Dextran is a polysaccharide widely used for drug formulation and used for developing diagnostic agent and application technique including in vivo imaging. As based on hydrophilic polysaccharide of various molecular weight so high solubility and low toxicity are features. Can be used for fluorescence blood vessel contrast medium and also can be used as marker for phagocytosis and internal processing of absorption and extrinsic material by intracellular endocytotic pathway. Marked dextran is a hydrophilic polysaccharide used for microscope research to trace cell movement and report hydraulic characteristic of cytoplasmic matrix by monitoring cell division. Generally marked dextran is transduced by micro injection.BioActs supplys various fluorescence dextran zygote in the range of several molecular weight and Holds various fluorescence marking dextran in the wide range from NIR to UV. This can be used for diagnosis and preparatory stage of new drug development. Fluorophore label: ICG. Excitation/Emission(nm): 785 / 821 nm.