Sulfo-Cy5 amine hydrochloride

Sulfo-Cy5 amine hydrochloride is a sulfonated, amine-functionalized cyanine dye designed for robust fluorescent labeling in aqueous, biologically relevant environments. Its Cy5 spectral profile supports red fluorescence detection in common fluorescence imaging and flow cytometry workflows, while the amine handle enables straightforward conjugation to amine-reactive chemistries or coupling strategies used to prepare labeled antibodies, peptides, and other biomolecules.

1. Antibody And Protein Labeling

Sulfo-Cy5 amine hydrochloride is widely used by antibody and protein engineering groups to generate fluorescently labeled immunoreagents for binding studies, target localization experiments, and fluorescence-based characterization of protein interactions. The dye's sulfonated structure helps maintain aqueous compatibility during conjugate preparation and downstream handling, while the amine functionality supports coupling into bioconjugates that are subsequently analyzed by fluorescence microscopy or plate-based fluorescence assays.

2. Fluorescence Microscopy Tracing

Sulfo-Cy5 amine hydrochloride supports cellular and biomolecular tracing experiments where red-channel fluorescence is advantageous for multicolor imaging. Researchers use Cy5-labeled conjugates to visualize uptake, trafficking, and spatial distribution of labeled biomolecules in fixed-cell workflows and in microscopy studies requiring bright, far-red emission for clearer separation from autofluorescence. The dye's water-compatible sulfonate motif helps maintain labeling performance during staining and wash steps typical for imaging sample preparation.

3. Flow Cytometry Dye Conjugates

Sulfo-Cy5 amine hydrochloride is commonly incorporated into fluorescent conjugates used for flow cytometry panels that require a red emission readout. Flow cytometry users prepare Cy5-labeled targets such as proteins, affinity reagents, or labeled secondary reagents to quantify binding to cell-surface markers or to monitor labeled biomolecules in suspension assays. The sulfonated dye format supports aqueous handling and conjugate stability during staining and instrument-compatible detection in red fluorescence channels.

4. Fluorescent Label Standards

Sulfo-Cy5 amine hydrochloride is also used as a fluorescent reference material for assay development and method qualification where a consistent Cy5 signal is needed. Researchers and assay developers incorporate the dye into labeling workflows to establish calibration behaviors for fluorescence readouts, to validate instrument settings, and to support optimization of labeling density and detection conditions for Cy5-based conjugates. This use leverages the dye's defined spectral characteristics and its practical amine functionality for preparing reproducible fluorescent standards and controls.