1.15934

Eosin B (bluish) (C.I.45400)

for microscopy Certistain^®

• Synonym(s): Eosin B (bluish) (C.I.45400), Dibromodinitrofluorescein sodium
• Empirical Formula (Hill Notation): C₂₀H₆Br₂N₂Na₂O₉
• CAS Number: 548-24-3
• Molecular Weight: 624.06
• MDL number: MFCD00005041
• UNSPSC Code: 41116130
• EC Index Number: 208-943-1

Properties

• Quality Level: 400
• form: solid
• composition: Dye, ≥85% spectrophotometric assay
• pH: 6.2 (25 °C, 10 g/L in H₂O)
• solubility: 300 g/L
• bulk density: 680 kg/m³
• εmax: 800-1000 at 517-525 nm in water at 0.005 g/L
• application(s): diagnostic assay manufacturing; hematology; histology
• storage temp.: 2-30°C
• InChI: 1S/C20H8Br2N2O9.2Na/c21-14-16(25)11(23(29)30)5-9-13(7-3-1-2-4-8(7)20(27)28)10-6-12(24(31)32)17(26)15(22)19(10)33-18(9)14;;/h1-6,25H,(H,27,28);;/q;2*+1/p-2
• InChI key: GYYTYUGGVBYJHE-UHFFFAOYSA-L

Description

General description

Eosin B (C.I. 45400) for microscopy Certistain^®, is a dry dye for microscopy that is often used as a counterstain, vizualising proteins, connective tissues, fibers and keratin in sample material of human origin. Depending on user requirements and personal preferences, it can be used for the preparation of the commonly used aqueous or alcoholic Eosin B staining solutions. This staining solution will mostly be used for routine staining in the hematoxylin-eosin staining process (H&E). The H&E staining process is the most frequently used staining method for histological material. Due to the hematoxylin solution, the nuclei will appear dark blue to dark violet in color and the Eosin Y solution will stain the cytoplasma and intercellular substances pink to red. As the dye belongs to the portfolio of Certistain^® dyes, it is chemically analyzed according to strict specifications before release (CE marked and IVD product) and a high staining quality, with reliable staining results is guaranteed. For more details, please see instructions for use (IFU). The IFU can be downloaded from this webpage.

Analysis Note

Dye content (gravimetrically): ≥ 85 %
Identity
- sodium:
passes test
- UV/VIS-Spectrum: passes test
Absorption maximum λ max (water): 517 - 525 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.005 g/l; water): 800 - 1000
TLC-Test: passes test
Loss on drying (110 °C): ≤ 8 %
Suitability for microscopy: passes test

Legal Information

CERTISTAIN is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_c: Not applicable