Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Chemical compound
Methyl Red(pH indicator)
below pH 4.4
above pH 6.2
4.4
⇌
6.2
Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), 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, with a pKa of 5.1.[2] Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants. Methyl red is classed by the IARC in group 3 - unclassified as to carcinogenic potential in humans.
Color transition of methyl red solution under different acid–base conditions. Left: acidic, middle: about pH 5.1 (the pKa), right: alkaline
^ abcSigma-Aldrich Co., Methyl red Archived 2015-12-09 at the Wayback Machine. Retrieved on 2014-06-02.
^IB chemistry Higher Level: "IB Chemistry higher level notes: Indicators". Archived from the original on 2009-09-22. Retrieved 2009-11-29.
Methylred (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions...
increasing acidity. In a solution that decreases in acidity, methyl orange moves from the color red to orange and finally to yellow with the opposite occurring...
an acronym for each of these tests. "I" is for indole test; "M" is for methylred test; "V" is for Voges-Proskauer test, and "C" is for citrate test. The...
usually composed of water, 1-propanol, phenolphthalein, sodium hydroxide, methylred, bromothymol blue, sodium bisulfite, and thymol blue. The colours that...
has produced will make the solution very acidic and cause a red colour change. The methylred test belongs to a group known as the IMViC tests. Multiple...
Methyl anthranilate, also known as MA, methyl 2-aminobenzoate, or carbomethoxyaniline, is an ester of anthranilic acid. Its chemical formula is C8H9NO2...
Glucose phosphate broth is used to perform methylred (MR) test and Voges–Proskauer test (VP). Glucose – 5 g/L Dipotassium phosphate – 5 g/L Proteose Peptone...
citrate utilization. In identifying the organism, one may also perform a methylred test, which determines if a microorganism performs mixed-acid fermentation...
one of the species is colorless, whereas in other indicators, such as methylred, both species confer a color. While pH indicators work efficiently at...
pH indicator. In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow...
Phenol red Tryptone broth Phenylalanine agar for detection of production of deaminase, which converts phenylalanine to phenylpyruvic acid Methylred or Voges-Proskauer...
skatole, also known as methyl indole or methylated indole, another possible product of tryptophan degradation. The positive red color forms as a result...
-tokos 'producing'). Klebsiella oxytoca is characterized by negative methylred, positive VP, positive citrate, urea and TSI gas production, is AA, and...
Staphylococcus, but Micrococcus bacteria are resistant to the chemical. The methylred test is used to analyze whether a bacterium produces acids through sugar...
Methyl methacrylate (MMA) is an organic compound with the formula CH2=C(CH3)COOCH3. This colorless liquid, the methyl ester of methacrylic acid (MAA)...
the solution being acidic at the equivalence point and indicators such as methyl orange and bromothymol blue being most appropriate. Titrations between a...
test CAMP test Citrate test Coagulase test DNAse test IMViC KOH test Methylred test Nitrite test ONPG test Oxidative/fermentation glucose test Phenylalanine...
Many are useful dyes (see azo dye). Important azo dyes include methylred and pigment red 170. Azo printing exploits this reaction as well. In this case...
and therefore enzyme activity. However, a recent study suggests that methylred is more useful in determining activity due to the bright yellow ring formed...
Indole-negative and nitrate reductase-positive (no gas bubbles produced) Methylred-positive and Voges-Proskauer negative (Can be both MR- and V-P-positive)...
PMC 4308867. PMID 25428245. Pickering, Larry K., ed. (2006). "Syphilis". Red Book: 2006 Report of the Committee on Infectious Diseases. American Academy...
temperatures tolerated is 30–55 °C (86–131 °F). IMViC tests VP and MR (methylred) are positive. The species was first isolated and described in 1915 by...
have vivid colors, especially reds, oranges, and yellows. An example is Disperse Orange 1. Some azo compounds, e.g., methyl orange, are used as acid-base...
or undergo diazonium coupling reactions such as in the synthesis of methylred. It reacts with phosgene to give isatoic anhydride, a versatile reagent...
test CAMP test Citrate test Coagulase test DNAse test IMViC KOH test Methylred test Nitrite test ONPG test Oxidative/fermentation glucose test Phenylalanine...
test CAMP test Citrate test Coagulase test DNAse test IMViC KOH test Methylred test Nitrite test ONPG test Oxidative/fermentation glucose test Phenylalanine...
characteristics of E. coli are that it is oxidase-negative, citrate-negative, methyl-red positive, and Voges-Proskauer-negative. To sum up E. coli, it is a coliform...
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