Composition and Chemical Variability of Ivoirian Xylopia staudtii Leaf Oil.

The chemical composition of a leaf oil sample from Ivoirian Xylopia staudtii Engler & Diels (Annonaceae) has been investigated by a combination of chromatographic [GC(RI)] and spectroscopic (GC-MS, 13C NMR) techniques. Thirty-five components that accounted for 91.8% of the whole composition have been identified.

Glycosidase inhibitors from the roots of Glyphaea brevis.

Ten phenylalkyl-substituted iminosugars (1-10) and a cinnamic acid derived glucoside (11) were isolated from the roots of Glyphaea brevis (Malvaceae). Their structures were elucidated by 1D and 2D NMR analysis, as well as by HR-ESIMS. Compounds 1-10 retain an unprecedented structure composed of an iminosugar-like core identified as 1-deoxyfuconojirimycin in glyphaeaside A1-A4 (1, 2, 5, 6), 1-deoxygalactonojirimycin in glyphaeaside B1-B5 (3, 4, 7-9) or 1-deoxynojirimycin in glyphaeaside C (10), substituted by a β-d-glucopyranose in compounds 2, 4, 6 and 9.

Chemical variability of Cleistopholis patens (Benth.) Engl. et Diels leaf oil from ivory coast.

The chemical composition of 48 leaf oil samples isolated from individual plants of Cleistopholis patens (Benth.) Engl. et Diels harvested in four Ivoirian forests was investigated by GC-FID (determination of retention indices), GC/MS, and (13) C-NMR analyses.

Analysis of Cleistopholis patens leaf and trunk bark oils using combined GC- flame ionisation detection, GC-retention index, GC-MS and (13) C-NMR.

Introduction: Germacrenes A-C are secondary metabolites produced by various plants. They are sesquiterpene hydrocarbons bearing the (E,E)-1,5-cyclodecadiene structure known to undergo thermal rearrangement through a [3.3]-sigmatropic reaction.

Three new natural compounds from the root bark essential oil from Xylopia aethiopica.

Introduction: In the course of on-going work on the characterisation of aromatic plants from the Ivory Coast we investigated the composition of the root oil from Xylopia aethiopica.

Objectives: The aim of this work was to investigate the chemical composition of X. aethiopica root oil and elucidate the structure of two new compounds.