No abstract

Essential oils obtained by hydrodistillation from aerial parts of Hedyosmum angustifolium (Ruiz & Pavón) Solms-Laubach and H. scabrum (Ruiz & Pavón) Solms-Laubach from Bolivia were analysed by GC-FID and GC-MS. Monoterpene hydrocarbons, especially˛-andˇ-pinene, and oxygen containing monoterpenes, mainly 1,8-cineole and linalool, were the major constituents found in the oils of H. angustifolium. The oil of H. scabrum was mainly made up of monoterpenes, in particular υ-3-carene, the sesquiterpene hydrocarbons˛-gurjunene and germacrene D, and 3 0 , 4 0 -dimethoxypropiophenone. For both oils, the enantiomeric distribution of -pinene, sabinene,ˇ-pinene, limonene, linalool, terpinen-4-ol and˛-terpineol was studied by multidimensional HRGC-HRGC. The main difference between the oils corresponded to the reverse enantiomeric distribution found for linalool, indicating a clear index of different metabolic response in each species.

Investigation of the volatile fraction from the stem bark of Ocotea opifera Mart. led to the isolation and characterization of asaricin, a phenolic derivative with antifungal and insecticidal activity, as the main component, which is described for the first time for the genus Ocotea. The structure has been established by a study of its mono- and bidimensional NMR spectra and mass spectrometry.

No abstract

Analysis by GC and GC-MS of the essential oil obtained from aerial parts of Erechtites hieracifolia revealed 22 components (93% of the total composition). The major constituents were found to be˛-pinene, myrcene, (E)-ˇ-ocimene, (E)-caryophyllene and germacrene D; the enantiomeric distribution of˛-pinene, sabinene,ˇ-pinene, limonene and linalool was studied by multidimensional HRGC-HRGC. The major component was˛-pinene (48%) with an enantiomeric purity of 100% for (1R)-(C)-˛-pinene.