RESUMO
The structures of three novel saponins from Argania spinosa, named arganines G, H, and J, have been elucidated by MS and NMR techniques as 3-O-beta-D-apiofuranosyl- (1-->4)-beta-D-glucopyranosyl-28-O-beta-D-glucopyranosylbayogenin (1), 3-O-beta-D-apiofuranosyl-(1-->4)-beta-D-glucopyranosyl-28-O-alpha- L- arabinopyranosylbayogenin (2), and 3-O-beta-D-apiofuranosyl-(1-->4)-beta-D-glucopyranosyl-28-O- [beta-D-apiofuranosyl-(1-->3)-beta-D-xylopyranosyl-(1-->4)-alpha-L - rhamnopyranosyl-(1-->2)-alpha-L-arabinopyranosyl]bayogenin (3), respectively.
Assuntos
Ácido Oleanólico/análogos & derivados , Saponinas/química , Árvores/química , Sequência de Carboidratos , Dados de Sequência Molecular , Marrocos , Saponinas/isolamento & purificaçãoRESUMO
Two novel triterpenoid saponins named sideroxyloside B and sideroxyloside C were isolated from the root of Sideroxylon foetidissimum. On the basis of spectroscopic and chemical methods, their structures were established as 3-O-beta-D-glucopyranosyl-28-O([beta-D-apiofuranosyl-(1-->3)-beta- D- xylopyranosyl-(1-->4)-alpha-L-rhamnopyranosyl-(1-->4)] [beta-D-apiofuranosyl(1-->3)]-alpha-L-rhamnopyranosyl-(1-->2)-alph a-L- arabinopyranosyl) protobassic acid and 28-O([beta-D-xylopyranosyl-(1-->4)- alpha-L-rhamnopyranosyl-(1-->4)] [beta-D-apiofuranosyl-(1-->3)]-alpha-L- rhamnopyranosyl-(1-->2)-alpha-L-arabinopyranosyl) protobassic acid, respectively.
Assuntos
Raízes de Plantas/química , Saponinas/química , Árvores/química , Triterpenos/química , Configuração de Carboidratos , Sequência de Carboidratos , Espectroscopia de Ressonância Magnética , Modelos Estruturais , Dados de Sequência Molecular , Estrutura Molecular , Rotação Ocular , Saponinas/isolamento & purificação , Espectrometria de Massas de Bombardeamento Rápido de Átomos , Triterpenos/isolamento & purificaçãoRESUMO
Three novel saponins, mabiosides C-E, were isolated from the bark of Colubrina elliptica together with the known mabioside B and [alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranosyl-(1-->3)-alpha-L- arabinopyranosyl]-(1-->3)-jujubogenin. All the structures were established by spectroscopic methods.