Widely used in biochemical and analytical applications as a fluorescent labeling reagent. Its high fluorescence quantum yield and stability make it ideal for tagging primary amines in proteins, peptides, and amino acids for detection and quantification. Commonly employed in fluorescence spectroscopy, HPLC detection, and enzyme activity assays. Frequently used to study protease function, where cleavage of a dansylamide-labeled substrate produces a measurable fluorescent signal. Also applied in cellular imaging for tracking molecules due to its ability to penetrate membranes and emit strong visible light upon excitation. Valuable in research settings for developing sensitive assays requiring low detection limits.