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Registros recuperados: 9
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Anthocyanin characterization of pilot plant water extracts of Delonix regia flowers Inra
Adje, F.; Lozano, Y.F.; Meudec, E.; Lozano, P.; Adima, A.; N'zi, G.A.; Gaydou, E.M..
Following the development of new applications of pilot plant scale extraction and formulation processes for natural active bioproducts obtained from various under-utilized tropical plants and herbs, we have manufactured water-extracts from Delonix regia flowers, grown in Ivory Coast. These extracts, which contain polyphenols, are traditionally home made and used as healthy bioproducts. They are reddish-coloured due to the presence of anthocyanins. The three major anthocyanins in these extracts have been characterized. The molecular structures were confirmed by LC-SM analysis. Amongst them, two are described for the first time in Delonix regia
Tipo: Journal Article Palavras-chave: DELONIX REGIA; POINCIANA REGIA; ANTHOCYANIN; POLYPHENOL; EXTRACT; BIODIVERSITY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20101b7d9f8f&uri=/notices/prodinra1/2010/09/
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Characterisation of highly polymerised prodelphinidins from skin and flesh of four cashew apple (Anacardium occidentale L.) genotypes Inra
Michodjehoun-Mestres, L.; Souquet, J.M.; Fulcrand, H.; Meudec, E.; Reynes, M.; Brillouet, J.M..
Tannins were extracted by acetone/water 60:40 from skin and flesh of four cashew apple genotypes from Brazil and Benin (West Africa), and separated from monomeric phenols. Tannins were submitted to acid-catalysed degradation in the presence of phloroglucinol and the products were analysed by HPLC-DAD/ESI-MS. Both skin and flesh tannins contained high percentages of (-)-epigallocatechin and (-)epigallocatechin-O-gallate, followed by minor quantities of (-)-epicatechin and (-)-epicatechin-3-O-gallate; 100% of the compounds were the 23-cis configuration. Skin tannins were half as galloylated (similar to 20%) than flesh tannins (similar to 40%). Their weight-average molecular weight (M-w) was high
Tipo: Journal Article Palavras-chave: CASHEW APPLE; PSEUDO FRUIT; SKIN; FLESH; TANNIN; PRODELPHINIDIN; EPIGALLOCATECHIN; SIZE-EXCLUSION CHROMATOGRAPHY; TANNASE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f4002907&uri=/notices/prodinra1/2010/08/
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Demonstration of the occurrence of flavanol–anthocyanin adducts in wine and in model solutions Inra
Salas, E.; Atanasova, V.; Poncet-Legrand, C.; Meudec, E.; Mazauric, J.P.; Cheynier, V..
Flavanol-anthocyanin (F-A(+)) adducts were detected in red wine. A mechanism involving acid-catalysed cleavage of flavanol oligomers followed by nucleophilic addition of the anthocyanin moiety (in its hemiketal form) to the resulting carbocation (F+) was postulated. To confirm this mechanism, reactions between malvidin3-O-glucoside (Mv3glc) and procyanidin dimerepicatechin-(4-8)-epicatechin 3-O-gallate (B2-3'OG) were studied in a model solution system at pH 2. A new pigment with a UV-Vis spectrum similar to that of Mv3glc and a signal at m/z = 781 in the positive ion mode was detected and was attributed to Ec-Mv3glc, in agreement with the proposed reaction pathway
Tipo: Journal Article Palavras-chave: ANTHOCYANIN; FLAVANOL; PROCYANIDIN; ADDUCT; PIGMENT; THIOLYSIS; MODEL SOLUTION; WINE; HPLC/MS.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20086878f1cf&uri=/notices/prodinra1/2009/02/
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Direct mass spectrometry approaches to characterize polyphenol composition of complex samples Inra
Fulcrand, H.; Mane, C.; Preys, S.; Mazerolles, G.; Bouchut, C.; Mazauric, J.P.; Souquet, J.M.; Meudec, E.; Li, Y.; Cole, R.B.; Cheynier, V..
Lower molecular weight polyphenols including proanthocyanidin oligomers can be analyzed after HPLC separation on either reversed-phase or normal phase columns. However, these techniques are time consuming and can have poor resolution as polymer chain length and structural diversity increase. The detection of higher molecular weight compounds, as well as the determination of molecular weight distributions, remain major challenges in polyphenol analysis. Approaches based on direct mass spectrometry (MS) analysis that are proposed to help overcome these problems are reviewed. Thus, direct flow injection electrospray ionization mass spectrometry analysis can be used to establish polyphenol fingerprints of complex extracts such as in wine. This technique...
Tipo: Journal Article Palavras-chave: MASS SPECTROMETRY; PHENOLIC COMPOUND; PROANTHOCYANIDIN.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200927660e8f&uri=/notices/prodinra1/2010/08/
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Isolation of Carignan and Merlot red wine oligosaccharides and their characterization by ESI-MS Inra
Ducasse, M.A.; Williams, P.; Meudec, E.; Cheynier, V.; Doco, T..
The oligosaccharides of Carignan and Merlot wines have been characterized for the first time. In a first step, this fraction was prepared after discoloration of the wines and was collected by elution on an HPSEC system. In a second step, the glycosyl composition and linkages of wine oligosaccharides were determined by several methods. High resolution MS spectra of the Carignan and Merlot oligosaccharide fractions were obtained on an AccuTOF mass spectrometer equipped with an electrospray ionization (ESI) source and a time-of-flight (TOF) mass analyser.Oligosaccharides were present at a concentration of 330 and 250 mg/L in Carignan and Merlot red wines, respectively. Glycosyl residue composition analysis showed the presence of mannose, arabinose, galactose,...
