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211761

Sigma-Aldrich

m-Cresol Purple sodium salt

Dye content 90 %

Synonym(s):

m-Cresolsulfonphthalein sodium salt

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About This Item

Empirical Formula (Hill Notation):
C21H17NaO5S
CAS Number:
62625-31-4
Molecular Weight:
404.41
EC Number:
263-656-9
MDL number:
MFCD00010177
UNSPSC Code:
12171500
PubChem Substance ID:
24852706
NACRES:
NA.47

form

powder

Quality Level

200

composition

Dye content, 90%

color

black

λmax

579 nm

ε (extinction coefficient)

≥15000 at 433-439 nm in H2O at 0.008 g/L

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

[Na+].Cc1cc(O)ccc1\C(=C2\C=CC(=O)C=C2C)c3ccccc3S([O-])(=O)=O

InChI

1S/C21H18O5S.Na/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;/h3-12,22H,1-2H3,(H,24,25,26);/q;+1/p-1/b21-18+;

InChI key

BYQJYOOKENJSNK-GOSREXKOSA-M

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General description

m-cresol purple sodium salt (MCP) is a colorimetric pH indicator dye. The dye is blue in anionic form and yellow in protonated form.

Application

m-Cresol Purple sodium salt has been used to measure pH of seawater using a spectrophotometer.

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Spectrophotometric high-precision seawater pH determination
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A?mann S
Ocean Science, 7, 597-607 (2011)
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