Methyl red / alkyl red / methane red / acid red 2 / MR
Item No.： SR0025
Store at： RT，Keep away from li
English Name: methyl red; MR； C.I. 13020； Acid Red 2； 2-[4-(Dimethylamino)phenylazo]benzoic acid
Other name: Jiahong; Alkane red; Methane red; P-dimethylaminoazobenzene O-carboxylic acid; Acid red 2; 2 - [[4 - (dimethylamino) phenyl] azo] benzoic acid
CAS No.: 493-52-7
C15H15N3O2=269.30
Grade: ar
Grade: ind
PH discoloration range: 4.5 (red) ～ 6.2 (yellow)
Loss on drying: ≤ 1.0%
Ethanol dissolution test: acceptable
Mass absorption coefficient（ λ 1，pH 4.5）/[L/（cm?g）]：≥130.0
Mass absorption coefficient（ λ 2，pH 6.2）/[L/（cm?g）]：≥70.0
Burning residue: ≤ 0.2%
Maximum absorption wavelength（ λ 1，pH 4.5）/（nm）：523～528
Maximum absorption wavelength（ λ 2，pH 6.2）/（nm）：427～437
Physicochemical properties: shiny purple crystal or reddish brown powder. Soluble in ethanol and acetic acid, almost insoluble in water. After a long time storage, the sensitivity of ethanol solution can be significantly reduced due to the esterification of carboxyl groups
Purpose: biochemical research. In vivo staining of protozoa; Acid base indicator. Titration of ammonia, weak organic bases and alkaloids, but not applicable to organic acids other than oxalic acid and picric acid. It can be mixed with bromocresol green and methylene blue to shorten the color gamut and improve the sensitivity of color change. Adsorption indicator for precipitation titration, such as fluorine ion titration with thorium nitrate. Verification of free chlorine and chlorite
Save: RT, protected from light
