Sulfo-Cyanine7 tetrazine

Sulfo-Cyanine7 tetrazine is a water-soluble tetrazine click reagent designed for rapid inverse-electron-demand Diels-Alder (IEDDA) bioconjugation with trans-cyclooctenes (TCO)-functional partners. Its cyanine7 fluorophore enables direct fluorescent readout of labeled biomolecules, surfaces, and imaging probes, making it useful for constructing targeted molecular imaging reagents and fluorescence-traceable conjugates in aqueous workflows.

1. Targeted Biomolecule Labeling

Sulfo-Cyanine7 tetrazine is used by chemical biology and imaging researchers to fluorescently label TCO-bearing proteins, peptides, antibodies, and affinity ligands through bioorthogonal click chemistry. The sulfonated, water-soluble dye supports conjugation and downstream handling in buffered aqueous systems, enabling researchers to track conjugate formation and perform fluorescence-based localization studies without requiring harsh labeling conditions. This reagent is also commonly applied in probe-construction pipelines where a cyanine7 reporter is needed for follow-on microscopy, imaging, or assay development.

2. Fluorescent Probe Construction

Sulfo-Cyanine7 tetrazine supports fluorescent probe development for molecular imaging workflows where a tetrazine handle is used to install a cyanine7 reporter onto a TCO-functional sensing scaffold. Teams building activatable or modular probes often rely on this chemistry to generate well-defined fluorescent conjugates for screening, method development, and instrument validation. In practice, the dye's near-infrared emission profile is leveraged to reduce spectral overlap with visible fluorophores in multicolor experiments, supporting cleaner imaging readouts when cyanine7-compatible detection channels are available.

3. Surface And Biomaterial Functionalization

Sulfo-Cyanine7 tetrazine is employed in biomaterials science to fluorescently tag TCO-functional surfaces, hydrogels, and polymer coatings for materials characterization and surface mapping. Researchers use the dye-conjugated surfaces to visualize coating uniformity, quantify surface labeling via fluorescence imaging, and verify functionalization steps during device or scaffold development. This application is particularly relevant when the labeling must be performed under aqueous conditions and when a stable fluorescent reporter is required to follow material processing and subsequent experimental handling.

4. In Vivo Imaging Reagent Development

Sulfo-Cyanine7 tetrazine is also used in preclinical research tool development to prepare cyanine7-labeled conjugates for optical imaging experiments, including modular labeling strategies where a TCO-functional targeting component is coupled to a tetrazine-fluorophore. Imaging teams value the click-based modularity for rapid reagent assembly and for producing fluorescent constructs that can be tracked during imaging studies. The sulfonated cyanine7 reporter supports aqueous compatibility during conjugate preparation, helping streamline workflows for fluorescence-based imaging reagent generation.