Cy3 dimethyl iodide, a dye derivative of Cyanine 3 (Cy3), features a dimethyl group in its iodide salt form, enhancing its water solubility for usage in aqueous solutions. Cy3, a near-infrared fluorescent dye, is frequently employed in biolabeling and cell imaging, binding to biomolecules like proteins and antibodies to monitor their location and dynamics in biological samples.
DiI iodide1 is one of lipophilic fluorescent stains for labeling membranes and other hydrophobic structures. The fluorescence of these environment-sensitive dyes is greatly enhanced when incorporated into membranes or bound to lipophilic biomolecules such as proteins although they are weakly fluorescent in water.