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857890

Sigma-Aldrich

m-Cresol Purple

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
Beilstein/REAXYS Number:
350314
EC Number:
218-960-6
MDL number:
MFCD00005871
UNSPSC Code:
12171500
PubChem Substance ID:
24888455
NACRES:
NA.47

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

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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).

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

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Journal of applied microbiology, 94(6), 1015-1023 (2003-05-20)
To examine the effect on the leakage of low molecular weight cytoplasmic constituents from Staphylococcus aureus using phenolics singly and in combination, and to see if the observations could be modelled using a non-linear dose response. The rate of potassium
Ali A Ensafi et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 60(8-9), 2053-2057 (2004-07-14)
A new flow-injection method is reported for the determination of bromide. The method is based on catalytic effect of bromide on the oxidation of m-cresolsulfonephthalein by periodate in acidic media. The reaction was followed spectrophotometrically by measuring the decrease in
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