sulfo-Cyanine5 DBCO

Sulfo-Cyanine5 DBCO is a water-soluble, DBCO-functionalized cyanine dye designed for copper-free click chemistry labeling and fluorescent conjugate construction. Its sulfonate groups support aqueous handling, while the Cy5 chromophore provides fluorescence in the red spectral region for imaging, tracking, and assay development workflows. Researchers use this reagent to install a Cy5 fluorophore onto biomolecules, polymers, and surfaces via strain-promoted azide-alkyne cycloaddition (SPAAC), enabling robust fluorescent readouts without copper catalysts.

1. Biomolecule Labeling

Sulfo-Cyanine5 DBCO is widely used for fluorescent labeling of azide-bearing biomolecules in chemical biology and bioconjugation workflows. Common targets include azide-functionalized peptides, proteins, and glycans used in binding studies, receptor/ligand characterization, and affinity reagent development. By attaching the Cy5 dye through SPAAC, researchers generate stable fluorescent conjugates for downstream fluorescence microscopy and plate-based fluorescence assays, where red emission is advantageous for multiplexing and reduced spectral overlap with green channels.

2. Fluorescence Microscopy Imaging

Sulfo-Cyanine5 DBCO supports cellular and biomolecular imaging experiments that rely on red fluorescence to visualize labeled targets with good background control. In practice, investigators use Cy5-labeled conjugates prepared from azide-functionalized cell-surface ligands, biomolecular probes, or polymeric carriers to track localization and binding behavior in microscopy studies. The DBCO handle enables straightforward conjugate assembly after azide installation, helping labs standardize staining workflows for fixed-sample imaging and fluorescence-based cellular visualization.

3. Flow Cytometry Labeling

Sulfo-Cyanine5 DBCO is used to generate Cy5-tagged conjugates for flow cytometry experiments where red-channel fluorescence is required to quantify labeled populations. Researchers commonly prepare fluorescent staining reagents by clicking the DBCO dye onto azide-containing antibodies, aptamers, or other targeting ligands used to label specific cell-associated features. The sulfonated Cy5 dye supports aqueous staining workflows, and the resulting fluorescent conjugates are used to measure binding/uptake readouts and to support multicolor panel design using Cy5 as a distinct spectral component.

4. Surface And Hydrogel Functionalization

Sulfo-Cyanine5 DBCO enables fluorescent surface modification and biomaterial functionalization by reacting with azide groups on engineered substrates. Materials scientists and biomaterials groups use SPAAC to incorporate Cy5 fluorescence into azide-functionalized hydrogels, nanoparticles, and patterned surfaces for imaging-guided material characterization. This approach supports studies of coating uniformity, spatial distribution of functional components, and tracking of labeled biomaterials in microscopy-based analyses, where the red Cy5 channel provides clear contrast against autofluorescent backgrounds.