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Phloxine B (Acid Red 92) Chemical Structure

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What is Phloxine B (Acid Red 92)?

Phloxine B, often known as phloxine, is a red, water-soluble dye. It is produced from fluorescein, but it is distinct in that it has four bromine atoms in positions 2, 4, 5, and 7 of the xanthene ring and four chlorine atoms in the carboxyphenyl ring. It has an absorption maximum around 540 nm and an emission maximum around 564 nm.

Macsen Laboratories is the leading manufacturer and supplier of Phloxine B (Acid Red 92) with ISO certification.
Name of Product Phloxine B (Acid Red 92)
IUPAC Name disodium;2',4',5',7'-tetrabromo-4,5,6,7-tetrachloro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate
Synonyms Cyanosin; Cyanosine; Eosine bluish; Eosine Blue; Cyanosin B; Eosin Blue; Phloxine P; Phloxin B; Eosine I Bluish; Acid red 92; C.I. 45410; D & C Red no. 28
CAS No 18472-87-2
Molecular Formula C20H2Br4Cl4Na2O5
Molecular Weight 829.6 g/mol
Pubchem CID 6433718


SR. No Criteria Limit/Specification
1 Appearance (Color) Dark Red
2 Appearance (Form) Powder
3 Solubility (Color) Red
4 Solubility (Turbidity) Conforms to requirements
C=1mg/ml; Water
5 Infrared spectrum Conforms to Structure
6 Absorptivity (A1%, 1CM In 50% Ethanol At 548) 1150- 1300
7 Lambda Max 546 -550 nm



Biological Stains | Classification, Examples & Uses

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