leverage this approach to build functional coatings for biosensing surfaces, cell-interaction materials, and extracellular matrix mimics, where stable covalent presentation of bioactive components is required.

3. Molecular Imaging Probe Assembly

DBCO-PEG1-acid is well suited for constructing modular molecular imaging probes by enabling SPAAC conjugation to azide-tagged fluorophores, affinity reagents, or imaging moieties. The short PEG spacer helps reduce steric constraints relative to non-spaced cyclooctynes, supporting efficient attachment in probe synthesis workflows that prioritize reproducibility and aqueous compatibility. Imaging-focused laboratories use DBCO-PEG1-acid as a standardized click handle to generate probe libraries for assay development and instrument validation, including multicomponent labeling strategies that require consistent linker architecture.

4. Diagnostic Reagent Conjugation

DBCO-PEG1-acid is used in diagnostic reagent development to prepare click-compatible conjugates that can be assembled into assay-ready formats through SPAAC coupling to azide-functional components. The carboxylic acid group supports integration into conjugation pipelines that produce stable, covalently linked reagent constructs, including labeling of capture/detection reagents and preparation of multivalent binding conjugates for research assays. This reagent is particularly valued in workflows that require bioorthogonal conjugation and careful control of linker spacing to support consistent reagent performance across batch-to-batch manufacturing of laboratory assay components.