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Authors: Yorgos Papastamoulis, Jonathan BissonORCID , Hamza Temsamani, Tristan Richard, Axel Marchal, Jean-Michel Mérillon, Pierre Waffo-Téguo
Journal: Tetrahedron (RoMEO status: Green)
Subjects: Pharmacognosy Phytochemistry Vine Wine Stilbenoids Polyphenols CPC Mass Spectrometry
Stilbenoids have received increasing attention over the last two decades since the discovery of resveratrol in wine. With an ever-growing rhythm, a multitude of biological activities of naturally occurring stilbenes are being reported. In this work, we investigated minor stilbenoid compounds from Vitis vinifera stalks. The compounds were purified by means of centrifugal partition chromatography (CPC), a countercurrent-separation technique. Electrospray ionization–ion trap mass spectrometry (ESI–IT-MS) after optimization proved to be extremely efficient for the detection of these new molecules, providing both structural information for structure elucidation and a means to achieve identification even with minute amounts.
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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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