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Fluorescein isothiocyanate–dextran

average mol wt 500,000

CAS Number:
MDL number:

Quality Level

biological source

synthetic (organic)


FITC conjugate



mol wt

average mol wt 500,000

extent of labeling

0.003-0.020 mol FITC per mol glucose


H2O: soluble 25 mg/mL, clear to slightly hazy, yellow to deep orange

storage temp.


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General description

Dextran is a polymer of anhydroglucose. It is composed of approximately 95% alpha-D-(166) linkages. The remaining (163) linkages account for the branching of dextran. Conflicting data on the branch lengths implies that the average branch length is less than three glucose units. However, other methods indicate branches of greater than 50 glucose units exist. Native dextran has been found to have a molecular weight (MW) in the range of 9 million to 500 million. Lower MW dextrans will exhibit slightly less branching and have a more narrow range of MW distribution. Dextrans with MW greater than 10,000 behave as if they are highly branched. As the MW increases, dextran molecules attain greater symmetry. Dextrans with MW of 2,000 to 10,000, exhibit the properties of an expandable coil. At MW below 2,000, dextran is more rod-like. The MW of dextran is measured by one or more of the following methods: low angle laser light scattering, size exclusion chromatography, copper-complexation and anthrone reagent colorometric reducing-end sugar determination and viscosity.


FITC-dextran is used in cardiovascular, microcirculation, perfusion, cell monolayer and cell membrane permeability research as fluorescent flux tracer compound that supports the measurement of processes such as blood flow, membrane damage, vascular drainage and renal elimination. Small FITC-dextrans are also used to measure processes such as endocytosis and cell junction permeability. Fluorescein-dextran, 500 kDa, may be used as a cerebral spinal fluid (CSF) tracer. FITC-dextran-500 may be used to study endothelial or epithelial monolayer porosity, apical-basolateral movements within cell layers and cell junction permeability.
FITC-dextran is used extensively in microcirculation and cell permeability research utilizing microfluorimetry. FITC-dextran has been used to study plant cell wall porosity and capillary permeability. Plasma proteins have been shown not to bind to FITC-dextran.
Dextran labeled with fluorescein isothiocyanate for possible use in perfusion studies in animals.


1, 5 g in poly bottle
100, 250 mg in poly bottle

Preparation Note

Sigma typically tests the solubility of FITC dextrans in water at concentrations at or above 25 mg/ml. Solutions should be protected from light. In vivo, FITC-dextran is stable for more than 24 hours.


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Hazard Statements

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Jialing Bao et al.
American journal of physiology. Renal physiology, 305(5), F714-F726 (2013-06-28)
Meprin metalloproteases are highly expressed at the luminal interface of the intestine and kidney and in certain leukocytes. Meprins cleave a variety of substrates in vitro, including extracellular matrix proteins, adherens junction proteins, and cytokines, and have been implicated in
Jochen Grommes et al.
PloS one, 7(6), e38917-e38917 (2012-06-16)
Treatment of acute lung injury (ALI) remains an unsolved problem in intensive care medicine. As simvastatin exerts protective effects in inflammatory diseases we explored its effects on development of ALI and due to the importance of neutrophils in ALI also
Guiliang Zheng et al.
BMC neuroscience, 13, 71-71 (2012-06-21)
Exposure to intense noise causes the excessive movement of the organ of Corti, stretching the organ and compromising sensory cell functions. We recently revealed changes in the transcriptional expression of multiple adhesion-related genes during the acute phases of cochlear damage
Stephen Sakuma et al.
Cancer discovery, 11(1), 176-193 (2020-09-30)
Nuclear pore complexes (NPC) are the central mediators of nucleocytoplasmic transport. Increasing evidence shows that many cancer cells have increased numbers of NPCs and become addicted to the nuclear transport machinery. How reducing NPC numbers affects the physiology of normal
L Andrique et al.
Science advances, 5(6), eaau6562-eaau6562 (2019-06-18)
Most achievements to engineer blood vessels are based on multiple-step manipulations such as manual sheet rolling or sequential cell seeding followed by scaffold degradation. Here, we propose a one-step strategy using a microfluidic coextrusion device to produce mature functional blood

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Fluorescein Isothiocyanate-Dextran

Dextran is a polymer of anhydroglucose. It is composed of approximately 95% alpha-D-(166) linkages. The remaining (163) linkages account for the branching of dextran.

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