Description

Cresol Red Sodium Salt is a high-purity, water-soluble indicator dye widely used in analytical chemistry and life sciences. Its primary value lies in its distinct color change within a specific pH range, making it an essential tool for precise endpoint detection in titrations and as a pH indicator in biological culture media. This product is critical for professionals in pharmaceutical quality control, biotechnology research, and industrial chemical analysis who require reliable and consistent performance from their reagents.

Application

• pH Indicator in Titrations: Used as a visual endpoint indicator in acid-base titrations, particularly in non-aqueous media.
• Microbiological Culture Media: Incorporated as a pH indicator in various agar and broth formulations to monitor microbial metabolism and growth conditions.
• Biochemical Research & Diagnostics: Employed in buffer solutions and assay kits for enzymatic studies and diagnostic tests.
• Analytical Chemistry Reagent: Serves as a key component in standardized test methods and laboratory protocols requiring precise pH monitoring.
• Dye for Staining & Visualization: Used in specific histological and cytological staining procedures.
• Educational & Laboratory Use: A standard reagent in academic and industrial teaching laboratories for chemistry and biology experiments.

Basic Information

Product Name	Cresol Red Sodium Salt
CAS No.	62625-29-0
Molecular Formula	C21H15NaO5S
Molecular Weight	402.39 g/mol
Synonyms	Cresolsulfonephthalein Sodium Salt; o-Cresolsulfonphthalein Sodium Salt; Cresol Red, Sodium Salt; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2-methylphenol) S,S-Dioxide Sodium Salt; 3',3''-Bis(methylphenolsulfonephthalein) Sodium Salt; Cresol Red Na; Sodium Cresol Red; Cresol Red Indicator
EINECS	263-668-4

Quality Control

Our Cresol Red Sodium Salt is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation (IR), to ensure it meets the high standards required for critical laboratory applications. A comprehensive Certificate of Analysis (COA) detailing assay, loss on drying, and specific absorbance is provided with every shipment.

Storage

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

Specification

Item	Specification
Appearance	Dark red to reddish-brown powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0 %
pH Transition Range	7.2 (yellow) to 8.8 (red)
Specific Absorbance	Conforms to reference standard
Solubility (Water)	Freely soluble

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