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Thermo Scientific Chemicals
Methyl Red sodium salt
CAS: 845-10-3 | C15H14N3NaO2 | 291.286 g/mol
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化學識別
CAS845-10-3
IUPAC Namesodium 2-{2-[4-(dimethylamino)phenyl]diazen-1-yl}benzoate
Molecular FormulaC15H14N3NaO2
InChI KeyGNTPCYMJCJNRQB-UHFFFAOYSA-M
SMILES[Na+].CN(C)C1=CC=C(C=C1)N=NC1=CC=CC=C1C([O-])=O
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規格
規格表
規格表Specific Absorbance (E 1%/1cm)≥585 (@ lambda max)
Appearance (Color)Orange to Brown
Appearance (Color)pH4.2 (Violet Red) - pH6.2 (Brown Yellow)
Solution Test0.1% w/v (in distilled water): Clear
lambda-max (UV-Vis)430.0-440.0nm (in distilled water)
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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.
Applications
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.
Solubility
Soluble in water (800 mg/ml at 25°C), and slightly soluble in ethanol at (25°C).
Notes
Store at room temperature. Reactive with oxidizing agents.
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.
Solubility
Soluble in water (800 mg/ml at 25°C), and slightly soluble in ethanol at (25°C).
Notes
Store at room temperature. Reactive with oxidizing agents.
RUO – Research Use Only
General References:
- Bin Zhao.; Jeffrey S. Moore.; David J. Beebe. Surface-Directed Liquid Flow Inside Microchannels. Science. 2001, 291 (5506),1023-1026.
- Shizhuo Yin.; Kun-Wook Chung.; Xin Zhu. A novel all-optic tunable long-period grating using a unique double-cladding layer. Opt. Commun.. 2001, 196 (1-6),181-186.