Tetrazine-Ph-acid | CAS 1380500-92-4

Tetrazine-Ph-acid is a tetrazine-functionalized, aromatic acid click chemistry reagent designed for bioorthogonal inverse-electron-demand Diels–Alder reactions with strained trans-cyclooctene (TCO) partners. Its tetrazine core enables rapid conjugation under commonly used aqueous labeling conditions, while the phenyl-acid handle supports practical incorporation into probe, surface, and material workflows. This reagent is frequently selected for modular assembly of molecular imaging agents, affinity probes, and functional biomaterials where controlled attachment to TCO-bearing targets is required.

1. Molecular Imaging Probe Labeling

Tetrazine-Ph-acid is widely used to install tetrazine moieties onto small-molecule or biomolecule-derived scaffolds that later undergo rapid coupling to TCO-modified imaging handles. Researchers employ this reagent in workflows that require modular late-stage assembly of fluorescent, PET/SPECT, or other reporter-bearing constructs, enabling consistent probe generation from standardized TCO-functional intermediates. The aromatic acid functionality also supports convenient downstream formulation and conjugation strategies for maintaining solubility and handle stability during probe preparation and purification.

2. Cell Surface and Biomolecule Conjugation

Tetrazine-Ph-acid is a common choice for bioconjugation experiments that target TCO-presenting biomolecules, affinity ligands, or cell-labeling reagents. In chemical biology and biomaterials research, it supports controlled attachment of tetrazine-bearing probes to TCO-tagged components, facilitating multistep labeling schemes where orthogonal control over reagent timing and stoichiometry is important. The reagent’s acid-bearing aromatic structure helps integrate the conjugation handle into labeling constructs used for microscopy, flow-based assays, and mechanistic studies of binding and uptake, where reproducible probe architecture matters.

3. Diagnostics and Affinity Reagent Assembly

Tetrazine-Ph-acid is applied in the development of diagnostic reagent components that benefit from click-based modular assembly, particularly when TCO-functional capture elements or detection reporters are prepared separately. Diagnostic and assay-development teams use tetrazine chemistry to rapidly generate conjugates from pre-characterized TCO reagents, supporting consistent batch-to-batch construct design for immunoassay-like formats, affinity pull-down tools, and analytical labeling standards. The phenyl-acid motif provides a practical functional element for integrating the reagent into linker systems used to tune reagent behavior during conjugate preparation and assay workflow handling.

4. Functional Biomaterials Surface Modification

Tetrazine-Ph-acid is used to functionalize polymeric and inorganic material surfaces that carry TCO groups or TCO-containing coatings, enabling straightforward grafting of tetrazine-bearing ligands, reporters, or responsive motifs. Biomaterials scientists rely on this approach to create stable, addressable interfaces for biosensing platforms, surface-localized imaging, and materials-based research tools where spatial control of functional group density is important. The aromatic acid functionality supports incorporation into surface-linker chemistries and can improve compatibility with common surface activation and immobilization strategies used in materials fabrication and characterization workflows.