Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 406, Issue 15, Pages 3703-3708Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-013-7589-3
Keywords
Sawwort; Yellow natural dyestuff; Luteolin glucuronides
Funding
- European Union in the framework of the European Social Fund through the Warsaw University of Technology Development Program
- Center for Advanced Studies of Warsaw University of Technology
- National Science Center [N N204 247040]
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Extracts from wool dyed with sawwort (Serratula tinctoria L.) obtained with methanol/formic acid and methanol/hydrochloric acid solutions were examined by high-performance liquid chromatography with UV detection coupled with electrospray ionization tandem mass spectrometry. Chromatograms and mass spectra were registered in the negative ion mode under various orifice voltages and collision energies, which enabled us to observe signals corresponding to [M -aEuro parts per thousand H](-) ions and also Y- and/or Y-aEuro cent ions, which were further subjected to fragmentation. The results obtained allowed us to define previously unknown constituents of sawwort, which are proposed as specific markers for its identification: chlorogenic acid and its isomers, luteolin-O-glucuronides, eriodictyol-O-glucuronides, and diosmetin-O-glucuronides. Moreover, it was found that during extraction, flavonoid O-glucuronides react with methanol in the presence of hydrochloric acid, forming stable O-methylated derivatives.
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