250198

Methyl Red

ACS reagent, crystalline

• Synonym(s): 2-(4-Dimethylaminophenylazo)benzoic acid, 4-Dimethylaminoazobenzene-2′-carboxylic acid, Acid Red 2
• Linear Formula: (CH₃)₂NC₆H₄N=NC₆H₄CO₂H
• CAS Number: 493-52-7
• Molecular Weight: 269.30
• Colour Index Number: 13020
• Beilstein: 750102
• EC Number: 207-776-1
• MDL number: MFCD00002425
• UNSPSC Code: 12171500
• PubChem Substance ID: 24855040
• NACRES: NA.47

Properties

• grade: ACS reagent
• Quality Level: 200
• 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

Description

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.

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 2
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves