Description

Bromoxylenol Blue CAS NO 40070-59-5 is a high-purity synthetic dye belonging to the sulfonphthalein class, widely recognized as a sensitive pH indicator and biological stain. Its primary value lies in providing a sharp, visually distinct color transition within a specific pH range, enabling precise endpoint detection in analytical chemistry and life science research. This compound is essential for professionals in industrial quality control laboratories, pharmaceutical R&D, and academic institutions requiring reliable colorimetric analysis.

Application

• pH Indicator in Titrations: Used as a visual endpoint indicator in acid-base titrations within its effective pH transition range.
• Biological Staining: Employed in microbiology and histology for staining cellular components and tissues to enhance contrast under microscopy.
• Analytical Reagent: Serves as a key component in the formulation of test kits and chemical reagents for water analysis and diagnostic assays.
• Research & Development: Utilized in biochemical and pharmaceutical research for monitoring pH changes in enzymatic reactions and fermentation processes.
• Educational Demonstrations: Applied in academic laboratory settings to visually demonstrate principles of pH and acid-base chemistry.
• Dye Intermediate: Acts as a precursor or intermediate in the synthesis of more complex dyes and specialized colorants.

Basic Information

Product Name	Bromoxylenol Blue
CAS No.	40070-59-5
Molecular Formula	C23H20Br2O5S
Molecular Weight	576.27 g/mol
Synonyms	3',3''-Dibromoxylenol Blue; 3',3''-Dibromo-o-cresolsulfonphthalein; Bromoxylenol Blue; Bromoxylenolsulfonphthalein; Xylenol Blue, dibromo derivative; NSC 403697; Dibromoxylenol Blue; Acid Blue 119 (related class)
EINECS	254-764-7

Quality Control

Our Bromoxylenol Blue is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Each lot undergoes comprehensive analytical testing, including identity confirmation by IR spectroscopy, purity assessment by HPLC, and verification of key physical properties. 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, and well-ventilated area at a controlled room temperature (15-25°C). Keep the container tightly sealed when not in use to prevent contamination and moisture absorption.

Specification

Item	Specification
Appearance	Dark green to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
pH Transition Range	Contact for details
Loss on Drying	≤ 2.0 %
Residue on Ignition	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm

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