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FD70 Sigma-Aldrich

Fluorescein isothiocyanate–dextran

average Mw 59,000-77,000

Synonym: FITC–Dextran



Related Categories Alphabetical, Biochemicals and Reagents, Carbohydrates, Carbohydrates A to Z, Carbohydrates D-F,
Quality Level   100
biological source   bacterial (Leuconostoc mesenteroides)
form   powder
mol wt   average Mw 59,000-77,000
extent of labeling   0.001-0.020 mol FITC per mol glucose
conjugate   FITC conjugate
storage temp.   2-8°C


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.


Dextran labeled with fluorescein isothiocyanate for possible use in perfusion studies in animals.

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.

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. FITC-dextran 70kDa (FD-70) may be used as a model compound for development of methods to deliver molecules into protoplasts and to study drug release from structures such as hydrogels and liposomes. It may be used in microvascular and cell monolayer permeability studies.


Bottomless glass bottle. Contents are inside inserted fused cone.

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.

Safety & Documentation

Safety Information

GHS07  GHS07
Signal word 
Hazard statements 
Target organs 
Respiratory system
Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


FITC-labelled polysaccharides

FITC-Dextran FITC-DEAE-dextran (FDD) FITC-carboxymethyl-dextran (FCM-Dextran) FITC-polysucrose (FITC-Ficoll®) FITC-DEAE-polysucrose FITC-CM-polysucrose (FITC-CM-Ficoll®) FITC-inulin Fluorescein hyalu...
Keywords: Absorption, Amidations, Bacterial conjugations, Cosmetics, Diabetes, Diagnostic, Esterifications, Filtration, Microscopy, Pharmaceutical, Separation, Size-exclusion chromatography, Solvents, Substitutions, Transfection


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.1,2,3  Conflicting data on the br...
Keywords: Bacterial conjugations, Chromatography, Fractionation

Peer-Reviewed Papers


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