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Now just a bit of chemistry about how the compounds in plants are converted
into indigo ...
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In Indigofera species, the
precursor of indigo is indican
(left), indoxyl-β-D-glucopyranoside, while in woad it is mainly isatan A (right) |
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Oberthür C, Schneider B, Graf H, Hamburger M, The Elusive Indigo Precursors in Woad (Isatis tinctoria L.) - Identification of the Major Indigo Precursor, Isatan A, and a Structure Revision of Isatan B, Chemistry & Biodiversity, 2004, 1(1), 174 - 182 |