Phenol red / phenol sulfonylphthalein

English Name: phenol red; Phenolsulfonephthalein； 3,3-Bis(p-hydroxyphenyl)-3H-2,1-benzoxathiole 1,1-dioxide

Other names: phenol red; Phenol sulfonyl phthalide; Phenol sulfonphthalein; 3,3-bis (p-hydroxyphenyl) - 3h-2,1-benzooxythiopentane-1,1-dioxide; Phenolsulfonphthalein; Phenolphthalein red

CAS No.: 143-74-8

C19H14O5S=354.38

Grade: ind

PH discoloration range: 1.2 (Orange) ～ 3.0 (yellow); 6.5 (brown yellow) ～ 8.0 (purple red)

Burning residue: ≤ 0.2%

Alkali dissolution test: acceptable

Mass absorption coefficient ε 1（ λ 1,pH 1.2）/（L/cm•g）：110.0～123.0

Mass absorption coefficient ε 2（ λ 2,pH 3.0）/（L/cm•g）：60.0～68.0

Mass absorption coefficient ε 3（ λ 3,pH 6.5）/（L/cm•g）：62.0～72.0

Mass absorption coefficient ε 4（ λ 4,pH 8.0）/（L/cm•g）：120.0～135.0

Maximum absorption wavelength λ 1（pH 1.2）/（nm）：503～506

Maximum absorption wavelength λ 2（pH 3.0）/（nm）：430～435

Maximum absorption wavelength λ 3（pH 6.5）/（nm）：430～435

Maximum absorption wavelength λ 4（pH 8.0）/（nm）：557～560

Physicochemical properties: bright red to dark red crystal or fine crystalline powder, stable in air. About 350 ml of ethanol, and 500 ml of acetone. It is easy to dissolve in alkali hydroxide or alkali carbonate solution and is red. It is azeotropic with zinc powder to fade. It is almost insoluble in ether and chloroform. The maximum absorption wavelength is 557 (360) nm. Irritating

Purpose: biochemical research. Acid base indicator; Determination of total blood carbon dioxide. Indicator for preparation of bisaccharide iron urea medium in bacterial serum test

Saving: RT