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Authors: Thierry Buffeteau, Dominique Cavagnat, Jonathan BissonORCID , Axel Marchal, Gilbert D. Kapche, Ilaria Battistini, Gregory Da Costa, Alain Badoc, Jean-Pierre Monti, Jean-Michel Mérillon, Pierre Waffo-Téguo
Journal: Journal of Natural Products (RoMEO status: White)
Subjects: Pharmacognosy Phytochemistry VCD Stereochemistry
Dimeric stilbene glucosides 1–3 [two diastereomers of (−)-gnemonoside A (1a and 1b), (−)-gnemonoside C (2), and (−)-gnemonoside D (3)] as well as a mixture of the two enantiomers of gnetin C (4) were isolated from the rhizomes of Gnetum africanum. The two enantiomers of gnetin C, (+)-4 and (−)-4, were obtained from the aglycones of 1a and 1b, respectively. The configurations of these stilbenoids were investigated by NMR and vibrational circular dichroism (VCD) experiments.
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Authors: Davide Slaghenaufi, Stéphanie Marchand-Marion, Tristan Richard, Pierre Waffo-Téguo, Jonathan BissonORCID , Jean-Pierre Monti, Jean-Michel Mérillon, Gilles de Revel
Journal: Food Chemistry (RoMEO status: Green)
Subjects: CPC Oak Wood Flavor Wine
Flavours extracted from oak wood during barrel ageing contribute to the organoleptic character of wines and spirits. The aim of this work was to identify the glycosidic precursors of the key volatile compounds responsible for oak wood aroma. Oak extract is a very complex matrix and, furthermore, precursors are present in very small quantities. Preparative centrifugal partition chromatography (CPC) is a promising solution for purifying the oak extract. The solvent system was selected on the basis of the partition coefficient of glycosidase enzyme activity (Kca).
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Authors: Alison D. Pawlus, Emma Cantos-Villar, Tristan Richard, Jonathan BissonORCID , Pascal Poupard, Yorgos Papastamoulis, Jean-Pierre Monti, Pierre-Louis Teissedre, Pierre Waffo-Téguo, Jean-Michel Mérillon
Journal: Journal of Chromatography A (RoMEO status: Green)
Subjects: Analytical Chemistry Dereplication LC-NMR Vine Wine
Wine is a major dietary source of numerous potentially health promoting stilbenoids that have been the subject of many qualitative and quantitative studies. However, our initial HPLC–MS analyses of crude wine samples demonstrated the presence of compounds with molecular weights matching characteristic stilbenoid dimers, trimers, and tetramers that were unaccounted for in the literature. Due to the likelihood that these are known compounds, a chemical dereplication method is highly desirable. We developed such a method using LC-DAD–MS monitored fractionation steps, using adsorption and centrifugal partition chromatography (CPC), to obtain fractions rich in stilbenoids for analysis in stopped-flow LC–NMR.
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