Methyl Red CAS 493-52-7 C15H15N3O2

Methyl red can be used for in vivo staining of protozoa, acid-base indicator (pH4.4to6.2), and biochemical testing of clinical serum proteins. Its pH color change range is 4.4(red)-6.2(yellow). It can titrate ammonia, weak organic bases and alkaloids, but is not suitable for organic acids other than oxalic acid and bitter acid. It can be combined with bromocresol green and methylene blue to form a mixed indicator to shorten the color change range and enhance the sensitivity of color change. It can also be used as an adsorption indicator for precipitation titration, such as titrating fluoride ions with thorium nitrate, and can also be used to detect oxidants such as free chlorine and chlorite

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Description

Methyl Red Basic information
Description
Product Name:	Methyl Red
CAS:	493-52-7
MF:	C15H15N3O2
MW:	269.3
EINECS:	207-776-1
Mol File:	493-52-7.mol
Methyl Red Chemical Properties
Melting point	179-182 °C (lit.)
Boiling point	412.44°C (rough estimate)
bulk density	300-500kg/m3
density	0.839 g/mL at 25 °C
vapor density	9.3 (vs air)
refractive index	1.5930 (estimate)
Fp	11 °C
storage temp.	Store at +5°C to +30°C.
solubility	ethanol: soluble1mg/mL
pka	4.95(at 25℃)
form	Solid
Colour Index	13020
color	Reddish-violet
Odor	Odorless
PH Range	4.4(red)-6.3(yellow)
Water Solubility	Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.
ε(extinction coefficient)	≥10000 at 282-288nm in methanol
	≥20000 at 509-519nm in methanol
	≥7000 at 329-335nm in methanol
λmax	410nm, 530nm, 427nm, 519nm
Merck	146,119
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
InChIKey	CEQFOVLGLXCDCX-MSUUIHNZSA-N
CAS DataBase Reference	493-52-7
IARC	3 (Vol. 8, Sup 7) 1987
NIST Chemistry Reference	Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-(493-52-7)
EPA Substance Registry System	Methyl red (493-52-7)

Application:

Acid-base indicator

Biological stain

Redox indicator

Safety profile:

It is a non-toxic and safe ingredient. A small amount of use is beneficial to the skin. It is not sensitive either, but it causes a slight irritation to sensitive skin. Therefore, it is recommended to conduct patch testing.

It is also safe for the environment. Depending on its source, it may be regarded as a vegetarian or it may not.

Storage requirements:

keep the product dry

relative humidity < 50%

protect product against influences of weather and contamination

Transport & Packaging:

It is the only packaging available in different sizes. It can be packaged in various specifications: 25kg drums, 1000kg IBC drums