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- W1987771657 abstract "The application of liquid chromatography/mass spectrometry (LC/MS) with a TurboIonspray (TIS) interface was investigated as a new method for the analysis of flavonoids. Eleven compounds belonging to three different classes of flavonoids were studied: eriocitrin, neoeriocitrin, naringin, narirutin, hesperidin, neohesperidin (flavanone glycosides), quercetin, kaempferol, galangin (flavonol aglycones), chrysin, apigenin (flavone aglycones). Chromatographic separations were performed under reversed-phase conditions using a C18 narrow-bore LC column; a mixture of an aqueous solution of formic acid (pH 2.4) and acetonitrile was used as the mobile phase. Isocratic elution was operated in the case of flavanones, whereas gradient elution was used for the simultaneous separation of flavones and flavonols. The adaptability of TIS to high flow applications allows the use of LC eluent flow rates at 200 µL/min without post-column splitting. Qualitative analysis was performed in negative-ion (NI) full-scan mode, whereas response linearity, detection limits and precision of the method were studied under NI selected ion monitoring (SIM) conditions. Characterization of isomers differing in the glycosylation was found to be possible on the basis of different mass spectra. Detection limits in the low-ng range (0.08–0.4 ng) were found, about twenty-fold lower than those reported previously. The method was applied to identify and determine the content of flavonoids in an orange juice sample. Copyright © 1999 John Wiley & Sons, Ltd." @default.
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- W1987771657 date "1999-12-15" @default.
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- W1987771657 title "Validation of a liquid chromatography ionspray mass spectrometry method for the analysis of flavanones, flavones and flavonols" @default.
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- W1987771657 doi "https://doi.org/10.1002/(sici)1097-0231(19991215)13:23<2399::aid-rcm805>3.0.co;2-n" @default.
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