CAS: 573-58-0, Congo Red, Direct Congo Red

Name: Direct Congo red, boiled red, cotton red, direct vermilion, direct red, diphenyl-4,4'-bis[(azo 2)-1-aminonaphthalene-4-sulfonic acid sodium, direct red 28, 3,3-[[1,1-biphenyl]-4,4-ylbis(azo)]bis(4-aminonaphthalene-1-sulfonic acid) disodium CAS number: 573-58-0 C32H22N6Na2O6S2=696.66 Grade: IND pH color change domain: 3.0 (blue-violet) ~ 5.2 (red) Transparency of indicator solution: qualified water insolubles: ≤ 1.0% moisture: ≤ 5.0% ignition residue (sulfate): ≤ 27.0% Properties: Brownish red powder. Soluble in water, yellowish red, soluble in ethanol, orange, very slightly soluble, almost insoluble in ether. The maximum absorption wavelength (pH 7.3) is 488 nm (E1%1 cm595). Median lethal dose (rat, vein) 190 mg/kg Use: Biochemical study. Acid-base indicator. The acidity in the gastric juice and the paper was measured. Determination of boric acid, cyanide. Additive for biological media. Biological staining, such as embryo sectioning, plant mucin, cellulose, elastic tissue, etc.

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