Methyl red
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Methyl red | |
---|---|
Systematic name | Methyl red |
Chemical formula | C15H15N3O2 |
Molecular mass | 269.299 g/mol |
Density | x.xxx g/cm3 |
Melting point | 179-182 °C |
Boiling point | xx.x °C |
CAS number | [63451-28-5] [845-10-3] (sodium salt) |
SMILES | CN(C)c2ccc(/N=N/ c1ccccc1C(O)=O)cc2 |
Disclaimer and references |
Methyl Red, also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder.
Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between.
Methyl Red (pH indicator) | ||
below pH 4.4 | above pH 6.2 | |
4.4 | ↔ | 6.2 |
In microbiology, methyl red is used in the Methyl Red (MR) Test, used to identify bacteria producing stable acids by mechanisms of mixed acid fermentation of glucose. Cf. Voges-Proskauer (VP) test.
Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants. [1]
Methyl red is an IARC group 3 carcinogen: the evidence of its carcinogenity is inadequate. Its risk phrases are R20 R21 R22 R36 R37 R38 R40.
[edit] See also
[edit] External links
- Nile Chemicals -- Methyl Red A site showing some extra information on methyl red.
- Synthesis of methyl red