Description

Bromocresol Green is a high-purity synthetic triphenylmethane dye widely used as a pH indicator in analytical chemistry. Its distinct color transition from yellow to blue-green across a pH range of 3.8 to 5.4 makes it an indispensable tool for precise endpoint detection in titrations and biological assays. This compound is essential for professionals in pharmaceutical quality control, clinical diagnostics, and chemical research laboratories requiring reliable and consistent visual indicators.

Application

• pH Indicator in Titrations: Primarily used in acid-base titrations for visual endpoint determination, especially in non-aqueous media.
• Clinical Diagnostics: Employed as a colorimetric reagent in various diagnostic kits and tests for analyzing serum albumin and other biochemical parameters.
• Microbiological Media: Incorporated into culture media as a pH indicator to monitor microbial growth and metabolic activity.
• Analytical Chemistry Reagent: Serves as a key component in buffer solutions and as a stain in electrophoresis and chromatography for visualization.
• Research & Development: Utilized in biochemical and pharmaceutical R&D for enzyme assays, protein studies, and metabolic pathway analysis.
• Educational Laboratories: A standard reagent in university and teaching labs for demonstrating principles of acid-base chemistry and spectrophotometry.

Basic Information

Product Name	Bromocresol Green
CAS No.	76-60-8
Molecular Formula	C21H14Br4O5S
Molecular Weight	698.01 g/mol
Synonyms	3',3'',5',5''-Tetrabromo-m-cresolsulfonphthalein; Bromcresol Green; BCG; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis[2,6-dibromo-3-methylphenol] S,S-dioxide; NSC 7570; C.I. 42090; Acid Green 22; Bromocresol Green Sodium Salt (for salt form)
EINECS	200-972-8

Quality Control

Our Bromocresol Green is manufactured under a strict quality management system. Each batch is tested to ensure it meets high-purity standards suitable for analytical and diagnostic applications. We provide comprehensive Certificates of Analysis (COA) detailing purity, identity, and performance characteristics. The product can be supplied to meet various pharmacopeial standards (e.g., USP, EP) upon request, ensuring reliability and consistency for critical laboratory work.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain stability and performance.

Specification

Item	Specification
Appearance	Light tan to brownish-green powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
pH Transition Range	3.8 (yellow) to 5.4 (blue-green)
Loss on Drying	≤ 2.0 %
Residue on Ignition (Sulfated Ash)	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Ethanol)	Clear, green solution

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