FITC-dextran

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Dextran sulfate sodium (DSS) for colitis
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Product Catalogue & Brochure

FITC-dextran

CAS Number: 60842-46-8

Fluorescein isothiocyanate (FITC)-dextrans are synthesised by coupling fluoresceinyl isothiocyanate (5-isomer) to selected dextran fractions. All the batches are checked for molecular weight, degree of substitution, loss on drying and free FITC. TdB Labs produces FITC-dextrans from 4 kDa to 2000 kDa that are supplied as a yellow to orange powder.

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Structure
Dextran is a branched polysaccharide elaborated by the bacteria Leuconostoc mesenteroides B512F. Dextran is essentially a linear glucose chain linked by α-D-(1 – 6) linkages. The degree of branching is about 5 %. The fluorescein moiety is attached by a stable thiocarbamoyl linkage and the labelling procedure does not lead to any depolymerization of the dextran. FITC-dextrans have from 0.001-0.020 mol FITC per glucose unit. These low levels of substitution confer minimal charges to dextran, which is an essential requirement for permeability studies.

Spectral data
FITC-dextran has an excitation maximum of 490 – 495 nm and an emission maximum of 520 ± 5 nm. Maximal intensity is observed at pH >8.

Storage and stability
FITC-dextran is stable for more than 6 years when stored dry in well-sealed containers at ambient temperature. Studies at 37°C in rabbit plasma, muscle homogenate, liver homogenate and urine established that FITC-dextran is stable for at least 3 days. No changes in the molecular weight and no release of fluorescein moieties were noted (1).

Solubility
FITC-dextran dissolves readily in water.

Application
FITC-dextran is mainly used for studying permeability and microcirculation. It can also be used as a molecular size marker, for studies of drug delivery and more. Read more about applications here. FITC-dextrans are also very sensitive to the pH of their environment and they can be utilized as pH-indicators. Read more about pH indicators here.

References

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