Abstract
ALIZARIN and purpurin have always been described as the two chief tinctorial substances of madder. I have found that the purpurin obtained from madder does not derive from a previously suspected purpurin glycoside but from a glycoside of pseudopurpurin. (Alizarin is 1: 2-dihydroxyanthraquinone, purpurin is 1:2: 4-trihydroxyanthraquinone and pseudopurpurin is purpurin 3-carboxylic acid.)
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HILL, R. A New Glycoside from Madder. Nature 134, 628 (1934). https://doi.org/10.1038/134628a0
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DOI: https://doi.org/10.1038/134628a0
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