Journal ArticleDOI
Approach to the study of C‐glycosyl flavones by ion trap HPLC‐PAD‐ESI/MS/MS: application to seeds of quince (Cydonia oblonga)
TLDR
Ion trap HPLC-PAD-ESI/MS/MS has been used to study C-glycosyl flavones in quince seeds and deductions were made about the nature of the sugar units and the positions of C- Glycosylation.Abstract:
Ion trap HPLC-PAD-ESI/MS/MS has been used to study C-glycosyl flavones in quince seeds. Comparative analysis of the ions [(M-H)-60]-, [(M-H)-90]- and [(M-H)-120]- from 6-C- and 8-C-glycosyl flavone isomers, together with their respective retention times, allowed deductions to be made about the nature of the sugar units and the positions of C-glycosylation. Vicenin-2 (6,8-di-C-glucosyl apigenin), lucenin-2 (6,8-di-C-glucosyl luteolin), stellarin-2 (6,8-di-C-glucosyl chrysoeriol), isoschaftoside (6-C-arabinosyl-8-C-glucosyl apigenin), schaftoside (6-C-glucosyl-8-C-arabinosyl apigenin), 6-C-pentosyl-8-C-glucosyl chrysoeriol and 6-C-glucosyl-8-C-pentosyl chrysoeriol were identified in quince seed.read more
Citations
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Journal ArticleDOI
Flavonoid composition of Citrus juices.
TL;DR: Analytical techniques for the characterization of juices from different Citrus fruits regarding their flavonoid content (even if present in only trace amounts), concentrating on the most widely used methods (LC-MS and LC-MS-MS).
Journal ArticleDOI
Characterization and Quantitation of Antioxidant Constituents of Sweet Pepper (Capsicum annuum L.)
TL;DR: Hydxycinnamic derivatives, O-glycosides of quercetin, luteolin, and chrysoeriol, and a large number of C-glyCosyl flavones have been characterized and found for the first time in nature.
Journal ArticleDOI
Quince (Cydonia oblonga Miller) fruit (pulp, peel, and seed) and jam: Antioxidant activity
Branca M. Silva,Paula B. Andrade,Patrícia Valentão,Federico Ferreres,Rosa M. Seabra,Margarida A. Ferreira +5 more
TL;DR: The evaluation of the antioxidant activity of methanolic extracts showed that peel extract was the one presenting the highest antioxidant capacity, which seems to indicate that the phenolic fraction gives a higher contribution for the antioxidant potential of quince fruit and jam.
Journal ArticleDOI
Determination of antioxidant activity in free and hydrolyzed fractions of millet grains and characterization of their phenolic profiles by HPLC-DAD-ESI-MSn
TL;DR: In this article, the authors used high performance liquid chromatography (HPLC) and HPLC-tandem mass spectrometry (MSn) to identify 50 phenolic compounds belonging to several classes, namely, phenolic acids and their derivatives, dehydrodiferulates and dehydrotriferulates, flavan-3-ol monomers and dimers, flavonols, flavones and flavanonols in four phenolics fractions of several whole millet grains (kodo, finger (Ravi), finger (local), foxtail, proso, little
Journal ArticleDOI
Changes in antioxidant phytochemicals and volatile composition of Camellia sinensis by oxidation during tea fermentation
TL;DR: In this article, the authors observed non-volatile phytochemicals including polyphenolic and volatile compounds changes by oxidation under strict processing control and evaluated the degree of fermentation for the maximum antioxidant capacity with the same tea material.
References
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Journal ArticleDOI
Evaluation of quadrupole time-of-flight tandem mass spectrometry and ion-trap multiple-stage mass spectrometry for the differentiation of C-glycosidic flavonoid isomers.
Patrice Waridel,Jean-Luc Wolfender,Karine Ndjoko,Kirsten R. Hobby,Hilary J. Major,Kurt Hostettmann +5 more
TL;DR: The collision-induced dissociation MS-MS spectra of ubiquitous C-glycosidic flavonoids have been systematically studied using hybrid quadrupole time-of-flight and ion-trap mass analysers under various CID energy conditions.
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Application of mass spectrometry for identification and structural studies of flavonoid glycosides.
TL;DR: A review of mass spectrometric techniques applied to the identification and structural studies of flavonoid glycosides is presented.
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The application of atmospheric pressure chemical ionisation liquid chromatography-mass spectrometry in the chemotaxonomic study of flavonoids: characterisation of flavonoids from Ocimum gratissimum var. gratissimum.
TL;DR: In this paper, liquid chromatography coupled to mass spectrometry (LC-MS), using atmospheric pressure chemical ionisation (APCI), was found to complement data obtained from diode array detection enabling common flavonoids in Ocimum gratissimum var. gratissimatum to be characterised at the analytical level without complete purification, or even to be characterized in crudely purified ethanolic extracts.
Journal ArticleDOI
Effect of modified atmosphere packaging on the flavonoids and vitamin C content of minimally processed Swiss Chard (Beta vulgaris subspecies cycla)
TL;DR: In this article, five flavonoids from Swiss chard leaves (Beta vulgaris subsp. cycla) were isolated and identified as vitexin 2''-xyloside and its 6'"-malonated derivative.