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250198 Sigma-Aldrich

Methyl Red

ACS reagent, crystalline

Synonym: 2-(4-Dimethylaminophenylazo)benzoic acid, 4-Dimethylaminoazobenzene-2′-carboxylic acid, Acid Red 2

  • CAS Number 493-52-7

  • Linear Formula (CH3)2NC6H4N=NC6H4CO2H

  • Molecular Weight 269.30

  •  Colour Index Number 13020

  •  Beilstein Registry Number 750102

  •  EC Number 207-776-1

  •  MDL number MFCD00002425

  •  PubChem Substance ID 24855040

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Properties

Related Categories Analytical Reagents, Analytical/Chromatography, Cell Biology, Hematology and Histology, Indicators,
grade   ACS reagent
InChI Key   CEQFOVLGLXCDCX-WUKNDPDISA-N
form   crystalline
visual transition interval   4.2 - 6.2, pink to yellow
mp   179-182 °C(lit.)
solubility   ethanol: 1 mg/mL
absorption   λmax 410 nm

Description

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.

Packaging

25, 100 g in glass bottle

Application

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

Safety & Documentation

Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
2
RTECS 
DG8960000

Documents

Certificate of Analysis

Certificate of Origin


Milli-Q® Water Purification Solutions

Biomedical Applications
Protocols & Articles
Peer-Reviewed Papers
15

References

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