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Sigma-Aldrich

m-Cresol Purple sodium salt

Dye content 90 %

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Synonym(s):
m-Cresolsulfonphthalein sodium salt
Empirical Formula (Hill Notation):
C21H17NaO5S
CAS Number:
Molecular Weight:
404.41
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

form

powder

composition

Dye content, 90%

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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This Item
860891857890B5880
m-Cresol Purple indicator grade, Dye content 90 %

Sigma-Aldrich

857890

m-Cresol Purple

Bromocresol Purple Technical grade

Sigma-Aldrich

B5880

Bromocresol Purple

composition

Dye content, 90%

composition

Dye content, 90%

composition

Dye content, 90%

composition

-

λmax

579 nm

λmax

379 nm, 585 nm (2nd)

λmax

371 nm (2nd), 579 nm

λmax

-

ε (extinction coefficient)

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

ε (extinction coefficient)

≥47000 at 587-591 nm in 0.1 M NaOH, ≥7000 at 375-381 nm in 0.1 M NaOH

ε (extinction coefficient)

-

ε (extinction coefficient)

-

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

storage temp.

room temp

storage temp.

room temp

storage temp.

room temp

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

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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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