Fluorescein isothiocyanate-dextran (FITC-dextran) is a fluorescently labeled polysaccharide used in biological and biochemical applications. Comprising fluorescein isothiocyanate (FITC) and dextran, it emits green fluorescence when excited by blue light. FITC-dextran is commonly used to study cell permeability, endocytosis, and intracellular processes, and it serves as a tracer in vascular studies and tissue distribution in live animals. It is highly sensitive, versatile, and non-toxic, making it ideal for fluorescence microscopy and in vivo imaging.
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