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Synonyms: 4-Dimethylaminoazobenzene-2'-carboxylic acid sodium salt, Acid Red 2
Methyl Red sodium salt is the sodium salt of Methyl Red. Methyl red is an indicator dye that turns red in acidic solutions. It is a pH indicator, turning red under pH 4.4, yellow over pH 6.2, and orange in between those values. It is used in microbiology in the Voges-Proskauer test to identify bacteria that produce stable acids through mixed acid fermentation of glucose. Methyl-red positive bacteria include Proteus vulgaris and Escherichia coli. Methyl-red negative bacteria include Enterobacter aerogenes and Serratia marcescens.
M 2229 (OTTO) Methyl red sodium salt Cas 845-10-3 - used for pH detection.
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