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M8256

Sigma-Aldrich

Methyl Red sodium salt

Crystalline

Synonym(s):

4-Dimethylaminoazobenzene-2′-carboxylic acid sodium salt, Acid Red 2

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About This Item

Empirical Formula (Hill Notation):
C15H14N3NaO2
CAS Number:
845-10-3
Molecular Weight:
291.28
Colour Index Number:
13020
Beilstein/REAXYS Number:
4065488
EC Number:
212-682-9
MDL number:
MFCD00002426
UNSPSC Code:
12171500
PubChem Substance ID:
24897234

agency

suitable for SM 2310
suitable for SM 2320

Quality Level

200

form

powder

technique(s)

titration: suitable

visual transition interval

4.2-6.2, pink to yellow

solubility

soluble, clear, orange

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

[Na+].CN(C)c1ccc(cc1)\N=N\c2ccccc2C([O-])=O

InChI

1S/C15H15N3O2.Na/c1-18(2)12-9-7-11(8-10-12)16-17-14-6-4-3-5-13(14)15(19)20;/h3-10H,1-2H3,(H,19,20);/q;+1/p-1/b17-16+;

InChI key

GNTPCYMJCJNRQB-CMBBICFISA-M

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General description

Methyl Red is an azo dye that indicates the presence of acid in the culture medium, which is formed due to fermentation of sugar by bacteria. This red dye is reduced to orange color in the presence of acid. Methyl Red has been used as a part of IMViC (indole, methyl red, Voges-Proskauer and citrate utilization or catalase production test). IMViC is a biochemical test performed to differentiate among the coliforms, specifically Escherichia coli and Enterobacter aerogene.
Methyl red sodium salt is the sodium salt of methyl red synthetic dye, which belongs to the azo group of dyes.

Application

Methyl red sodium salt is primarily used in microbiology in order to identify bacteria such as Enterobacter agglomerans in dye-contaminated sludge.

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)

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Panizza M and Cerisola G
Applied Catalysis. B, Environmental, 75(1-2), 95-101 (2007)
A review on commonly used biochemical test for bacteria.
Hemraj V, et al.
Innovare journal of life science, 1(1), 1-7 (2013)
Bacterial decolorization of the azo dye methyl red by Enterobacter agglomerans.
Moutaouakkil A, et al.
Annals of Microbiology, 53(2), 161-170 (2003)
Oana Alexandru et al.
Journal of neuro-oncology, 102(1), 9-18 (2010-07-17)
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