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<dc:title xml:lang="fr">Stilbénoïdes et dérivés glucosyloxybenzyliques d’acides organiques isolés d’orchidées tropicales : études chimiques et biologiques de Cyrtopodium paniculatum (Ruiz &amp; Pav.) Garay et Arundina graminifolia (D.Don) Hochr.</dc:title>
<dcterms:alternative xml:lang="en">Stilbenoids and glucosyloxybenzyl derivatives of organic acids isolated from tropical orchids : chemical et biological studies of Cyrtopodium paniculatum (Ruiz &amp; Pav.) Garay and Arundina graminifolia (D.Don) Hochr</dcterms:alternative>
<dc:subject xml:lang="fr">Orchidacées</dc:subject>
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<dc:subject xml:lang="fr">Stilbénoïdes</dc:subject>
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<dc:subject xml:lang="fr">Dérivés glucosyloxybenzyliques d’acides organiques</dc:subject>
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<dc:subject xml:lang="fr">Chimiodiversité</dc:subject>
<dc:subject xml:lang="en">Orchidaceae</dc:subject>
<dc:subject xml:lang="en">Cyrtopodium paniculatum</dc:subject>
<dc:subject xml:lang="en">Arundina graminifolia</dc:subject>
<dc:subject xml:lang="en">Stilbenoids</dc:subject>
<dc:subject xml:lang="en">Orchidatabase</dc:subject>
<dc:subject xml:lang="en">Glucosyloxybenzyl derivatives of organic acids</dc:subject>
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<dc:subject xml:lang="en">Chemodiversity</dc:subject>
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<dcterms:abstract xml:lang="fr">Nous avons porté une attention particulière à 2 marqueurs chimiotaxonomiques de la famille botanique des orchidées, les stilbénoïdes et dérivés glucosyloxybenzyliques d’acides organiques, et les avons recherchés dans deux espèces tropicales. L’investigation phytochimique de Cyrtopodium paniculatum (Ruiz &amp; Pav.) Garay a permis l’isolement de 35 stilbénoïdes dont 12 nouvellement décrits. L’évaluation de leur activité cytotoxique in vitro sur la lignée cellulaire cancéreuse UG-87 montre que seuls les stilbénoïdes dimères semblent aptes à induire une perturbation de l’intégrité cellulaire. Nous avons également exploré la composition chimique d’Arundina graminifolia (D.Don) Hochr. De ses parties aériennes, 9 stilbénoïdes (dont 2 nouvelles structures ont été isolés) ainsi que des 7 nouveaux dérivés hydroxybenzyliques de l’acide (R) 2-benzylmalique, les arundinosides. De ses parties souterraines, plus de 40 arundinosides ont également pu être identifiés. Nous avons finalement évalué le potentiel cytoprotecteur de stilbénoïdes et arundinosides d’ A. graminifolia sur lignée cellulaire PC12, sans qu’aucune activité relevée n’ait été concluante.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The aim of the study was focused on two chemotaxonomic markers of the family Orchidaceae, namely stilbenoids and the glucosyloxybenzyl derivatives of organic acids. We specifically explored these two chemical families in two tropical orchid species. The chemical investigation of Cyrtopodium paniculatum (Ruiz &amp; Pav.) Garay led to the isolation of 35 stilbenoids, including 12 newly described compounds. Their cytotoxic activity on UG-87 cancer cell line was evaluated. The result obtained demonstrated that stilbenoids dimers were the only compounds capable of disturbing the cellular integrity. In parallel, we explored the chemical composition of Arundina graminifolia (D.Don) Hochr. From its aerial parts, 9 stilbenoids (including 2 newly described ones) together with 7 new (R) glucosyloxybenzyl 2-benzylmalate derivatives, the arundinosides, were isolated. From its underground parts, over 40 arundinoside-like compounds have also been identified. The cytoprotective evaluation of stilbenoids and arundinosides against beta-amyloid induce toxicity on PC12 cells was evaluated, however, no significant result was obtained from the biological evaluation.</dcterms:abstract>
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