DBCO-PEG24-amine TFA salt

DBCO-PEG24-amine TFA salt is a polyethylene glycol (PEG)-spaced dibenzocyclooctyne (DBCO) click chemistry reagent designed for strain-promoted azide–alkyne cycloaddition (SPAAC) with azide-functional partners. The long, flexible PEG chain and terminal amine enable robust conjugation handles for downstream coupling, while the DBCO moiety provides fast, catalyst-free reactivity under typical bioconjugation conditions. This combination is widely used in chemical biology, molecular imaging, and biomaterials workflows where stable, bioorthogonal labeling and modular construct assembly are required.

1. Protein And Peptide Labeling

DBCO-PEG24-amine TFA salt is used to introduce a SPAAC-reactive DBCO group onto proteins and peptides while retaining a flexible PEG spacer that helps reduce steric hindrance and aggregation during labeling. Researchers commonly employ the terminal amine for additional coupling strategies, such as linking to activated esters, isothiocyanates, or other amine-reactive scaffolds, enabling multistep assembly of imaging probes, affinity reagents, and cell-surface tools. The reagent’s PEG length is particularly valuable when conjugation must preserve binding or recognition elements on biomolecules, supporting workflows that require reproducible, site-accessible functionalization.

2. Antibody Conjugation Workflows

DBCO-PEG24-amine TFA salt supports antibody and antibody-fragment conjugation schemes in which a DBCO-bearing intermediate is generated and then reacted with azide-functional targets to build defined bioconjugates. In many supplier and research lab settings, the PEG spacer improves accessibility of the DBCO group, which is important when antibodies are densely functionalized or when conjugation is performed in complex buffers. The amine functionality further enables integration into established bioconjugation pipelines, allowing users to tailor linker chemistry and construct architecture for modular probe generation, including multivalent labeling and standardized reagent preparation for imaging and assay development.

3. Surface Coatings And Biomaterials

DBCO-PEG24-amine TFA salt is applied to functionalize polymer surfaces, hydrogels, and biomaterial interfaces through azide–DBCO click chemistry, providing stable attachment of bioactive or sensing components to material scaffolds. The PEG chain contributes to improved interface compatibility and reduced nonspecific interactions, which is often desirable for coating formulations and materials used in chemical biology and diagnostic reagent development. The terminal amine also provides a practical handle for pre-functionalization steps, such as anchoring to material-reactive chemistries before SPAAC coupling, enabling users to design modular, reproducible material functionalization strategies.

4. Molecular Imaging Probe Assembly

DBCO-PEG24-amine TFA salt is frequently used as a DBCO building block for assembling molecular imaging probes and fluorescent or luminescent reporters via SPAAC with azide-labeled components. The PEG spacer helps maintain probe performance by minimizing steric effects around the reactive site, which can be critical when attaching bulky dyes, affinity tags, or multicomponent reporter systems. The reagent’s amine functionality supports integration into multi-reagent workflows, allowing researchers to generate DBCO-functional intermediates that can be combined with azide-bearing imaging moieties to produce well-defined probe constructs for microscopy, labeling studies, and analytical reagent development.