M7267
Methyl Red
pH indicator (pH 4.4 to 6.0)
Synonym(s):
2-(4-Dimethylaminophenylazo)benzoic acid, 4-Dimethylaminoazobenzene-2′-carboxylic acid, Acid Red 2
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About This Item
Linear Formula:
(CH3)2NC6H4N=NC6H4CO2H
CAS Number:
Molecular Weight:
269.30
UNSPSC Code:
12171500
EC Number:
207-776-1
Beilstein/REAXYS Number:
750102
Colour Index Number:
13020
MDL number:
technique(s)
titration: suitable
mp
179-182 °C (lit.)
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
General description
Methyl red (MR) is an anionic azo dye, which is extensively used in paper printing and textile dyeing purposes. It is used mainly in MR test for the intrageneric differentiation of Enterobacteriaceae. It is an acid-base indicator, which changes color depending upon the pH of the solution.
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Storage Class
11 - Combustible Solids
wgk
WGK 2
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves, type N95 (US)
Regulatory Information
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Methods in Microbiology, Volume 19 (1987)
Photocatalytic degradation of Methyl Red dye in aqueous solutions under UV irradiation using Ag+ doped TiO2.
Sahoo C, et al.
Desalination, 181(1-3), 91-100 (2005)
Barron's GED Canada: High School Equivalency Exam (2008)