Cyanine5 azide | CAS 1267539-32-1

Cyanine5 azide is a cyanine dye azide designed for copper-catalyzed azide-alkyne cycloaddition (CuAAC) click labeling. As a fluorescent azide, it enables efficient installation of a bright Cy5 reporter onto biomolecules, polymers, and surfaces bearing complementary alkyne handles, supporting fluorescence imaging and assay development in chemical biology workflows.

1. Biomolecule Click Labeling

Cyanine5 azide is commonly used by chemical biology and glycobiology groups to fluorescently tag proteins, peptides, and other biomolecules after introducing an alkyne functional group. Researchers rely on the Cy5 fluorophore for far-red fluorescence readouts in microscopy and plate-based assays, while the azide functionality provides a straightforward click handle for modular conjugate construction. This workflow is frequently used to generate fluorescent standards, labeling controls, and imaging reagents for studying biomolecular interactions in complex mixtures.

2. Fluorescent Probe Construction

Cyanine5 azide is frequently incorporated into fluorescent probe development where a Cy5 reporter is needed at a defined position within a larger targeting or recognition scaffold. Teams building modular probe libraries use the azide to couple Cy5 into oligonucleotide, peptide, or polymer-based platforms that already contain alkyne sites, enabling rapid iteration of probe architecture without changing the fluorophore. The resulting Cy5-labeled constructs are used in fluorescence imaging experiments, binding studies, and fluorescence-based assay development where a stable far-red signal is advantageous for background reduction in multi-component samples.

3. Surface And Polymer Functionalization

Cyanine5 azide is used in biomaterials and materials science to create fluorescently addressable surfaces and polymer conjugates via click immobilization. Researchers functionalize hydrogels, nanoparticles, or polymer coatings with alkyne groups and then install the Cy5 azide to generate spatially traceable materials for imaging-guided experiments, material tracking, and surface characterization. This approach is also used to prepare fluorescently labeled scaffolds for studying biomaterial interactions and for developing assay substrates where the dye serves as a robust optical reporter.

4. Multiplex Fluorescence Assays

Cyanine5 azide is a practical reagent for building multiplex fluorescence assays where far-red Cy5 emission is separated from other fluorophores in the same experiment. Assay developers use Cy5 click labeling to generate labeled reagents such as fluorescent oligonucleotide conjugates, tagged binding partners, or fluorescent detection components that can be combined with other channels. In workflow formats including endpoint fluorescence measurements and imaging-based readouts, the azide click functionality supports consistent reagent preparation and batch-to-batch reproducibility of the Cy5-labeled components.