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for fluorescence, free acid

Acid Yellow 73
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for fluorescence


titration: suitable


λex 490 nm; λem 514 nm in 0.1 M Tris pH 8.0


suitable for fluorescence

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InChI key


Gene Information

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Descripción general

Fluorescein dye is the most commonly used fluorescent probe. It is used to stain epithelial defects and analyse the integrity of corneal epithelium. Fluorescein is used in the diagnosis of corneal perforation. Oral or intravenous fluorescein is used in fluorescein angiography to detect diabetic retinopathy and choroidal neovascular membrane.


Fluorescein has been used:
  • in the permeability assay of Caco-2 cells
  • to test its suitability to serve as lifetime fluorescence standards
  • as a fluorophore for the fast recovery of fluorescence peaks and fluorophore concentration in the presence of hemoglobin
  • as a fluorescent probe in oxygen radical absorbance capacity (ORAC) assay


Exclamation mark

Palabra de señalización


Frases de peligro

Clasificaciones de peligro

Eye Irrit. 2

Código de clase de almacenamiento

11 - Combustible Solids



Punto de inflamabilidad F

Not applicable

Punto de inflamabilidad C

Not applicable

Equipo de protección personal

Eyeshields, Gloves, type N95 (US)

Certificado de Análisis

Certificado de origen

  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. What is Product 46955, Fluorescein, soluble in?

    According to the chemicals encyclopedia published by the Royal Society of Chemistry : 13th Edition, Fluorescein is soluble in hot alcohol and glacial acetic acid. Also, it is soluble in alkali hydroxides or carbonates. This product is insoluble in water, benzene, chloroform and ether.

  4. How should Product 46955, Fluorescein, be stored?

    We recommend storing this product at room temperature.

  5. What is the dye content of Product 46955, Fluorescein?

    According to our supplier, the dye content of pure Fluorescein is a minimum of 90%. We do not test the purity of this product since it is not one of our specifications.

  6. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  7. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  8. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Experimental recovery of intrinsic fluorescence and fluorophore concentration in the presence of hemoglobin: spectral effect of scattering and absorption on fluorescence
Du Le VN, et al.
Journal of Biomedical Optics, 20(12), 127003-127003 (2015)
Testing Fluorescence Lifetime Standards using Two-Photon Excitation and Time-Domain Instrumentation: Fluorescein, Quinine Sulfate and Green Fluorescent Protein
Kristoffersen AS, et al.
Journal of Fluorescence, 28(5), 1065-1073 (2018)
Hirofumi Shoda et al.
Arthritis & rheumatology (Hoboken, N.J.), 67(5), 1171-1181 (2015-03-18)
The balance between effector and regulatory CD4+ T cells plays a key role in the pathogenesis of rheumatoid arthritis (RA). The aim of this study was to examine whether the RA autoantigen BiP has epitopes for both effector and regulatory
Diagnostic agents
Robert-Gnansia E
Drugs During Pregnancy and Lactation, 502-513 (2007)
Microfluidic gut-on-a-chip with three-dimensional villi structure
Shim KY, et al.
Biomedical Microdevices, 19(2), 37-37 (2017)


Fluorescence Quenching Microscopy: Imaging Two-Dimensional Materials

Developed in the last several years, fluorescence quenching microscopy (FQM) has enabled rapid, inexpensive, and high-fidelity visualization of two-dimensional (2D) materials such as graphene-based sheets and MoS2.

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