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F2456

Sigma-Aldrich

Fluorescein (free acid)

Dye content 95 %

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Empirical Formula (Hill Notation):
C20H12O5
CAS Number:
Molecular Weight:
332.31
Colour Index Number:
45350:1
Beilstein/REAXYS Number:
94324
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

form

powder

Quality Level

composition

Dye content, 95%

mp

320 °C (lit.)

λmax

496 nm

ε (extinction coefficient)

≥12000 at 282-286 nm
≥39000 at 236-240 nm
≥70000 at 488-492 nm

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

Oc1ccc2c(Oc3cc(O)ccc3C24OC(=O)c5ccccc45)c1

InChI

1S/C20H12O5/c21-11-5-7-15-17(9-11)24-18-10-12(22)6-8-16(18)20(15)14-4-2-1-3-13(14)19(23)25-20/h1-10,21-22H

InChI key

GNBHRKFJIUUOQI-UHFFFAOYSA-N

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1 of 4

This Item
F6377F7378I9271
vibrant-m

F2456

Fluorescein (free acid)

vibrant-m

F6377

Fluorescein sodium salt

vibrant-m

F7378

Fluorescein diacetate

vibrant-m

I9271

5-(Iodoacetamido)fluorescein

λmax

496 nm

λmax

-

λmax

-

λmax

-

form

powder

form

powder

form

powder

form

powder

composition

Dye content, 95%

composition

-

composition

-

composition

-

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

ε (extinction coefficient)

≥12000 at 282-286 nm, ≥70000 at 488-492 nm, ≥39000 at 236-240 nm

ε (extinction coefficient)

-

ε (extinction coefficient)

≥86000 at 488-494 nm in 0.1 M NaOH

ε (extinction coefficient)

-

General description

Fluorescein (free acid, CI 45350) is a xanthene dye. Fluorescein (free acid) molecule can be divided into two parts. One part contains xanthene moiety which acts as fluorophore and the other part of the molecule bears benzene moiety which is the fluorescence-controlling moiety.

Application

Fluorescein (free acid) has been used as a staining agent in retinal imaging.
Fluorescein (free acid) is widely used as a fluorescent stain and trace for many living cells and tissue applications. It is also suitable as a marker for the study of motility of bile canaliculi. Some of the clinical applications are evaluating the ocular surface and delineation of brain regions lacking a blood-brain barrier to permit accurate surgical resection of malignant glioma. Fluorescein angiography helps investigate changes in retinal blood supply. Fluorescein also plays a role as a physiological tracer to characterize the salmon′s intestinal permeability (Schep et al., 1998), and for the fluorophotometric measurement of aqueous humor flow. It is widely employed as a quantum yield standard.

pictograms

Exclamation mark

signalword

Warning

hcodes

Hazard Classifications

Eye Irrit. 2

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


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