sulfo-Cyanine3 DBCO

sulfo-Cyanine3 DBCO is a sulfonated, water-soluble Cy3-class fluorescent dye equipped with a DBCO (dibenzocyclooctyne) strained-alkyne handle for copper-free click chemistry labeling. This reagent is designed for efficient attachment to azide-functional biomolecules and materials, enabling bright red fluorescence for microscopy and flow-based workflows while maintaining compatibility with aqueous bioconjugation environments.

1. Biomolecule Labeling

sulfo-Cyanine3 DBCO is used by chemical biology and bioconjugation teams to fluorescently label azide-bearing proteins, peptides, and other biomolecular targets through copper-free click chemistry. Researchers commonly incorporate it into labeling workflows for tracking binding, monitoring localization, and comparing conjugate behavior across experimental conditions, including when preserving aqueous compatibility and minimizing labeling stress is important. The sulfonated Cy3 dye format supports robust performance in buffered systems used for protein handling, purification, and downstream imaging.

2. Fluorescence Microscopy Imaging

sulfo-Cyanine3 DBCO supports fluorescence microscopy studies where post-labeling with an azide partner is preferred, such as in multistep staining strategies and probe-conjugate construction. Cell biology laboratories use the Cy3 fluorescence output to visualize labeled biomolecule distributions on coverslips or in imaging chambers, including experiments that require modular assembly of fluorescent conjugates. The DBCO click functionality enables reagent-to-target conjugation immediately before imaging, helping teams generate consistent staining reagents for comparative microscopy experiments.

3. Flow Cytometry Labeling

sulfo-Cyanine3 DBCO is applied in flow cytometry workflows to generate fluorescently labeled biomolecular reagents for population-level analysis. Immunochemistry and cell-surface labeling groups often use azide-functional antibodies, ligands, or other targeting components as click partners, then attach sulfo-Cyanine3 DBCO to produce Cy3-labeled conjugates for single-cell readouts. Its water-soluble sulfonate dye character helps support labeling steps carried out in aqueous buffers compatible with staining, washing, and instrument measurement.

4. Surface And Polymer Functionalization

sulfo-Cyanine3 DBCO is also used in biomaterials and surface engineering to create fluorescently tagged coatings, hydrogels, and polymer constructs from azide-functional surfaces or materials. Materials scientists employ the DBCO click handle to incorporate Cy3 fluorescence into engineered platforms used for imaging-based characterization, such as tracking material distribution, monitoring surface modification uniformity, or visualizing biomaterial interactions. This approach is particularly useful when fluorescent tagging needs to be introduced after surface activation while maintaining aqueous-process compatibility.