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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:
Molecular Weight:
382.43
Beilstein:
350314
EC Number:
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:
NACRES:
NA.47

grade

indicator grade

Quality Level

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).

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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Relative sensitivity of five Hawaiian coral species to high temperature under high-pCO2 conditions.
Bahr KD, et al.
Coral Reefs, 35, 729-738 (2016)
Seasonal and annual calcification rates of the Hawaiian reef coral, Montipora capitata, under present and future climate change scenarios.
Bahr KD, et al.
ICES Journal of Marine Science, fsw078-fsw078 (2016)
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
M D Johnston et al.
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
A Noto et al.
Clinical chemistry, 29(10), 1713-1716 (1983-10-01)
We have developed a new spectrophotometric assay for urinary N-acetyl-beta-D-glucosaminidase (NAGase) with use of sodio m-cresolsulfonphthaleinyl N-acetyl-beta-D-glucosaminide (MCP-NAG). MCP-NAG was synthesized from acetochloro-glucosamine and m-cresolsulfonphthalein (MCP) in four steps. MCP-NAG reacts well with NAGase (Km = 0.41 mmol/L) and is

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