Description

Bromophenol Blue CAS NO 115-39-9 is a triphenylmethane dye widely recognized as a versatile pH indicator and biological stain. Its distinct color transition from yellow to blue across a pH range of 3.0 to 4.6 makes it an indispensable tool for analytical and diagnostic procedures. This high-purity compound is essential for manufacturers and research laboratories in the pharmaceutical, biotechnology, and chemical analysis sectors.

Application

• pH Indicator: Used in analytical chemistry, microbiology media, and titration procedures to visually determine endpoint pH.
• Gel Electrophoresis: Serves as a common tracking dye in agarose and polyacrylamide gel electrophoresis (PAGE) for nucleic acid and protein separation.
• Biological Staining: Employed as a histological stain to visualize tissues and cellular structures under a microscope.
• Diagnostic Reagents: A key component in the formulation of test strips and kits for clinical and laboratory diagnostics.
• Dye Intermediate: Acts as a precursor or colorant in the synthesis of other specialized dyes and pigments.
• Research & Development: Utilized in biochemical assays and experimental protocols in academic and industrial R&D settings.

Basic Information

Product Name	Bromophenol Blue
CAS No.	115-39-9
Molecular Formula	C19H10Br4O5S
Molecular Weight	669.96 g/mol
Synonyms	3',3'',5',5''-Tetrabromophenolsulfonephthalein; Bromphenol Blue; Tetrabromophenol Blue; BPB; Acid Blue; α-Naphthol Blue; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis[2,6-dibromophenol] S,S-dioxide
EINECS	204-086-2

Quality Control

Our Bromophenol Blue is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for sensitive applications. Certificates of Analysis (COA) detailing all test results are provided and available upon request 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 room temperature (15-25°C). Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark Pink to Brownish Powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
pH Transition Range	3.0 (Yellow) to 4.6 (Blue)
Loss on Drying	≤ 2.0 %
Residue on Ignition	≤ 0.5 %
Solubility	Soluble in Alkali, Slightly soluble in Ethanol

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