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Bromoindirubins: the synthesis and properties of minor components of Tyrian purple and the composition of the colorant from Nucella lapillus
Clark, R.J.H.; Cooksey, C.J. (1997). Bromoindirubins: the synthesis and properties of minor components of Tyrian purple and the composition of the colorant from Nucella lapillus. J. Soc. Dyers Colour. 113(11): 316-321. hdl.handle.net/10.1111/j.1478-4408.1997.tb01852.x
In: Journal of the Society of Dyers and Colourists. Wiley: Bradford. ISSN 0037-9859, more
Peer reviewed article  

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Keywords
    Dyes; Nucella lapillus (Linnaeus, 1758) [WoRMS]; Marine
Author keywords
    Bromoindirubins; Tyrian purple

Authors  Top 
  • Clark, R.J.H.
  • Cooksey, C.J.

Abstract
    The identification of 6, 6'-dibromoindirubin as a component of Tyrian purple has been confirmed by a practical synthesis. Two monobromoindirubins, which could be minor components, have also been synthesised. These compounds have been fully characterised by UV/vis, NMR, IR and MS data. However, the use of UV/vis absorption maxima in solution is shown to be an unreliable identification tool, being solvent dependent. MS cannot distinguish 6, 6'-dibromoindirubin from 6, 6'-dibromo-indigotin, the major component; solution NMR is precluded by lack of solubility and the colorant is best characterised by HPLC. The first investigation of the composition of Tyrian purple from Nucella lapillus is reported.

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