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• W2024448055 abstract "Flavonoid glycoconjugates from roots and leaves of eight North America lupine species (Lupinus elegans, Lupinus exaltatus, Lupinus hintonii, Lupinus mexicanus, Lupinus montanus, Lupinus rotundiflorus, Lupinus stipulatus, Lupinus sp.), three Mediterranean species (Lupinus albus, Lupinus angustifolius, Lupinus luteus) and one species from South America domesticated in Europe (Lupinus mutabilis) were analyzed using two LC/MS systems: low-resolution ion trap instrument and high-resolution quadrupole-time-of-flight spectrometer. As a result of the LC/MS profiling using the CID/MSn experiments structures of 175 flavonoid glycoconjugates found in 12 lupine species were identified at three confidence levels according to the Metabolomic Standard Initiative, mainly at level 2 and 3, some of them were classified to the level 1. Among the flavonoid derivatives recognized in the plant extracts were isomeric or isobaric compounds, differing in the degree of hydroxylation of the aglycones and the presence of glycosidic, acyl or alkyl groups in the molecules. The elemental composition of the glycoconjugate molecules was established from the exact m/z values of the protonated/deprotonated molecules ([M+H]+/[M−H]−) measured with the accuracy better than 5 ppm. Information concerning structures of the aglycones, the type of sugar moieties (hexose, deoxyhexose or pentose) and, in some cases, their placement on the aglycones as well as the acyl substituents of the flavonoid glycoconjugates was achieved in experiments, in which collision-induced dissociation was applied. Flavonoid aglycones present in the studied O-glycoconjugates were unambiguously identified after the comparison of the pseudo-MS3 spectra with the spectra registered for the standards. Isomers of flavonoid glycoconjugates, in which one or two sugar moieties were attached to 4′- or 7-hydroxyl groups or directly to the C-6 or C-8 of the aglycones, could be distinguished on the basis of the MS2 spectra. However, the collision energy applied in the CID experiments had to be optimized for each group of the compounds and there were no universal settings that allowed the acquisition of structural information for all the compounds present in the sample. Information obtained from the flavonoid conjugate profiling was used for the chemotaxonomic comparison of the studied lupine species. A clear-cut discrimination of the Mediterranean and North American lupines was obtained as a result of this analysis." @default.
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• W2024448055 date "2013-08-01" @default.
• W2024448055 modified "2023-10-17" @default.
• W2024448055 title "Structural analysis and profiling of phenolic secondary metabolites of Mexican lupine species using LC–MS techniques" @default.
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• W2024448055 doi "https://doi.org/10.1016/j.phytochem.2013.04.006" @default.
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