Description

m-Cresol Purple, Sodium Salt is a high-purity, water-soluble derivative of m-cresol purple, widely recognized as a sensitive pH indicator and biological stain. This compound is essential for precise analytical and diagnostic procedures, offering reliable colorimetric endpoints in critical applications. It is primarily utilized by research laboratories, diagnostic kit manufacturers, and quality control departments in the pharmaceutical and biotechnology sectors.

Application

• pH Indicator in microbiological culture media and various analytical chemistry procedures.
• Biological Staining agent for microscopy and histology applications.
• Endpoint Detection in titration experiments and diagnostic assays.
• Research Reagent in biochemistry and molecular biology for buffer preparation and reaction monitoring.
• Quality Control Testing in pharmaceutical manufacturing for purity and identity verification.
• Component in Prepared Media and diagnostic kits for clinical and environmental testing.

Basic Information

Item	Detail
Product Name	m-Cresol Purple, Sodium Salt
CAS No.	62625-31-4
Molecular Formula	C21H15NaO5S
Molecular Weight	402.39 g/mol
Synonyms	m-Cresolsulfonphthalein, Sodium Salt; 3',3''-Dimethylphenolsulfonphthalein, Sodium Salt; Cresol Purple Sodium Salt; m-Cresol Purple Na Salt; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2-methylphenol) S,S-Dioxide, Sodium Salt; Meta-Cresol Purple Sodium Salt; Acid-base Indicator m-Cresol Purple
EINECS	Contact for details

Quality Control

Our m-Cresol Purple, Sodium Salt is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including identification, purity assay, and impurity profiling, to ensure it meets the high standards required for research and diagnostic use. A Certificate of Analysis (COA) detailing all test results is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is sealed tightly after each use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark green to brownish-green powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
pH Transition Range	1.2 (red) to 2.8 (yellow); 7.4 (yellow) to 9.0 (purple)
Solubility	Soluble in water, ethanol
Heavy Metals	≤ 20 ppm

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