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<dc:title xml:lang="fr">Contribution à l'étude phytochimique d'orchidées tropicales : identification des constituants d'Aerides rosea et d'Acampe rigida : techniques analytiques et préparatives appliquées à Vanda coerulea et Vanda teres</dc:title>
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<dc:subject xml:lang="fr">Orchidacées</dc:subject>
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<dc:subject xml:lang="fr">Dérivés phénanthréniques</dc:subject>
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<dc:subject xml:lang="en">Phenanthrene derivatives</dc:subject>
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<dcterms:abstract xml:lang="fr">L’analyse de la composition chimique de deux orchidées de la sous-tribu des Aeridinae, Aerides rosea Lodd. ex. Lindl. &amp; Paxton et Acampe rigida (Buch.-Ham. ex Sm.) P. F. Hunt, a été menée en ayant recours à des techniques de couplages et grâce à une stratégie de déréplication. Dix dérivés phénanthréniques ont ainsi été identifiés dans les tiges d’A. rosea, dont deux nouvellement décrits. Quatre stilbénoïdes, trois dérivés d'acides phénoliques et quatre esters d'acide cinnamique ont été identifiés dans les tiges d’A. rigida. Nous avons également effectué des dosages de traceurs dans différents échantillons de deux représentants de la tribu des Vandeae : Vanda teres (Roxb.) Lindl. et Vanda coerulea Griff. ex. Lindl., afin de mettre en évidence d’éventuelles variations de composition en fonction des facteurs environnementaux et du stade de croissance végétative. Enfin, nous avons mis au point des conditions d’isolement préparatif par chromatographie de partage centrifuge afin de purifier des marqueurs biologiques préalablement identifiés dans les tiges de Vanda teres : trois glucospyranosyloxybenzyl - malates ainsi que leur précurseur biosynthétique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Phytochemical analyses of the composition of two orchids Aeridinae subtribe, Aerides rosea Lod . ex . Lindl . &amp; Paxton and Acampe rigida (Buch. -Ham . Ex Sm.) P. F. Hunt were conducted using the state-of-the-art hyphenated techniques and a developed dereplication strategy. Ten phenanthrene derivatives have been identified in the stems of A. rosea, including two newly described structures. Four stilbenoids, three phenolic acids derivatives and four cinnamic acid esters were identified in the stems of A. rigida. We also performed quantitative assays of chemical tracers in different samples of two representative species from the Vandeae tribe: Vanda teres (Roxb.) Lindl. and Vanda coerulea Griff. ex. Lindl., in the aim to highlight possible variations in their composition, depending on environmental factors and vegetative growth stage. Finally, we have developed conditions for preparative isolation using centrifugal partition chromatography to purify biomarkers previously identified in the stems of Vanda teres: three glucosyloxybenzyl malates derivatives and their biosynthetic precursor.</dcterms:abstract>
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