Description

o-Cresolphthalein Complexone Disodium Salt is a high-purity, water-soluble organic reagent that functions as a highly selective chromogenic indicator for calcium ions. Its primary value lies in its ability to form a stable, intensely colored complex with calcium, enabling precise quantitative analysis in aqueous solutions. This compound is essential for clinical diagnostics, water treatment analysis, and industrial process control where accurate calcium determination is critical for quality and safety.

Application

• Clinical Diagnostics: Key reagent in colorimetric assay kits for the quantitative determination of calcium in serum, plasma, and urine, vital for diagnosing and monitoring bone and metabolic disorders.
• Water Quality Analysis: Used for measuring water hardness (calcium concentration) in potable water, industrial boiler water, and wastewater treatment processes.
• Food & Beverage Testing: Employed in the analysis of calcium content in dairy products, fortified foods, and beverages to ensure nutritional labeling accuracy and quality control.
• Pharmaceutical Manufacturing: Serves as a critical component in the quality control of raw materials and finished products where calcium levels must be strictly controlled.
• Research & Development: Utilized in biochemical and physiological research studies involving calcium signaling, enzyme kinetics, and mineral metabolism.
• Industrial Process Control: Applied in monitoring calcium scales and deposits in cooling systems, desalination plants, and other industrial water circuits.

Basic Information

Product Name	o-Cresolphthalein Complexone Disodium Salt
CAS No.	94442-10-1
Molecular Formula	C32H30N2O12Na2
Molecular Weight	664.57 g/mol
Synonyms	o-Cresolphthalein Complexone, Disodium Salt; CPC Disodium Salt; 3',3''-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolphthalein Disodium Salt; Phthalein Purple, Disodium Salt; o-Cresolphthalein-3',3''-bis(methyliminodiacetic acid) Disodium Salt; Calcium Colorimetric Assay Reagent; o-CPC Na2; NSC 113992
EINECS	Contact for details

Quality Control

Our o-Cresolphthalein Complexone Disodium 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 diagnostic and analytical applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and performance in calcium binding is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at 15-25°C. This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed in a low-humidity environment to prevent degradation and maintain performance.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Calcium Complex Absorbance	Conforms to reference
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Clear, colorless solution

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