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250198

Sigma-Aldrich

Methyl Red

ACS reagent, crystalline

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Synonym(s):
2-(4-Dimethylaminophenylazo)benzoic acid, 4-Dimethylaminoazobenzene-2′-carboxylic acid, Acid Red 2
Linear Formula:
(CH3)2NC6H4N=NC6H4CO2H
CAS Number:
Molecular Weight:
269.30
Colour Index Number:
13020
Beilstein/REAXYS Number:
750102
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

grade

ACS reagent

Quality Level

form

crystalline

technique(s)

titration: suitable

visual transition interval

4.2-6.2, pink to yellow

mp

179-182 °C (lit.)

solubility

ethanol: 1 mg/mL

λmax

410 nm

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

CN(C)c1ccc(cc1)\N=N\c2ccccc2C(O)=O

InChI

1S/C15H15N3O2/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)/b17-16+

InChI key

CEQFOVLGLXCDCX-WUKNDPDISA-N

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This Item
114502861235M8256
vibrant-m

250198

Methyl Red

vibrant-m

114502

Methyl Red sodium salt

vibrant-m

861235

Methyl Red hydrochloride

vibrant-m

M8256

Methyl Red sodium salt

grade

ACS reagent

grade

ACS reagent

grade

ACS reagent

grade

-

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

form

crystalline

form

powder

form

powder or crystals

form

powder

solubility

ethanol: 1 mg/mL

solubility

water: 0.1%

solubility

ethanol: 0.1%

solubility

soluble, clear, orange

λmax

410 nm

λmax

437 nm

λmax

493 nm

λmax

-

Application

Methyl Red has been used as pH indicator in a glucose biosensor, which is used for salivary analysis.

Biochem/physiol Actions

Methyl Red is a maroon red crystal azo dye. Methyl Red is a pH indicator and changes color at a pH of 5.5. Methyl Red is widely used in saliva sampling method. In addition, it is also employed in carbohydrate and lactic acid detection. Methyl Red has been effectively used for intrageneric differentiation of Enterobacteriaceae.

Storage Class

11 - Combustible Solids

wgk_germany

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


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