Fluorescein / fluorescent red / fluorescent orange red / acid yellow 73

English Name: fluorescein; Diresorcinolphthalein； Dihydroxyfluorane； Tetraoxyphthalophenonean hydride； C.I. 45350

Other names: fluorescent red; Fluorescent yellow; Fluorescent orange red; Acid yellow 73; Fluorescein;  2 - (6-hydroxy-3-oxo-3h-xanthen-9-yl) benzoic acid; Fluorescent orange;  Fluorescent ester

CAS No.: 2321-07-5

C20H12O5=332.31

Grade: ar

Loss on drying: ≤ 5.0%

Sensitivity test: acceptable

Ethanol dissolution test: acceptable

Burning residue: ≤ 0.3%

Physicochemical properties: yellow red to red powder. It is soluble in hot ethanol, glacial acetic acid, alkali carbonate and alkali hydroxide, and has bright green fluorescence. It is insoluble in water, benzene, chloroform and ether. Melting point: 314-316 ℃ (in sealed tube, decomposed). The maximum absorption wavelength is 493.5 and 460nm. Minimum lethal dose (rat, abdominal cavity) 600mg/kg

Purpose: biochemical research. Adsorption indicator; Redox indicator. Sulfur ion was analyzed by fluorescence spectrophotometry; Titration of chlorine, bromine and iodine

Saving: RT