Fluoresceinamine, isomer I

Synonyms: 5-Aminofluorescein

Fluoresceinamine, isomer I, also known as 5-Aminofluorescein, is a fluorescent derivative of fluorescein used as a vital labeling reagent in biological research for tagging proteins, nucleotides, and nanoparticles, enabling visualization via fluorescence microscopy or spectrophotometry, especially for identifying pathogens or tumor cells due to its strong green fluorescence (excitation ~490nm, emission ~520nm).