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|Section2= |Section3= }} 1,2,4-Trihydroxyanthraquinone, commonly called purpurin, is an anthraquinone. It is a naturally occurring red/yellow dye. It is formally derived from 9,10-anthraquinone by replacement of three hydrogen atoms by hydroxyl (OH) groups. Purpurin is also called verantin, smoke Brown G, hydroxylizaric acid, and C.I. 58205. It is a minor component of the classical lake pigment "madder lake" or Rose Madder. == History == Madder root has been used for dying cloth at least since 1500 BC.〔 ''(Madder Root )'' catalog entry at Natural Pigments website. Accessed on 2010-01-22. 〕 Purpurin and alizarin were isolated from the root by Pierre Robiquet and Colin, two French chemists, in 1826. They were identified as anthracene derivatives by Gräbe and Liebermann in 1868. They also synthesized alizarin from bromoanthraquinone, which, together with the conversion of alizarin into purpurin published previously by M. F. De Lalande, provided the first synthetic route to purpurin.〔Chemical news and journal of industrial science, Volume 30, Page 207〕 The positions of the OH groups were determined by Bayer and Caro in 1874–1875.〔 Wahl, Andre; Atack, F. W (1919) ''The Manufacture Of Organic Dyestuffs''. G. Bell And Sons, Limited. ( Online version ) accessed on 2010-01-22. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1,2,4-Trihydroxyanthraquinone」の詳細全文を読む スポンサード リンク
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