Description

Phenolphthalein Disulfate Tripotassium Salt Trihydrate is a high-purity, water-soluble salt derivative of phenolphthalein, a classic acid-base indicator. This compound matters for its enhanced stability and solubility in aqueous systems compared to the free acid form, making it a critical reagent in analytical chemistry and diagnostic applications. It is primarily needed by manufacturers and research laboratories in the pharmaceutical, biotechnology, and clinical diagnostics sectors for precise pH determination and enzymatic assay development.

Application

• Clinical Diagnostic Kits: A key chromogenic substrate in enzymatic assays for clinical chemistry analyzers.
• Biochemical Research: Used as a sensitive pH indicator in cell culture media and buffer solutions.
• Pharmaceutical Quality Control: Employed in titration procedures and as an endpoint indicator for purity testing.
• Educational & Laboratory Reagents: Formulated into standardized solutions for teaching and routine laboratory pH testing.
• Microbiology: Incorporated into selective media for microbial identification based on metabolic acid production.
• Industrial Process Monitoring: Serves as an indicator in chemical manufacturing processes requiring precise pH control.

Basic Information

Product Name	Phenolphthalein Disulfate Tripotassium Salt Trihydrate
CAS No.	10059-42-4
Molecular Formula	C20H12K6O16S2 • 3H2O
Molecular Weight	872.99 g/mol (Trihydrate)
Synonyms	Phenolphthalein Diphosphate Tripotassium Salt (common misnomer); Phenolphthalein-3',3''-bis(tripotassium sulfonate) Trihydrate; Tripotassium Phenolphthalein Disulfonate Trihydrate; Phenolphthalein Disulfonic Acid Tripotassium Salt; PSP Salt; PSP Tripotassium; Phenolsulfonphthalein Tripotassium Salt; Diagnostic Grade Phenolphthalein Sulfonate
EINECS	Contact for details

Quality Control

Our Phenolphthalein Disulfate Tripotassium Salt Trihydrate is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via IR spectroscopy, to ensure it meets the stringent requirements for diagnostic and research applications. Certificates of Analysis (COA) with lot-specific data are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is sealed immediately after use to prevent absorption of atmospheric moisture, which can affect performance and stability.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0% (on anhydrous basis)
Water Content (KF)	5.0 - 7.0% (Theoretical for Trihydrate: ~6.2%)
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, colorless solution

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