Journal
JOURNAL OF MASS SPECTROMETRY
Volume 38, Issue 12, Pages 1252-1258Publisher
WILEY
DOI: 10.1002/jms.549
Keywords
natural dyestuffs; anthraquinone compounds; capillary electrophoresis; electrospray mass spectrometry
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Capillary electrophoresis with UV/visible diode-array detection (DAD) and electrospray mass spectrometric (ESI-MS) detection were used for the identification of anthraquinone color components of cochineal, lac-dye and madder, natural red dyestuffs often used by ancient painters. For the purpose of such analysis, ESI-MS was found to be a much more appropriate detection technique than DAD one owing to its higher sensitivity (detection limits in the range 0.1-0.5 mug ml(-1)) and selectivity. The method developed made it possible to identify unequivocally carminic acid and laccaic acids A, B and E as coloring matters in the examined preparations of cochineal and lac-dye, respectively. In madder, European Rubia tinctorum, alizarin and purpurin were found. The method allows the rapid, direct and straightforward identification and quantification of components of natural products used in art and could be very helpful in restoration and conservation procedures. Copyright (C) 2003 John Wiley Sons, Ltd.
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