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Merck
CN

250198

Methyl Red

ACS reagent, crystalline

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
EC Number:
207-776-1
UNSPSC Code:
12171500
NACRES:
NA.47
PubChem Substance ID:
24855040
MDL number:
MFCD00002425
Colour Index Number:
13020
Beilstein/REAXYS Number:
750102

Key Documents

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Product Name

Methyl Red, ACS reagent, crystalline

InChI key

CEQFOVLGLXCDCX-WUKNDPDISA-N

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+

SMILES string

CN(C)c1ccc(cc1)\N=N\c2ccccc2C(O)=O

grade

ACS reagent

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

Quality Level

200

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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.

Storage Class

11 - Combustible Solids

wgk

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
SHBT2904
SHBS7421
SHBP7169
MKCJ9464
MKCJ9462

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R R colwell and R grigorova
Methods in Microbiology, 19 (1987)
A paper strip based non-invasive glucose biosensor for salivary analysis.
Soni A
Biosensors And Bioelectronics, 67, 763-768 (2015)
An improved dithizone method for the determination of small quantities of zinc in blood and tissue samples.
Vallee BL and Gibson JG 2nd
The Journal of Biological Chemistry, 176, 435-443 (1948)
R. W. Sabnis
Handbook of Acid-Base Indicators (2007)
X D Zhang et al.
Journal of hazardous materials, 170(2-3), 883-887 (2009-06-09)
An aqueous C.I. Acid Red 2 solution was decolorized by electrolysis using iron as anode. The decolorization mechanism was investigated through experimental observations on the electrochemical behavior of C.I. Acid Red 2 on Pt rotating disk electrode, UV-visible spectra of
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