m-Cresol Purple

Description

CAS: 2303-01-7 | C21H18O5S | 382.43 g/mol

m-Cresol Purple acts as a pH indicator dye. It plays an important role in spectrophotometric pH measurements. It operates in the pH ranges 1.2 - 2.8 (red to yellow) and 7.4 - 9.0 (yellow to violet). Further, it is employed to stain epithelial cells and proteins.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

Applications
m-Cresol Purple acts as a pH indicator dye. It plays an important role in spectrophotometric pH measurements. It operates in the pH ranges 1.2 - 2.8 (red to yellow) and 7.4 - 9.0 (yellow to violet). Further, it is employed to stain epithelial cells and proteins.

Solubility
Soluble in water and sodium hydroxide solution. Slightly soluble in alcohol.

Notes
Transition interval (acid): pH 1.2 (red) to pH 2.8 (yellow); (alkaline) pH 7.4 (yellow) to pH 9.0 (purple)Incompatible with strong oxidizing agents.

Specifications

Chemical Identifiers

• CAS: 2303-01-7
• Molecular Formula: C21H18O5S
• Molecular Weight (g/mol): 382.43
• MDL Number: MFCD00005871
• InChI Key: OLQIKGSZDTXODA-UHFFFAOYSA-N
• Synonym: m-Cresolsulfonephthalein
• PubChem CID: 73030
• IUPAC Name: 4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,1$l^{6}-benzoxathiol-3-yl]-3-methylphenol
• SMILES: CC1=C(C=CC(=C1)O)C2(C3=CC=CC=C3S(=O)(=O)O2)C4=C(C=C(C=C4)O)C

• Beilstein: 350314
• Merck Index: 14,2577
• Solubility Information: Soluble in water and sodium hydroxide solution. Slightly soluble in alcohol.
• Formula Weight: 382.44
• Quantity: 5 g
• Chemical Name or Material: m-Cresol Purple

Safety and Handling

EINECSNumber	218-960-6
TSCA	Yes
Recommended Storage	Ambient temperatures

SDS

RUO – Research Use Only