Sulfo-Cy5 cadaverine is widely used in biological research for labeling and tracking biomolecules due to its fluorescent properties. It is particularly effective in fluorescence microscopy, flow cytometry, and in vivo imaging, allowing scientists to visualize and study cellular processes in real-time. This compound is often conjugated to proteins, peptides, or antibodies to monitor their localization, interactions, and dynamics within cells or tissues. Its water solubility, provided by the sulfonate group, enhances its compatibility with aqueous biological systems. Additionally, it is utilized in drug delivery studies to trace the distribution and uptake of therapeutic agents. Its near-infrared fluorescence makes it suitable for deep-tissue imaging, reducing background autofluorescence and improving signal clarity.