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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/REAXYS Number 750102

  •  EC Number 207-776-1

  •  MDL number MFCD00002425

  •  PubChem Substance ID 24855040

  •  NACRES NA.47

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Properties

Related Categories Analytical Reagents, Analytical/Chromatography, Cell Biology, Hematology and Histology, Indicators,
Quality Level   200
grade   ACS reagent
form   crystalline
visual transition interval   4.2 - 6.2, pink to yellow
mp   179-182 °C (lit.)
solubility   ethanol: 1 mg/mL
λmax   410 nm
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

Description

Application

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

Packaging

25, 100 g in glass bottle

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.

Safety & Documentation

Safety Information

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

Documents

Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Titrette from Brand
Protocols & Articles
Peer-Reviewed Papers
15

References

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