Screening for Astragalus hamosus Triterpenoid Saponins Using HPTLC Methods: Prior Identification of Azukisaponin Isomers |
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| Authors: | Khouloud Nafti Geraldine Giacinti Sonia Marghali Christine Delgado Raynaud |
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| Affiliation: | 1.Laboratoire de Chimie Ago-Industrielle (LCA), Université de Toulouse, INRAe, 4 Allée Emile Monso, 31030 Toulouse, France;2.Laboratoire de Génétique Moléculaire, Immunologie et Biotechnologie, Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis 1068, Tunisia;3.Centre d’Application et de Traitement des Agro-Ressources (CATAR), Toulouse-INP, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse, France |
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| Abstract: | Due to their particular structural characteristics, the extraction and isolation of saponins from plants present a serious challenge. In this study, specific extraction protocols were first implemented to extract the secondary metabolites from Astragalus hamosus and, more precisely, the saponins. Subsequent purification of the extracts was based on a single chromatographic technique, high-performance thin-layer chromatography, applying two development systems: a one-step system that separated molecules according to their polarity and a multiple development system that made it possible to detect the triterpenoid saponins, azukisaponin or soyasapogenol at a retarded Rf of 0.2. The difficulties of detecting the Astragalus hamosus saponins encountered during the extraction and purification of the extracts have been highlighted and the strategy carried out to isolate the saponins has been discussed. |
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| Keywords: | Astragalus hamosus HPTLC triterpenoid saponin soyasaponin azukisaponin |
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