Description

Ponceau S is a synthetic, water-soluble azo dye widely recognized for its vibrant red color and specific staining properties. This compound is valued for its high purity and consistent performance in critical analytical and diagnostic procedures. It serves as an essential reagent for researchers and quality control professionals in the life sciences, food safety, and histology sectors, where precise colorimetric detection is paramount.

Application

• Protein Staining in Gel Electrophoresis: Commonly used in Bradford and other assays to visualize protein bands on polyacrylamide gels (SDS-PAGE).
• Histological Staining: Employed as a counterstain in tissue sections to provide contrast to other dyes, aiding in microscopic analysis.
• Food Colorant Analysis: Acts as a reference standard and analytical marker for the identification and quantification of synthetic dyes in food products.
• Biochemical Research: Utilized in various laboratory protocols for staining biological materials, including membranes and blots.
• Diagnostic Reagents: A key component in the formulation of certain clinical diagnostic kits and laboratory stains.
• Industrial Dyeing: Used in small-scale or specialized applications for coloring paper, textiles, and inks.

Basic Information

Product Name	Ponceau S
CAS No.	6226-79-5
Molecular Formula	C22H12N4Na4O13S4
Molecular Weight	760.59 g/mol
Synonyms	Acid Red 112; C.I. 27195; Ponceau SX; Ponceau S extra; Brilliant Ponceau 5R; 3-Hydroxy-4-(2-sulfo-4-[4-sulfophenylazo]phenylazo)-2,7-naphthalenedisulfonic acid, tetrasodium salt; 2-Naphthalenesulfonic acid, 7-hydroxy-8-[(4-sulfo-1-naphthalenyl)azo]-, disodium salt; Food Red 1
EINECS	228-299-9

Quality Control

Our Ponceau S is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity suitable for analytical and research applications. Each lot undergoes comprehensive testing, including identity confirmation, assay (purity), and analysis of key impurities. A Certificate of Analysis (COA) detailing all specifications and 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 place at a controlled room temperature (15-25°C). Keep the container tightly sealed when not in use to protect from moisture.

Specification

Item	Specification
Appearance	Dark red to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 85.0% (Dye content)
Loss on Drying	≤ 10.0 %
Water Solubility	Freely soluble
Absorbance (λ max)	518 - 526 nm

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