TCO-PEG3-alcohol | CAS 2566420-12-8

TCO-PEG3-alcohol is a polyethylene glycol (PEG)-linked trans-cyclooctene (TCO) click chemistry reagent designed for strain-promoted inverse electron-demand cycloaddition (SPIEDAC) with tetrazines. The flexible PEG3 spacer and terminal alcohol functionality support aqueous handling, conjugation versatility, and robust labeling workflows in chemical biology and biomaterials research. As a TCO-bearing handle, it is commonly incorporated into probes, surfaces, and polymeric platforms to enable rapid, selective ligation to tetrazine-functional partners under mild conditions.

1. Tetrazine Probe Labeling

TCO-PEG3-alcohol is frequently used to prepare TCO-functional labeling reagents for downstream tetrazine-based conjugation to fluorescent dyes, affinity tags, or imaging reporters. Researchers value the PEG3 spacer for reducing steric constraints during tetrazine ligation, which helps maintain strong signal generation in probe assemblies and multicomponent labeling schemes. The terminal alcohol also supports practical derivatization routes, enabling attachment to biomolecule scaffolds, polymer carriers, or small-molecule reporters prior to tetrazine coupling.

2. Biomolecule Conjugation Workflows

TCO-PEG3-alcohol is well suited for generating TCO-modified biomolecular reagents, including TCO-functional linkers used in labeling and tracking experiments across proteomics, glycomics, and receptor-binding studies. The PEG3 linkage improves solubility and compatibility with aqueous bioconjugation buffers, while the TCO moiety provides a standardized handle for modular tetrazine ligation. This makes TCO-PEG3-alcohol a common choice in workflows that require consistent, reproducible attachment of tetrazine-reactive components to proteins, peptides, or other macromolecular constructs.

3. Surface and Material Functionalization

TCO-PEG3-alcohol is applied in the preparation of TCO-functional surfaces and materials where subsequent tetrazine coupling enables spatially controlled assembly of coatings, capture layers, or patterned labeling reagents. The PEG3 spacer supports better surface accessibility of the TCO group, which is important for maintaining reactivity in heterogeneous environments such as hydrogels, polymer films, and functionalized beads. The alcohol handle provides a practical point of attachment for immobilization strategies that integrate with existing material fabrication pipelines.

4. Polymer and Nanocarrier Assembly

TCO-PEG3-alcohol is used to introduce TCO functionality into polymer conjugates and nanocarrier formulations that rely on tetrazine-mediated modular assembly. In these applications, the PEG3 segment contributes to improved dispersibility and reduces non-specific interactions that can complicate multicomponent construction. By incorporating TCO-PEG3-alcohol into carrier architectures, researchers can later attach tetrazine-bearing payloads, enabling flexible design of probe-dense constructs, reagent scaffolds, and library-style material systems used in molecular imaging and chemical biology tool development.