Tipo: Journal Article Palavras-chave: WINE; OLIGOSACCHARIDE; CARIGNAN; MERLOT; ESI-TOF; GLUCURONOXYLAN; OLIGOGALACTURONIC ACID; OLIGORHAMNOGALACTURONIC ACID.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010d685164d&uri=/notices/prodinra1/2010/08/
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Mass spectrometric evidence for the existence of oligomeric anthocyanins in grape skins Inra
Vidal, S.; Meudec, E.; Cheynier, V.; Skouroumounis, G.; Hayasaka, Y..
The fractionation of a grape skin extract by multilayer countercurrent chromatography coupled with step gradient elution allowed the preparation of a fraction almost devoid of free anthocyanins. This fraction appeared to be almost exclusively polymeric, as judged by liquid chromatographic-mass spectrometric (LC-MS) analysis, color-bleaching tests with sulfur dioxide, and thiolysis. Electrospray mass spectrometric analysis indicated that the pigmented material in this fraction was chiefly composed of direct condensation products of anthocyanin extending up to trimers. With regard to their linkages, the anthocyanin units in the oligomers were possibly linked by either an A-type (by both carbon-carbon and ether bonds) or B-type (by carbon-carbon bond)...
Tipo: Journal Article Palavras-chave: GRAPE SKIN; ANTHOCYANIN OLIGOMER; ANTHOCYANIN; MULTILAYER COIL COUNTERCURRENT CHROMATOGRAPHY; ELECTROSPRAY MASS SPECTROMETRY.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200891a8f1a8&uri=/notices/prodinra1/2009/03/
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New compounds obtained by evolution and oxidation of malvidin 3-O-glucoside in ethanolic medium Inra
Es-Safi, N.E.; Meudec, E.; Bouchut, C.; Fulcrand, H.; Ducrot, P.H.; Herbette, G.; Cheynier, V..
Two new colorless phenolic compounds were formed from malvidin 3-O-glucoside incubated in an ethanolic solution. Their structures were characterized by means of one- and two-dimensional NMR analysis and through electrospray ionization-mass spectrometry. As compared to the structure of the initial anthocyanin skeleton, the first new compound showed the presence of two fused five-membered rings replacing the pyran ring and of a carbonyl function on the 2-position. The first five-membered ring was shown to result from the formation of a new linkage between the B ring 6'-position and the C ring 4-position, while the second was a dihydro furan ring with an oxygenated ether linkage between the 8a-position and the 37-position. The second isolated compound was...
Tipo: Journal Article Palavras-chave: POLYPHENOL; ANTHOCYANIN; MALVIDIN 3-O-GLUCOSIDE; REACTION; PRODUCT CHARACTERIZATION; MASS SPECTROMETRY; NMR.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200883f712ee&uri=/notices/prodinra1/2009/02/
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New insights into gamma-aminobutyric acid catabolism: evidence for gamma-hydroxybutyric acid and polyhydroxybutyrate synthesis in Saccharomyces cerevisiae Inra
Bach, B.; Meudec, E.; Lepoutre, J.P.; Rossignol, T.; Blondin, B.; Dequin, S.; Camarasa, C..
The gamma-aminobutyrate (GABA) shunt, an alternative route for the conversion of alpha-ketoglutarate to succinate, involves the glutamate decarboxylase Gad1p, the GABA transaminase Uga1p and the succinate semialdehyde dehydrogenase Uga2p. This pathway has been extensively described in plants and animals, but its function in yeast remains unclear. We show that the flux through Gad1p is insignificant during fermentation in rich sugar-containing medium, excluding a role for this pathway in redox homeostasis under anaerobic conditions or sugar stress. However, we found that up to 4 g of exogenous GABA/liter was efficiently consumed by yeast. We studied the fate of this consumed GABA. Most was converted into succinate, with a reaction yield of 0.7 mol/mol. We...
Tipo: Journal Article Palavras-chave: SUCCINATE; PHYSIOLOGIE INTEGRATIVE; METABOLISME CENTRAL.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20106df112ac&uri=/notices/prodinra1/2010/08/
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Polyphenol-beta-casein complexes at the air/water interface and in solution: effects of polyphenol structure Inra
Aguié-Beghin, V.; Sausse, P.; Meudec, E.; Cheynier, V.; Douillard, R..
The interactions between proteins and plant polyphenols are responsible for astringency and haze formation in beverages and may participate in foam stabilization. The effect of phenolic compounds with different structures, namely, catechin (C), epicatechin (Ec), epigallocatechin (Egc), epicatechin gallate (EcG), and epigallocatechin gallate (EgcG), on the surface properties at the air/liquid interface of P-casein, chosen as model protein, were monitored by tensiometry and ellipsometry. The formation of complexes in the bulk phase was measured by electrospray ionization mass spectrometry (ESI-MS). Adsorption of polyphenols from pure solution was not observed. Surface pressure, surface concentration, and dilational modulus of the protein adsorption layer...
Tipo: Journal Article Palavras-chave: ADSORPTION KINETIC; ADSORPTION LAYER; BETA-CASEIN; POLYPHENOL; PROTEIN POLYPHENOL INTERACTION; SPECTROSCOPIC ELLIPSOMETRY; DROP TENSIOMETER; ELECTROSPRAY IONIZATION SPECTROMETRY (ESI-MS); AIR/LIQUID INTERFACE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20098a7ddb68&uri=/notices/prodinra1/2010/08/
Registros recuperados: 9
Primeira ... 1 ... Última
 

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