1,8-Dihydroxyanthraquinone

Danthron; dantron, dihydroxyanthraquinone; 1,8-Dihydroxyanthracene-9,10-dione; C₁₄H₈O₄ = 240.2 (117-10-2)

Crystalline orange powder, practically insoluble in water, slightly soluble in ethanol (96%), soluble in solutions of alkali hydroxides.

Melting point, about 195°.

Dantron used in the sesquiterpenic acids assay in Valerian root (0453) complies with the following additional tests.

A(1%, 1 cm), 355 to 375, determined at 500 nm in 1 M potassium hydroxide.

Assay Liquid chromatography (2.2.29) as prescribed in the monograph Valerian Root (0453) at the concentration of the reference solution.

Content, minimum 95%, calculated by the normalisation procedure.