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ChemicalBook Product Catalog Biochemical Engineering Biochemical Reagents Acid-base indicator Methyl Red

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Methyl Red

$ 1.00 /1KG

Min. Order1G
Purity99%
Cas No493-52-7
Supply Ability100KG
Update time2019-07-06

career henan chemical co

career henan chemical co

7YR

China

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Chemical Properties

Product Name	Methyl Red
CAS No	493-52-7
EC-No	207-776-1
Min. Order	1G
Purity	99%
Supply Ability	100KG
Release date	2019/07/06

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Methyl Red Basic information

Description

Product Name:	Methyl Red
Synonyms:	CI NO 13020;BROMOCRESOL GREEN-METHYL RED;BROMOCRESOL GREEN-METHYL RED ETHANOL;BROMOCRESOL GREEN/METHYL RED, MIXED INDICATOR;BROMOCRESOL GREEN/METHYL RED, MIX INDICATOR FOR ALKALINITY;METHYL RED;METHYL RED INDICATOR;METHYL RED MIXED SOLUTION
CAS:	493-52-7
MF:	C15H15N3O2
MW:	269.3
EINECS:	207-776-1
Product Categories:	Organics;Analytical Chemistry;Indicator (pH);pH Indicators;Biochemical Reagents for Identification;Identification Tests&Reagents;Microbiology;BTitration;Indicator Solutions;Indicators;Stains and Dyes;Stains&Dyes, A to;Titration;Azo
Mol File:	493-52-7.mol

Methyl Red Chemical Properties

Melting point	178-182°C
density	0.839 g/mL at 25 °C
Fp	11 °C
storage temp.	−20°C
solubility	ethanol: soluble1mg/mL
form	Solid
pka	4.95(at 25℃)
Colour Index	13020
color	Reddish-violet
PH Range	4.4(red)-6.3(yellow)
Water Solubility	Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.
λmax	410nm, 530nm, 427nm, 519nm
Merck	14,6119
BRN	750102
Stability:	Stable. Incompatible with strong oxidizing agents.
Major Application	Waveguides, LED sensors, photoresists, liquid crystals, sol-gel matrix, optical sensors, paints, toys, detection of thiols, food freshness sensors, dental product, saliva sampling method, detecting lactic acid, carbohydrates
NIST Chemistry Reference	Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-(493-52-7)
EPA Substance Registry System	Benzoic acid, 2-[[4-(dimethylamino)phenyl] azo]-(493-52-7)

Safety Information

Hazard Codes	Xn,T,F,Xi,C,N
Risk Statements	10-20/21/22-68/20/21/22-68-36/38-23/25-11-36/37/38-34-51/53-39/23/24/25-23/24/25
Safety Statements	36/37-24/25-22-45-33-24-16-7-36-26-36/37/39-61
RIDADR	UN 1170 3/PG 2
WGK Germany	1
RTECS	DG8960000
TSCA	Yes
HazardClass	3
PackingGroup	II
HS Code	29270000
Hazardous Substances Data	493-52-7(Hazardous Substances Data)

Methyl Red Usage And Synthesis

Description	Methyl red is a commonly used indicator for acid-base titrations. This chemical is usually yellow but turns red below pH 4.0. Bacteria exhibiting mixed acids fermentation will accumulate acids in the medium, resulting in a color change. Approximately five drops of methyl red reagent are added to an overnight culture grown in MRVP broth to determine the test result. Different bacteria convert dextrose and glucose to pyruvate using different metabolic pathways. Some of these pathways produce unstable acidic products which quickly convert to neutral compounds. Some organisms use the butylene glycol pathway, which produces neutral end products, including acetoin and 2,3-butanediol. Other organisms use the mixed acid pathway, which produces acidic end products such as lactic, acetic, and formic acid. These acidic end products are stable and will remain acidic. The Methyl Red test involves adding the pH indicator methyl red to an inoculated tube of MR-VP broth. If the organism uses the mixed acid fermentation pathway and produces stable acidic end-products, the acids will overcome the buffers in the medium and produce an acidic environment in the medium. When methyl red is added, if acidic end products are present, the methyl red will stay red.
Chemical Properties	dark red crystalline powder
Uses	Used as pH indicator.
Uses	As indicator in 0.1% alcoholic solution; pH: 4.4 red, 6.2 yellow. Used for titrating NH3, weak organic bases, e.g., alkaloids; not suitable for organic acids, except oxalic and picric acid. Methyl red is easily reduced, thereby losing its color, and readings should be made promptly. It is gradually being replaced by sulfonphthalein indicators, such as bromcresol green, which are more stable and exhibit a sharper change in color.
Definition	ChEBI: An azo dye consisting of benzoic acid substituted at position 2 by a 4-[(dimethylamino)phenyl]diazenyl group.

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