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Merck
CN

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:
493-52-7
Molecular Weight:
269.30
UNSPSC Code:
12171500
EC Number:
207-776-1
Beilstein/REAXYS Number:
750102
Colour Index Number:
13020
MDL number:
MFCD00002425

Key Documents

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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

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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.

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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Certificates of Analysis (COA)

Lot/Batch Number
068K3522
037K3733
123K3733
123H3643
094K3729

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Methods in Microbiology, Volume 19 (1987)
Barron's GED Canada: High School Equivalency Exam (2008)
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)
Oana Alexandru et al.
Journal of neuro-oncology, 102(1), 9-18 (2010-07-17)
A major focus of brain cancer research today is to translate understanding of glioma biology into advances in treatment, by exploring the potential of target therapy. Here we investigated the ability of three compounds belonging to the chemical class of
Feng-Yun Wang et al.
Nanoscale, 3(8), 3269-3276 (2011-07-01)
Nanoporous and nonporous three-dimensional silicon nanowire arrays (SiNWAs) prepared with metal-assisted chemical etching method were investigated as photocatalysts in dye photodegradation systematically. In comparison with nonporous SiNWAs, nanoporous SiNWAs have higher surface area, larger pore volume, stronger light absorption and
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