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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

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.

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

Certificates of Analysis (COA)

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Spectrophotometric high-precision seawater pH determination
for use in underway measuring systems
A?mann S
Ocean Science, 7, 597-607 (2011)
M.-I. Baraton
Sensors for Environment, Health and Security (2008)
Peter J Edmunds et al.
The Journal of experimental biology, 223(Pt 8) (2020-03-18)
Experiments with coral fragments (i.e. nubbins) have shown that net calcification is depressed by elevated PCO2 Evaluating the implications of this finding requires scaling of results from nubbins to colonies, yet the experiments to codify this process have not been

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