5(6)-Carboxynaphthofluorescein diacetate serves as a fluorescent substrate in esterase assays, where it is cleaved by intracellular esterases, resulting in red fluorescence for enzyme activity measurement (Ex = 590 nm; Em = 645 nm) [1].
TFAX 594,SE is a red fluorescent dye that maintains its fluorescence properties regardless of the pH level, ranging from 4 to 10. This dye produces highly intense and photostable conjugates when combined with proteins or antibodies, such as goat anti-mouse IgG.
BDP 581 591 azide, an azide derivative of the universal, photostable fluorophore BDP 581 591, can be used for conjugation with small molecules and biomolecules to construct tracers for fluorescence polarization assays and microscopy probes [1].