Methyl Red sodium salt

CAS: 845-10-3

Ref. 02-A17455

Product Information

• Name: Methyl Red sodium salt
• Synonyms: sodium 2-{2-[4-(dimethylamino)phenyl]diazen-1-yl}benzoate, 2-[4-(Dimethylamino)phenylazo]benzoic acid, sodium salt, 2-{(E)-[4-(dimethylamino)phenyl]diazenyl}benzoate, Benzoic acid, 2-[2-[4-(dimethylamino)phenyl]diazenyl]-, sodium salt (1:1), Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-, sodium salt, Methyl Red Sodium Crystalline, Methyl Red, water soluble, Sodium 2-(P-(Dimethylamino)Phenylazo)Benzoate, o-Methyl red sodium salt, sodium 2-{(E)-[4-(dimethylamino)phenyl]diazenyl}benzoate

Description

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. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

• Brand: Alfa Aesar By Thermo Fisher Scientific

Chemical properties

• Molecular weight: 291.29
• Formula: C₁₅H₁₄N₃NaO₂
• Color/Form: Orange to Brown, pH4.2 (Violet Red) - pH6.2 (Brown Yellow), Powder
• InChI key: GNTPCYMJCJNRQB-UHFFFAOYSA-M