Methyltetrazine-Ph-NHS ester | CAS 1644644-96-1

Methyltetrazine-Ph-NHS ester is a tetrazine-functionalized NHS ester designed for click chemistry–enabled bioconjugation workflows. As an electrophilic NHS ester, it readily reacts with primary amines on biomolecules and biomaterial surfaces, installing a methyltetrazine handle for subsequent inverse electron-demand Diels–Alder (IEDDA) ligation with trans-cyclooctene or strained cyclooctene partners. This combination makes it a practical reagent for building modular conjugates used in chemical biology, molecular imaging reagent development, and surface labeling strategies where controlled tetrazine presentation is required.

1. Amine-Targeted Bioconjugation

Methyltetrazine-Ph-NHS ester is commonly used to functionalize antibodies, antibody fragments, peptides, and enzyme scaffolds by coupling to accessible lysine residues or N-terminal amines. The resulting tetrazine-bearing conjugates are widely adopted in research settings to enable rapid, catalyst-free secondary labeling steps with cyclooctene-tagged probes, nanoparticles, or affinity reagents. This two-step modular approach supports flexible probe exchange, batch-to-batch consistency in labeling, and streamlined workflows for preparing multi-component molecular tools.

2. Molecular Imaging Probe Assembly

Methyltetrazine-Ph-NHS ester supports the construction of imaging and detection reagents where a tetrazine handle is needed to attach imaging moieties, targeting ligands, or signal reporters via IEDDA click chemistry. Researchers frequently use this reagent to pre-install tetrazine on a biomolecule or targeting vector, then perform a final conjugation with cyclooctene-functionalized fluorophores, radiolabeling intermediates, or other reporter constructs. This strategy is particularly valuable when the final imaging component must be varied across experiments while keeping the targeting scaffold constant.

3. Surface and Material Functionalization

Methyltetrazine-Ph-NHS ester is used to introduce tetrazine functionality onto amine-containing surfaces and biomaterial coatings, enabling downstream click-based patterning and assembly. Typical applications include functionalizing polymer films, hydrogel matrices, and bead or membrane platforms that present primary amines for NHS-ester coupling. After immobilization, the tetrazine-modified surfaces can be rapidly decorated with cyclooctene-bearing ligands, reporters, or capture elements, facilitating the fabrication of modular assay formats and spatially controlled chemical interfaces.

4. Diagnostic Reagent Development

Methyltetrazine-Ph-NHS ester is frequently employed in the development of diagnostic and analytical reagents that require orthogonal, efficient conjugation between binding components and detection labels. By installing tetrazine on one reagent partner through NHS-ester chemistry, teams can later couple it to cyclooctene-functionalized signal generators, affinity tags, or assay components using click chemistry under mild conditions. This workflow helps reduce cross-reactivity from conventional labeling routes and supports rapid optimization of reagent pairings for assay prototyping and analytical method development.