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.[1]

Biochem/physiol Actions

Methyl Red is a maroon red crystal azo dye.[2] Methyl Red is a pH indicator and changes color at a pH of 5.5.[3] Methyl Red is widely used in saliva sampling method. In addition, it is also employed in carbohydrate and lactic acid detection.[2] Methyl Red has been effectively used for intrageneric differentiation of Enterobacteriaceae.[4]

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