Description
Methyl red supplement, for microbiology, Molar mass (M) 269,31 g/mol, Density (D) ~0,79 g/cm³, Flash point (flp) 22 °C, Boiling point (bp) 78 °C, Storage temp. +15 to +25 °C, CAS No. 493-52-7, UN-Nr. 1170, Empirical formula C15H15N3O2
Application
Acid formation during mixed acid fermentation is detected with the methyl red test (MR test).
Mixed acid fermentation produces a lot of acid (pH<4.4), which leads to a deep red colour (positive) after adding the methyl red solution. If no mixed acid fermentation takes place, little acid is present and a yellow/orange colour (negative) results.
The methyl red test is part of the Bunte series for the differentiation of bacteria, especially from the Enterobacteriaceae group.
Technical Information
| Use | Methyl red test, MRVP test |
Compliance & Safety Information
Danger
Hazard Statements (H-Phrases)
H225
Highly flammable liquid and vapour
H319
Causes serious eye irritation
Precautionary Statements (P-Phrases)
P210
Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P305+P351+P338
IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.