Merck, 90718-1G, Fluorescein isothiocyanate–dextran

Fluorescein isothiocyanate–dextran is an anionic fluorescent probe. The carboxyl group provides the negative charge, which improves the overall permeability of the molecule. It is supplied as a yellow powder that is freely soluble in water and electrolyte solutions. Fluorescein isothiocyanate–dextran is insoluble in most organic samples such as ethanol, methanol, acetone, and chloroform., however, it dissolves in DMSO, formamide, and a few other polar organic solvents.