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857890

m-Cresol Purple

Name: <I>m</I>-Cresol Purple
Brand: SIAL

indicator grade, Dye content 90 %

Synonym(s):

m-Cresolsulfonphthalein

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About This Item

Empirical Formula (Hill Notation):

C₂₁H₁₈O₅S

CAS Number:

2303-01-7

Molecular Weight:

382.43

UNSPSC Code:

12171500

NACRES:

NA.47

PubChem Substance ID:

24888455

EC Number:

218-960-6

Beilstein/REAXYS Number:

350314

MDL number:

MFCD00005871

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Properties

grade

indicator grade

Quality Segment

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).

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Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c