Description

Indigodisulfonate Dipotassium Salt is a high-purity, water-soluble salt of indigotindisulfonic acid, valued for its distinct blue color and chemical stability. This compound serves as a critical analytical reagent and colorimetric indicator in various scientific and industrial processes. It is primarily utilized by professionals in the pharmaceutical, analytical chemistry, and diagnostic reagent manufacturing sectors.

Application

• Analytical Chemistry: Used as a redox indicator in titrations, particularly in iodometric and cerimetric assays.
• Pharmaceutical Testing: Employed as a colorimetric reagent in official methods for drug purity and content analysis.
• Diagnostic Reagents: A key component in the formulation of clinical chemistry test kits and biological stains.
• Research & Development: Serves as a model compound or standard in photochemical and spectroscopic studies.
• Dye Intermediate: Acts as a precursor or intermediate in the synthesis of specialized dyes and pigments.
• Food & Cosmetic Colorant Analysis: Used as a reference standard in the identification and quantification of synthetic colorants.

Basic Information

Product Name	Indigodisulfonate Dipotassium Salt
CAS No.	13725-33-2
Molecular Formula	C16H8K2N2O8S2
Molecular Weight	498.58 g/mol
Synonyms	Indigo Carmine Dipotassium Salt; Indigotindisulfonate Dipotassium Salt; FD&C Blue No. 2; Acid Blue 74; E132; C.I. 73015; 5,5'-Indigodisulfonic Acid Dipotassium Salt; Indigo-5,5'-disulfonic Acid Dipotassium Salt
EINECS	237-306-3

Quality Control

Our Indigodisulfonate Dipotassium Salt is manufactured under a strict quality management system. Each batch is tested to ensure it meets high-purity standards suitable for analytical and reagent applications. A comprehensive Certificate of Analysis (COA), detailing parameters such as assay, identification, and impurity profiles, is provided with every shipment to guarantee traceability and consistency.

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	Blue to dark blue powder or crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Residue on Ignition (Sulfated Ash)	28.0% - 32.0%
Water Solubility	Clear, blue solution
Heavy Metals (as Pb)	≤ 20 ppm

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