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methyl red

   Also found in: Wikipedia 0.01 sec.
methyl red [′meth·əl ′red]
(organic chemistry)
(CH3)2NC6H4NNC6H4COOH A dark red powder or violet crystals with a melting point of 180°C; soluble in alcohol, ether, and glacial acetic acid; used as an acid-base indicator (pH 4.2-6.2).


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Methyl red is a commonly used azo dye in laboratory assays, textiles, and other commercial products but little is known about its sensitization properties in humans.
All C freundii isolates, however, are 100% positive for methyl red (MR) test and 100% negative for Voges-Proskauer (VP) test, while most species of Enterobacter show the opposite results.
Some irreversible indicators used for bromate titrations are methyl red (color changes from red to yellow), methyl orange (color changes from red to yellow), and indigo sulfonic acid (color changes from blue to colorless) (2): Reversible redox indicators that may be used are p-ethoxychrysoiden (color changes from red to colorless), quinoline yellow (color changes from yellow-green to colorless), and a-naphthoflavone (color changes from pale yellow to orange brown) (2).
 
 
 
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