Chemical composition of leaf and root essential oils of Boenninghausenia albiflora Reichb. from northern India
The leaf and root essential oil composition of Boenninghausenia albiflora Reichb and Meissner (family: Rutaceae), collected from Uttarakhand, India, was analysed by capillary gas chromatography and gas chromatography–mass spectrometry. The major constituents identified in the leaf essential oil were β-myrcene, (Z)-β-guaiene, (Z)-β-ocimene and β-caryophyllene, whereas bicyclogermacrene, α-terpinyl acetate, geijerene and β-copaene-4α-ol were identified as the major constituents of the root essential oil. This is the first time that the chemical compositions of leaf and root essential oils of B. albiflora have been investigated in detail. The results show significant qualitative and quantitative variations in leaf and root oil composition.
Essential leaf oil of Amyris diatrypa Sprengel from the Dominican Republic.
Abstract The essential oil from the leaves of Amyris diatrypa Sprengel (Rutaceae) from the Dominican Republic was analyzed by GC/MS. The oil contains over 80 components. The oil was found to contain a large amount of pregeijerene (17–21%), with moderate amounts of 1,8-cineole (2–21%), linalool (8–10%), geijerene (3-7.7%), sabinene (1.0–9.3%), and (E)-caryophyllene (3.2–5.9%).
Stress metabolites of Solanummelongena: biosynthetic studies and isolation of auberganol and α- and β-eudesmol
Attempts to clarify the biosynthetic origin of the eggplant stress metabolite aubergenone (1) by incorporation of label from sodium [2-2H3,1-13C]acetate were frustrated by low yields and enrichment levels. However, the presence of deuterium in the biosynthetically significant 5-position was demonstrated by 2Hmr for the closely related auberganol (5) and α-and β-eudesmol (10 and 11), suggesting that these compounds, and hence also 1, are normal eudesmanes and not the products of a possible double rearrangement. Deuterium was also incorporated into the expected positions of 9-oxonerolidol (12), 9-oxynerolidol (13), and lubimin (4). Incorporation of label from [1,2-13C2]acetate could be determined satisfactorily only for 13 and its allylic isomer 14, corresponding with expectations. This is the first report of 5 as a natural product and of 10, 11, and the 10-epimer of 4 as eggplant stress metabolites.