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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 Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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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M.-I. Baraton
Sensors for Environment, Health and Security (2008)
Spectrophotometric high-precision seawater pH determination
for use in underway measuring systems
A?mann S
Ocean Science, 7, 597-607 (2011)
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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