DBCO STP ester | CAS 2268816-75-5

DBCO STP ester is a strained cyclooctyne (DBCO)-based click chemistry reagent designed for rapid bioorthogonal conjugation to azide-containing targets. As an activated ester, it couples efficiently to nucleophilic amines on biomolecules and polymers, enabling stable linkage formation while retaining the DBCO handle for subsequent strain-promoted azide–alkyne cycloaddition (SPAAC). This combination makes DBCO STP ester a widely used building block for preparing functional probes, labeling reagents, and modular conjugates in chemical biology, biomaterials, and molecular imaging workflows.

1. Protein And Peptide Labeling

DBCO STP ester is commonly used to functionalize proteins and peptides with a DBCO click handle, supporting downstream SPAAC labeling with azide-bearing dyes, affinity tags, or imaging reporters. Researchers in chemical biology and proteomics workflows rely on this reagent to introduce a defined cyclooctyne functionality onto amine-rich biomolecules, facilitating modular assembly of multicomponent conjugates. The activated ester format is particularly convenient for preparing labeling reagents that can be carried into subsequent azide-click steps without requiring additional synthetic intermediates.

2. Surface Functionalization Of Biomaterials

DBCO STP ester is applied to modify polymeric scaffolds, hydrogel networks, and material surfaces that present accessible amine groups, enabling covalent installation of DBCO moieties for later coupling to azide-functional components. Biomaterials groups use this approach to create clickable interfaces for assembling composite materials, immobilizing bioactive ligands, or generating spatially defined labeling patterns through azide–DBCO conjugation. Because the reagent installs a robust click handle onto the material, it is frequently selected for iterative build-up strategies in which the material is prepared first and then combined with azide-bearing probes or linkers.

3. Antibody And Affinity Reagent Conjugation

DBCO STP ester is frequently used in the preparation of antibody- and binder-based click conjugates by introducing DBCO functionality onto amine groups of affinity reagents. This enables researchers to generate azide-functional imaging or detection components that can be attached via SPAAC under mild conditions, supporting streamlined reagent development for research imaging and assay construction. The ester activation chemistry supports practical conjugation workflows where maintaining the binding capability of the affinity reagent is a key consideration during reagent preparation.

4. Imaging Probe And Reporter Assembly

DBCO STP ester supports the construction of molecular imaging and detection probes by providing a convenient DBCO-functional intermediate that can be clicked to azide-bearing reporter groups. Molecular imaging and diagnostic reagent development teams use this reagent to prepare DBCO-tagged carriers, nanoparticles, or scaffolded probes, which are then assembled with azide-functional fluorophores, luminescent reporters, or enrichment handles. This modular strategy is especially valuable when probe design requires flexible swapping of reporter moieties while keeping the DBCO-bearing platform constant across experiments.

5. Multivalent Targeting Platforms

DBCO STP ester is used to build multivalent targeting and assay platforms where multiple click handles or clickable linkers are required for controlled assembly. In chemical biology and materials-enabled screening workflows, the reagent helps generate DBCO-functional scaffolds that can be combined with azide-containing ligands, polymers, or surface-bound components to produce higher-order conjugates. Such multivalent constructs are often pursued to improve labeling density and to enable structured architectures for probe development, reagent optimization, and platform prototyping.