FITC-Dextran (MW 4000) is a marker consisting of coupling fluorescein-isothiocyanate to dextran (4 kDa). FITC-Dextran are polysaccharides comprised of varying lengths of branched glucose molecules and can be used to determine solute, ion and protein permeability of the blood-brain barrier (BBB) based on the size of the dextran used[1][2][3] Reference: [1]. Natarajan R, et al. Fluorescein Isothiocyanate (FITC)-Dextran Extravasation as a Measure of Blood-Brain Barrier Permeability. Curr Protoc Neurosci. 2017 Apr 10;79:9.58.1-9.58.15. [2]. Hoffmann A, et al. High and Low Molecular Weight Fluorescein Isothiocyanate (FITC)-Dextrans to Assess Blood-Brain Barrier Disruption: Technical Considerations. Transl Stroke Res. 2011 Mar;2(1):106-11. [3]. Eriksson I, et al. Analysis of Lysosomal pH by Flow Cytometry Using FITC-Dextran Loaded Cells. Methods Mol Biol. 2017;1594:179-189.
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