期刊
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
卷 284, 期 1-3, 页码 57-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijms.2008.05.039
关键词
Flavonoids; Electrospray; Historical textiles; Lake pigments
资金
- Ministerio para a Ciencia e Tecnologia, Portugal [PRAXIS XXI BD 13451/97]
- EPSRC [GR/L53618]
- National Museums of Scotland Charitable Trust
- Fundação para a Ciência e a Tecnologia [PRAXIS XXI/BD/13451/97] Funding Source: FCT
Flavonoids are amongst the most commonly used natural yellow colourants in paintings, as lakes, and in historical textiles as mordant dyes. In this paper, evidence from isotopically labelled substrates is used to propose negative ion electrospray collision induced decomposition mechanisms of flavones, flavonols and an isoflavone. These mechanisms include a retro-Diels-Alder fragmentation (observed for flavones and flavonols) and an M-122 fragmentation (characteristic of 3',4'-dihydroxyflavonols). In addition, the presence of a m/z 125 fragment ion is shown to be characteristic of 2'-hydroxyflavonols and an ion at m/z 149 is shown to be characteristic of 4'-hydroxyflavones. Applications of these methods are exemplified by the identification of a minor component of Dyer's camomile (Anthemis tinctoria L.) and the identification of the dye source in green threads sampled from an 18th Century Scottish tartan fragment. (C) 2008 Elsevier B.V. All rights reserved.
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