Sulfo-Cyanine7.5 azide

Sulfo-Cyanine7.5 azide is a water-soluble cyanine dye azide designed for copper-free click chemistry workflows, enabling efficient installation of a bright near-infrared fluorophore onto biomolecules, peptides, and polymeric materials. Its sulfonate functionality supports aqueous labeling conditions, making it a practical reagent for fluorescence imaging reagent development where reduced nonspecific hydrophobic interactions are important. The azide handle provides a robust click handle for downstream conjugate construction and imaging studies using standard NIR fluorescence instrumentation.

1. Biomolecule Fluorescent Labeling

Sulfo-Cyanine7.5 azide is used by chemical biology and imaging labs to generate near-infrared fluorescent conjugates for tracking proteins, peptides, and other biomolecules in vitro. Researchers typically incorporate the dye into labeling workflows that start from azide-reactive partners (e.g., strained alkyne handles introduced by prior derivatization) to produce stable fluorescent bioconjugates for fluorescence microscopy and whole-well or plate-based readouts. Because the dye is sulfonated, conjugation and subsequent handling are commonly performed in aqueous buffers, supporting workflows where dye aggregation and hydrophobic background can otherwise complicate signal interpretation.

2. NIR Imaging Probe Construction

Sulfo-Cyanine7.5 azide supports the development of NIR molecular imaging reagents used in fluorescence-guided localization and biodistribution-style studies at the research level. Teams in microscopy and molecular imaging often use the azide dye as a modular fluorophore source to build targeted or non-targeted imaging constructs, including fluorescent tracers for cell-associated imaging experiments and labeling of extracellular or cell-surface components. The near-infrared emission profile is leveraged to reduce interference from autofluorescence in many biological sample types, enabling clearer visualization of labeled targets in fluorescence imaging platforms that accept NIR channels.

3. Polymer And Surface Functionalization

Sulfo-Cyanine7.5 azide is frequently applied in biomaterials and surface engineering to introduce NIR fluorescence into hydrophilic polymer matrices and functional coatings. Materials scientists use the azide dye to prepare fluorescently labeled hydrogels, nanoparticles, and polymer conjugates by click-based incorporation into alkyne-functional substrates, supporting studies of material distribution, surface coverage, and labeling stability during experimental handling. In these applications, the sulfonate group helps maintain dye compatibility with aqueous processing steps used for biomaterial fabrication and subsequent imaging characterization.

4. Fluorescent Assay Reagent Development

Sulfo-Cyanine7.5 azide is also used as a fluorophore building block for fluorescence-based assay development where a near-infrared readout is preferred for background reduction. Assay developers incorporate the dye into conjugates that serve as fluorescent reporters in binding and labeling assays, including workflows where fluorescent signal is monitored by plate readers or imaging systems with NIR detection channels. The azide functionality enables straightforward construction of fluorescent reagents from click-compatible components, supporting rapid generation of assay-specific probes and standards for experimental optimization.