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861235

Sigma-Aldrich

Methyl Red hydrochloride

ACS reagent

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Synonym(s):
4-Dimethylaminoazobenzene-2′-carboxylic acid hydrochloride, Acid Red 2
Linear Formula:
(CH3)2NC6H4N=NC6H4CO2H·HCl
CAS Number:
63451-28-5
Molecular Weight:
305.76
Colour Index Number:
13020
EC Number:
264-190-9
MDL number:
MFCD00012614
UNSPSC Code:
12171500
PubChem Substance ID:
24888532
NACRES:
NA.47

grade

ACS reagent

Quality Level

200

form

powder or crystals

visual transition interval

4.2-6.2, pink to yellow

mp

175 °C (dec.) (lit.)

solubility

ethanol: 0.1%

λmax

493 nm

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

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

InChI

1S/C15H15N3O2.ClH/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);1H/b17-16+;

InChI key

ICTWKXAVJAHRMK-CMBBICFISA-N

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General description

Methyl red (C.I. 13020) is also known as acid red 2. The hydrochloride form is slightly soluble in water and ethanol.

Application

Methyl red is widely used in food science and applied & pure biology. It is added in media while preparing agar plates for microbiology. It is used as a vital stain for protozoa. Methyl red is also utilized as a tracer for assessing penetration of foods into packaging and as a component of an indicator to examine pork quality. It has been used to study the ability of earthworms to modify their environmental pH.

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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