Eosin B for microscopy, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY

Synonyms: Eosin bluish, 2,7-Dinitro-4,5-dibromofluorescein, Eosin B disodium salt, Sodium 2-(4,5-dibromo-2,7-dinitro-6-oxido-3-oxo-3H-xanthen-9-yl)benzoate, 2-(4,5-dibromo-3,6-dihydroxy-2,7-dinitroxanthen-9-yl)-benzoic acid disodium salt, Acid Red 91

M-Clarity™ quality level = MQ100

45260-100G-F 45260-25G-F
45260-100G-FEA 269 GBP
45260-100G-F 45260-25G-F
Eosin B for microscopy, Sigma-Aldrich®
Eosin B
Formula: C₂₀H₆Br₂N₂Na₂O₉
MW: 624,06 g/mol
Melting Pt: > 310 °C
Storage Temperature: Ambient
MDL Number: MFCD00005041
CAS Number: 548-24-3
EINECS: 208-943-1
Merck Index: 12,03638
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Specification Test Results

Appearance (colour) Green to very dark green and brown to very dark brown and green-brown and brown-green
Appearance (form) Powder
Assay (gravimetr.) ≥ 80.0 %
Thin layer chromatography Corresponds to standard
Solubility (color) Red to very dark red
Solubility (method) 0.01 g in 10ml water
Loss on drying ≤ 7.0 %
Infrared spectrum Conforms to structure
Wavelength (1) (uv) 509 - 524 nm
Extinction (1%/1cm) (1) (uv) ≥ 600
Solvent (uv) Water + 1ml 1% sodium carbonate
Lead (Pb) by Element analysis Not detected
Zinc (Zn) by Element analysis Not detected

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