Amino-bis-PEG3-BCN (exo)

Amino-bis-PEG3-BCN (exo) is a bifunctional, PEGylated BCN-based click chemistry reagent designed for strain-promoted azide–alkyne cycloaddition (SPAAC). Its structure combines an amino handle with two BCN (bicyclononyne) groups on short PEG spacers, enabling efficient conjugation and subsequent orthogonal click labeling in complex biomolecular and materials workflows. The exo presentation of the BCN termini supports accessibility for labeling applications where steric accessibility and water compatibility are important.

1. Protein And Peptide Labeling

Amino-bis-PEG3-BCN (exo) is used to install BCN click handles onto proteins and peptides for downstream SPAAC-based tagging with azide-functional partners. Researchers commonly pair the amino group with standard bioconjugation strategies to generate BCN-bearing conjugates, then use azide dyes, affinity tags, or imaging reporters to quantify, visualize, or enrich biomolecules in biochemical assays. The PEG spacers help maintain solubility and reduce nonspecific interactions during labeling, which is valuable for workflows involving sensitive proteins, membrane-associated targets, or multistep labeling pipelines.

2. Surface Functionalization For Biosensors

Amino-bis-PEG3-BCN (exo) is well suited for preparing BCN-functional surfaces and sensor interfaces that require robust SPAAC coupling to azide-modified recognition elements or reporter molecules. The bifunctional nature supports surface attachment through the amino handle while leaving BCN termini available for subsequent click immobilization, enabling controlled grafting densities and improved accessibility compared with monofunctional linkers. This reagent is frequently selected in diagnostic reagent development and analytical platform optimization where reproducible surface chemistry and stable, water-compatible immobilization are critical.

3. Cell Imaging And Biomolecular Tracking

Amino-bis-PEG3-BCN (exo) is applied in chemical biology to generate clickable biomolecular probes for live-cell compatible labeling workflows that rely on SPAAC with azide-bearing fluorophores or affinity probes. By introducing two BCN groups per conjugate, the reagent supports multivalent labeling strategies that can enhance labeling uniformity and signal distribution across complex biomolecular assemblies. The PEG3 spacers and exo BCN orientation help promote efficient probe–target labeling in aqueous media, supporting imaging experiments that require minimal perturbation of probe solubility and conjugate behavior.

4. Hydrogel And Biomaterials Crosslinking

Amino-bis-PEG3-BCN (exo) is used to create click-reactive biomaterials and soft matrices by incorporating BCN functionalities into PEG-based hydrogel networks or polymer scaffolds. After material formation or surface modification, SPAAC coupling with azide-functional crosslinkers, bioactive ligands, or degradable components enables modular assembly and post-fabrication functionalization. The bifunctional, PEGylated design supports formation of well-dispersed reactive sites, which is advantageous when designing materials for mechanistic studies, extracellular matrix mimics, or multicomponent material architectures where spatially controlled incorporation of functional groups is required.