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Sulfo-Cy5 NHS ester is a sulfonated, hydrophilic and highly water soluble dye. For the labeling of various amine-containing molecules in aqueous phase, no organic co-solvent is needed. This regent is especially useful for the labeling of proteins which denaturate in the presence of organic co-solvents, as well as for proteins with low solubility. Sulfo-Cy5 NHS ester is one of the most popular fluorophores. In life science, the sulfonate groups make the Cy dyes soluble in water and also reduce fluorescence-quenching which can arise from dye-dye interactions.
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