IRDye® 680RD Azide

IRDye® 680RD Azide is a near-infrared IRDye 680 fluorophore equipped with an azide functional group, enabling strain-promoted or copper-free click labeling workflows with complementary cyclooctyne/DBCO partners. Its red-shifted emission supports low-autofluorescence imaging in fluorescence microscopy and fluorescence-based quantification, making it a practical dye building block for bioconjugation reagent development. Researchers commonly use this azide handle to install the IRDye 680 label onto proteins, peptides, antibodies, and other biomolecules while maintaining compatibility with common NIR imaging systems.

1. Biomolecule Labeling

IRDye® 680RD Azide is used to prepare fluorescently labeled biomolecules for imaging and binding studies, where the azide group serves as a reactive handle for click conjugation to DBCO- or cyclooctyne-functionalized targets. Protein engineering and antibody conjugation workflows frequently incorporate this reagent to generate NIR-labeled affinity reagents for tracking binding, assessing conjugate behavior, and visualizing biomolecule localization in fluorescence imaging platforms. Because the dye is designed for near-infrared readout, labeled conjugates are often selected for experiments where background from visible fluorophores and sample autofluorescence can interfere with signal interpretation.

2. Fluorescence Imaging Probes

IRDye® 680RD Azide supports the construction of imaging probes by providing a defined IRDye 680 labeling module that can be installed onto targeting ligands or scaffold molecules through click chemistry. In fluorescence microscopy and whole-sample imaging workflows, researchers use IRDye 680-labeled conjugates to visualize distribution patterns of biomolecular probes and to follow labeling outcomes after conjugation and purification steps. The azide functionality enables modular probe assembly, allowing teams to swap targeting components while keeping the same NIR fluorophore reporter for consistent imaging readouts across related experiments.

3. Surface And Material Functionalization

IRDye® 680RD Azide is applied in biomaterials research to fluorescently tag surfaces and materials via click-compatible immobilization strategies. By reacting the azide with surface-presented DBCO/cyclooctyne groups, laboratories create NIR-active coatings and labeled interfaces for microscopy-based inspection, material localization studies, and fluorescence mapping of functionalized substrates. This approach is frequently used in polymer and hydrogel functionalization workflows where a stable, covalently attached NIR fluorophore is needed to monitor surface chemistry outcomes and spatial distribution of functional groups.

4. Nucleic Acid Conjugate Labeling

IRDye® 680RD Azide is used to generate near-infrared labeled oligonucleotide conjugates for fluorescence-based nucleic acid workflows, leveraging azide-to-cyclooctyne click conjugation to attach the IRDye 680 reporter to DBCO-modified nucleic acid constructs. Molecular biology groups incorporate such labeled oligos as fluorescent tracers in hybridization experiments, nucleic acid binding studies, and assay development where NIR detection helps reduce background from biological matrices. The azide handle also supports modular labeling strategies for building probe sets with consistent fluorescence reporting across different oligonucleotide sequences.