Eosin Y (yellowish) solution 10%

Supplier: MP Biomedicals

Synonyms: Solvent Red 43, Field's Stain B, Eosin 225, 2,4,5,7-Tetrabromofluorescein disodium salt, Disodium 2-(2,4,5,7-tetrabromo-6-oxido-3-oxoxanthen-9-yl)benzoate, Disodium 2',4',5',7'-tetrabromo-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-3',6'-bis(olate), Tetrabromofluorescein disodium salt, 2′,4′,5′,7′-Tetrabromofluorescein disodium salt, Eosin Y disodium salt

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ICNA02195700.5EA 66.3 EUR
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Eosin Y (yellowish) solution 10%
Eosin Y (yellowish)

Eosin Y disodium salt is used in combination with Azure II to show morphological details of marrow cells; buffered Azure A/Eosin Y method for demostrating cell granules, microorganisms and nuclei; for showing insect musculature; for demonstrating cells infected with mosquito-iridescent virus; use in combination with Alum Hematoxylin/Azure II to show mast cells, early necrobiotic changes in cells and protozoans, rickettsias and bacteria in tissues; to demonstrate volutin granules in any microorganism; Bond's modification of Mann's Eosin-Methyl Blue for Negri bodies in smears; Harris stain for Negri bodies in smears; Mann's method for staining Negri bodies in sections; Gridley's stain for Endamoeba in tissue sections; a modified methenamine-silver nitrate method for the demonstration of Endamoeba in sections. It is used as a counterstain for hematoxylin.


Eosin Y, a red xanthene dye, has been noted to reduce the affinity of Mg2+- ATPase for ATP and increase the enzyme affinity for Mg2+ at concentrations of 10-50 μM. At higher concentrations near 100 μM the affinity for Mg2+- ATPase for the ion-activator has been shown to be reduced. This compound has also been reported to be a photosensitizer that works as a molecular photoelectrode via catalyzation of the visible-light-driven electron-transfer reaction. This agent also enhances fluorescent quenching abilities by forming a complex with polyvinulpyrrolidone.

Formula: C₂₀H₆Br₄Na₂O₅
MW: 691,86 g/mol
Density: 1,015 g/mL (25 °C) (lit.)
Storage Temperature: Ambient
MDL Number: MFCD00005040
CAS Number: 17372-87-1

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