Description

Methyl Eosin CAS NO 23391-49-3 is a synthetic xanthene dye, a methylated derivative of eosin, known for its distinct red fluorescence under specific conditions. This compound is valued for its role as a versatile biological stain and a critical component in specialized diagnostic and research applications. It is primarily sought by professionals in the life sciences, histology, and industrial sectors for its reliable performance in staining protocols and as a tracer dye.

Application

• Histological Staining: Used as a counterstain in combination with other dyes to provide contrast and highlight specific cellular structures in tissue samples.
• Fluorescence Microscopy: Employed as a fluorescent probe in biological research for visualizing and tracking cellular components.
• Diagnostic Reagents: A key ingredient in the formulation of specific stains and reagents used in clinical and veterinary diagnostic kits.
• Industrial Tracer Dye: Functions as a colorant and fluorescent marker in non-biological applications, such as in certain inks or fluid tracking systems.
• Photographic Sensitizer: Historically used in photographic processes due to its light-sensitive properties.
• Research & Development: Serves as a standard or reagent in chemical and biochemical research laboratories for method development and validation.

Basic Information

Product Name	Methyl Eosin
CAS No.	23391-49-3
Molecular Formula	C21H9Br4O5
Molecular Weight	691.81 g/mol
Synonyms	Eosin Methyl; Eosin B; Eosin Scarlet; Acid Red 91; C.I. 45380; Bromoeosin; 2',4',5',7'-Tetrabromo-3',6'-dihydroxy-3H-spiro[isobenzofuran-1,9'-xanthen]-3-one, methyl ester; Eosin Y, methyl ester
EINECS	Contact for details

Quality Control

Our Methyl Eosin is produced and tested under a rigorous quality management system to ensure batch-to-batch consistency and high purity. Each lot is analyzed against stringent in-house specifications, which typically include identity confirmation, purity assay, and control of key impurities. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, minimize exposure to direct light during handling and storage.

Specification

Item	Specification
Appearance	Red to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 1.0%
Heavy Metals	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.