Phenolphthalein

Phenolphthalein (CAS 77-09-8) is a well-known pH indicator and a classic laxative agent with a long history of pharmaceutical use. As a triarylmethane compound, it exhibits a distinct color transition from colorless to pink in the pH range of 8.2–10.0, making it a staple in analytical chemistry and titration applications. We supply it as a white to off-white crystalline powder with a purity of 99% min, meeting the requirements for both laboratory and pharmaceutical formulations.

In pharmaceutical contexts, phenolphthalein has been employed as a stimulant laxative, though its use has declined due to safety concerns. Today, it is more commonly found in diagnostic reagents, pH test strips, and as a laboratory standard. Our product is manufactured under controlled conditions, with each batch tested to ensure consistent quality and performance.

Synonyms: 3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone, 3,3-Bis(4-hydroxyphenyl)phthalide, Phenolphthalol, alpha-Dihydroxyphthalophenone

Applications

• pH indicator in titrations and analytical chemistry
• Component in diagnostic test kits and laboratory reagents
• Research and development in chemical synthesis
• Formerly used in laxative formulations (historical use)

Quality & Documentation

Each batch is tested for assay (HPLC ≥99%), loss on drying (≤0.5%), and residue on ignition (≤0.1%). Full COA, MSDS, and TDS are available on request. We can also provide stability data for qualification purposes.

Packaging & Supply

Standard packaging: 25 kg fiber drums, with custom packing available. In-stock items ship within 3–5 days; MOQ is 25 kg. For pricing, samples, and bulk orders, contact our sales team.

Request For Quote

• Our Address: 280 Main Street, Xian, Shaanxi, China
• LyvBio Co., Ltd. — Email: info@lyvbio.com