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Methyl Red

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Company Name: career henan chemical co
Tel: +86-371-86658258
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Products Intro: Product Name:Methyl Red
CAS:493-52-7
Purity:99% Package:1KG;1USD
Company Name: TCI  Gold
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Products Intro: Product Name:Bromocresol Green - Methyl Red Solution (Ethanol Soln.)[mixed Indicator]
CAS:493-52-7
Package:100ML,500ML
Company Name: Creasyn Finechem(Tianjin) Co., Ltd.  
Tel: 86-22-83945878,83945171,83945172
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Products Intro: CAS:493-52-7
Company Name: J & K SCIENTIFIC LTD.  
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Products Intro: Product Name:Methyl Red, indicator
CAS:493-52-7
Package:100G;25G;500G
Company Name: Meryer (Shanghai) Chemical Technology Co., Ltd.  
Tel: +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
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Products Intro: Product Name:Methyl red
CAS:493-52-7
Purity:Range of Colour Change 4.2-6.2 Package:25g Remarks:F70007

Lastest Price from Methyl Red manufacturers

  • Methyl Red
  • US $1.00 / KG
  • 2018-08-14
  • CAS:493-52-7
  • Min. Order: 1G
  • Purity: 99%
  • Supply Ability: 100KG
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:Analytical Chemistry;Indicator (pH);pH Indicators;Biochemical Reagents for Identification;Identification Tests&Reagents;Microbiology;Organics;Azo;BTitration;Indicator Solutions;Indicators;Stains and Dyes;Stains&Dyes, A to;Titration
Mol File:493-52-7.mol
Methyl Red Structure
Methyl Red Chemical Properties
Melting point 178-182°C
Boiling point 412.44°C (rough estimate)
density 0.839 g/mL at 25 °C
refractive index 1.5930 (estimate)
Fp 11 °C
storage temp. −20°C
solubility ethanol: soluble1mg/mL
form Solid
pka4.95(at 25℃)
Colour Index 13020
color Reddish-violet
PH Range4.4(red)-6.3(yellow)
Water Solubility Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.
λmax410nm, 530nm, 427nm, 519nm
Merck 14,6119
BRN 750102
Stability:Stable. Incompatible with strong oxidizing agents.
Major ApplicationWaveguides, 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
CAS DataBase Reference493-52-7
NIST Chemistry ReferenceBenzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-(493-52-7)
EPA Substance Registry SystemBenzoic 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 Data493-52-7(Hazardous Substances Data)
MSDS Information
ProviderLanguage
Acid Red 2 English
ACROS English
SigmaAldrich English
ALFA English
Methyl Red Usage And Synthesis
DescriptionMethyl 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 Propertiesdark red crystalline powder
UsesUsed as pH indicator.
UsesAs 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.
DefinitionChEBI: An azo dye consisting of benzoic acid substituted at position 2 by a 4-[(dimethylamino)phenyl]diazenyl group.
HazardQuestionable carcinogen.
Safety ProfileQuestionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.
Purification MethodsThe acid is extracted with boiling toluene using a Soxhlet apparatus. The crystals which separate on slow cooling to room temperature are filtered off, washed with a little toluene and recrystallised from glacial acetic acid, *benzene or toluene followed by pyridine/water. Alternatively, dissolve it in aqueous 5% NaHCO3 solution, and precipitate it from a hot solution by dropwise addition of aqueous HCl. Repeat this until the extinction coefficients do not increase. [Beilstein 16 IV 504.]
Methyl Red Preparation Products And Raw materials
Preparation ProductsTriethyl phosphite-->Calcium hydrogenphosphate dihydrate-->CALCIUM PHOSPHATE, DIBASIC-->Aceglutamide
Raw materialsN,N-Dimethylaniline-->Anthranilic acid
Tag:Methyl Red(493-52-7) Related Product Information
Thiophanate-methyl 4-Dimethylaminobenzoic acid 4-AMINOAZOBENZENE Red 2 Parathion-methyl Methylparaben Kresoxim-methyl 2-Dimethylaminoethanol ACETIC ACID METHYL RED, WATER SOLUBLE Ascoric Acid Methyl acrylate ACID RED 88 Methyl Methyl acetate Chlorodimethylphenylsilane AQUANTRAAL Anthranilic acid