DBCO-PEG2-amine | CAS 2250216-96-5

DBCO-PEG2-amine is a DBCO-functionalized, short-chain polyethylene glycol (PEG) linker bearing a terminal primary amine, designed for strain-promoted azide–alkyne cycloaddition (SPAAC) click chemistry. The combination of a cyclooctyne (DBCO) handle with a PEG spacer supports efficient conjugation to azide-bearing biomolecules and surfaces while the amine enables downstream coupling to activated carboxylates, NHS esters, or other electrophiles. This reagent is widely used in chemical biology and biomaterials workflows where modular, PEG-mediated attachment of amine-functional payloads to azide tags is required.

1. Azide-Tagged Biomolecule Conjugation

DBCO-PEG2-amine is commonly used to label or functionalize azide-bearing proteins, peptides, glycans, and nucleic-acid-related constructs in click chemistry tool development. The DBCO group provides a fast, catalyst-free SPAAC handle for attaching the PEG-amine linker to azide sites, while the terminal amine allows the resulting conjugate to be further derivatized with dyes, affinity tags, or capture chemistries. Researchers value the PEG spacing for reducing steric constraints and improving conjugate handle accessibility during assay development and reagent screening.

2. PEG Linker for Surface Functionalization

DBCO-PEG2-amine is well suited for preparing azide-functionalized surfaces and then introducing amine-terminated PEG linkers through SPAAC, creating stable, well-defined attachment points for subsequent immobilization steps. In biomaterials and materials science settings, the reagent supports modular surface chemistry where the amine can be used to tether polymers, nanoparticles, or bioactive ligands via standard amide-forming or carbodiimide-based coupling strategies. This approach is frequently used to generate reproducible, spatially controlled functional interfaces for research-grade diagnostics reagents and platform materials.

3. Multivalent Probe and Imaging Reagent Assembly

DBCO-PEG2-amine is used in the construction of multicomponent chemical probes where a PEG-amine “connector” is required to integrate clickable targeting or recognition elements with downstream reporter handles. After SPAAC attachment to azide-containing probe scaffolds, the amine provides a convenient site for coupling to fluorescent dyes, biotin-like affinity motifs, or other reporter modules used in molecular imaging and analytical assays. The short PEG2 spacer helps maintain probe flexibility while preserving accessibility of the primary amine for consistent labeling chemistry across probe batches.

4. Bioconjugation for Polymer and Nanoparticle Engineering

DBCO-PEG2-amine supports bioconjugation workflows that incorporate amine-functional PEG linkers into polymer backbones and nanoparticle coatings. By clicking the DBCO moiety onto azide-bearing polymer segments or nanoparticle surface ligands, the amine terminus becomes a reactive handle for grafting additional functional groups, enabling iterative assembly of composite materials. This strategy is widely applied in chemical biology and industrial R&D for creating customizable, modular materials where stable click-derived attachment points and downstream coupling versatility are both required.