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Merck

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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RM 1,129.00

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RM 3,422.00

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About This Item

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

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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

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This Item
08714114502861235
Methyl Red ACS reagent, crystalline

Sigma-Aldrich

250198

Methyl Red

Methyl Red solution suitable for microbiology

Millipore

08714

Methyl Red solution

Methyl Red sodium salt ACS reagent, Dye content 95 %

Sigma-Aldrich

114502

Methyl Red sodium salt

Methyl Red hydrochloride ACS reagent

Sigma-Aldrich

861235

Methyl Red hydrochloride

technique(s)

titration: suitable

technique(s)

microbe id | metabolite detection: suitable

technique(s)

titration: suitable

technique(s)

-

grade

ACS reagent

grade

-

grade

ACS reagent

grade

ACS reagent

form

crystalline

form

-

form

powder

form

powder or crystals

solubility

ethanol: 1 mg/mL

solubility

-

solubility

water: 0.1%

solubility

ethanol: 0.1%

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

clinical testing
environmental
food and beverages, microbiology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

storage temp.

-

storage temp.

room temp

storage temp.

room temp

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]

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

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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)
Angel Martinez et al.
Proceedings of the National Academy of Sciences of the United States of America, 108(52), 20891-20896 (2011-12-14)
Noncontact optical trapping and manipulation of micrometer- and nanometer-sized particles are typically achieved by use of forces and torques exerted by tightly focused high-intensity laser beams. Although they were instrumental for many scientific breakthroughs, these approaches find few technological applications
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