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Analytical and Bioanalytical Chemistry

, Volume 382, Issue 2, pp 259–268 | Cite as

Identification of natural dyes used in works of art by pyrolysis–gas chromatography/mass spectrometry combined with in situ trimethylsilylation

  • María José Casas-Catalán
  • María Teresa Doménech-CarbóEmail author
Special Issue Paper

Abstract

Samples of four natural dyes from different organic families—natural madder (anthraquinonoid), curcuma (curcuminoid), saffron (carotenoid) and indigo (indigotic)—were analysed using a new procedure based on pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS), which includes the on-line derivatisation of the natural dyes using hexamethyldisilazane (HMDS). In addition, a previous procedure involving the addition of a 10% H2SO4 aqueous solution to the dye and further separation with ethyl acetate has been tested. This procedure enhances the sensitivity of the method by extracting the colouring compounds from the rest of the compounds present in the natural dye. Two possible derivatising reagents—HMDS and tetramethylammonium hydroxide (TMAH)—were compared in order to assess their effectiveness in the proposed method. Characteristic peaks from trimethylsilyl derivatives of alizarin, quinizarin, xanthopurpurin and purpurin were obtained for madder; peaks from safranal, isophorone and trimethylsilyl derivative of crocetin for saffron; peaks from 4-(4-hydroxy-3-methoxy)phenyl-3-buten-2-one and 4-(4-hydroxy-3-methoxy)phenyl-2-butanone, which are primary pyrolysis products of curcuma, and peaks from indole, 2-methylindole and 2,3-dihydroindol-2-one, which are primary pyrolysis products of indigo, among others, were obtained. The reported procedure leads to the unambiguous identification of the four studied dyes from solid samples formed by individual dyes.

Keywords

Madder Saffron Curcuma Indigo Py–GC/MS Hexamethyldisilazane Tetramethylammonium hydroxide 

Notes

Acknowledgements

Financial support is gratefully acknowledged from the “I+D+I MCYT” Project BQU2001-2776-C03-01 and “Generalitat Valenciana I+D” Project GV04B-441.

Supplementary material

216_2005_3064_esm.pdf (152 kb)
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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • María José Casas-Catalán
    • 1
  • María Teresa Doménech-Carbó
    • 1
    Email author
  1. 1.Department of Conservation and Restoration of Cultural HeritagePolytechnical University of ValènciaValènciaSpain

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