Polarography of Anthraquinones and Dianthrones of Rhubarb

概要

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The 1,8-dihydroxyanthraquinones such as emodin (I), physcion (II), crysophanol (III), aloe-emodin (IV) and rhein (V) show reversible 2-electron reduction wave forming the hydroquinones in aqueous isopropanol solutions. Their semiquinones are stable in dimethylformamide. Sennosides (VI) show irreversible 2-electron reduction wave accompanied with 2 adsorption waves, which are ascribed to reductive cleavage of the C-C bridge to the anthrone (VII). The carbonyl in VII is successively reduced to the corresponding alcohol (XI), which seems to dehydrate to the anthracene (XII). Then, the I-V and VI in rhubarb can be determined by polarography.
公益社団法人日本薬学会の論文
1974-02-25