857890

m-Cresol Purple

indicator grade, Dye content 90 %

• Synonym(s): m-Cresolsulfonphthalein
• Empirical Formula (Hill Notation): C₂₁H₁₈O₅S
• CAS Number: 2303-01-7
• Molecular Weight: 382.43
• Beilstein/REAXYS Number: 350314
• EC Number: 218-960-6
• MDL number: MFCD00005871
• UNSPSC Code: 12171500
• PubChem Substance ID: 24888455
• NACRES: NA.47

Properties

• grade: indicator grade
• Quality Level: 200
• form: powder
• composition: Dye content, 90%
• technique(s): titration: suitable
• useful pH range: 1.2-2.8, red to yellow(acid); 7.4-9.0, yellow to violet(alkaline)
• ε (extinction coefficient): ≥ 11000 at 295-301 nm at 0.01 g/L (0.01 G/L in 0.005 N NAOH in Methanol); ≥26000 at 578-584 nm at 0.01 g/L (in 0.005 N NAOH in Methanol); ≥8000 at 369-375 nm at 0.01 g/L (in 0.005 N NAOH in Methanol)
• application(s): diagnostic assay manufacturing; hematology; histology
• storage temp.: room temp
• SMILES string: Cc1cc(O)ccc1\C(=C2/C=CC(=O)C=C2C)c3ccccc3S(O)(=O)=O
• InChI: 1S/C21H18O5S/c1-13-11-15(22)7-9-17(13)21(18-10-8-16(23)12-14(18)2)19-5-3-4-6-20(19)27(24,25)26-21/h3-12,22-23H,1-2H3
• InChI key: OLQIKGSZDTXODA-UHFFFAOYSA-N

Description

General description

m-Cresol Purple (meta Cresol Purple) is a sulfonephthalein dye. It is also known as m-Cresolsulfonphthalein.

Application

m-Cresol purple has been used to measure pH via spectrophotometer.

Biochem/physiol Actions

m-Cresol purple is a pH indicator. It changes from red (pH 1.2) to yellow (2.8) and yellow (7.4) to purple (9.0).

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable