No abstract

A detailed study of the essential oil from the wood of Juniperus oxycedrus L. allowed the identification of 42 components, 15 of them being reported the first time in this oil.

The absolute prepared from an Indian commercial concrete from flowers of Jasminum auriculatum Vahl was examined. Column and molecular distillations, column chromatography and chemical function separations were carried out. GC-MS and GC-FTIR of numerous fractions thus obtained allowed the identification of 198 compounds. Among them, methyl, ethyl, (Z)-hex-3-enyl, benzyl, 2-phenylethyl and (E,E)-farnesyl esters were found, in addition to phenols and nitrogen compounds.KEY WORDS Jasminum auriculatum Vahl; Oleaceae; INTRODUCTION Jasminum auriculatumVahl is a small shrub, approximately l m to 1.5m high, which grows in India and looks like J. grandifIorurn L. The white flowers are collected from cultivated plants from April to August. They give off a powerful and typical jasmine odour, and they are almost exclusively used for ornamental purposes, medicines' and perfumery.2 The production and perfume potential of J. auriculatum has been discussed by Singh and More.3 The leaves of this plant have been the subject of some analytical whereas n o in-depth investigation has been published so far on the volatile fraction of any extract from the flowers. Indeed, the hexane extract of J. auriculatum flowers has been fully characterized.' EXPERIMENTAL Plant Material and Isolation ProcedureA commercial hexane concrete of Indian origin was supplied by Fragrance India Private, Ltd (Madras). It was treated with 95% ethanol according to the standard procedure, to afford an absolute in 46.7% yield.As depicted in Scheme 1, various vacuum distillation procedures were used in order to separate as many volatile compounds as possible, with minimal risk of degradation of sensitive com- absolute; volatiles; GC-MS; GC-FTIRponents. The absolute (185 g) was fractionated in a Vigreux distillation column, to afford a distillate A (25.28) and residue A.Residue A was then submitted to molecular distillation, which afforded a distillate MD1 (45.8g) at 1OO"C, a distillate MD2 (36.9g) at 120"C, a liquid nitrogen trap fraction (7g) and a MD residue (65g). With the exception of distillate MD2, the distillates were combined and submitted first to chemical function separations, then to column chromatography. Distillate MD2 was directly fractionated by silica gel column chromatography. All the fractions were analysed by gas chromatography and those which revealed characteristic peaks were analysed by GC-MS and, some of them, by GC-FTIR. Gas ChromatographyThe fractions obtained as described above were analysed using a Hewlett-Packard 5890 gas chromatograph equipped with a FID.Analytical conditions were: a fused-silica column (50m x 0.32mm i.d.) coated with methyl silicone SE-30 (film thickness: 0.3 pm); hydrogen as carrier gas, gas flow of 2 ml/min at room temperature; the oven temperature was held at 60°C for 10 min, then raised to 270°C at 2"C/min. Injector temperature: 250°C. Detector temperature: 270°C.

No abstract

The volatile flavor components of Mobola plum (Parinari curatellifolia), a native fruit of Southern Africa, have been isolated by a vacuum headspace concentration method. The concentrate was analyzed by hyphenated gas chromatographic techniques, including gas chromatography (GC)/mass spectrometry (MS) and GC/Fourier transform infrared (FTIR), together with other GC-coupled detection devices for the specific and selective detection of nitrogen- and sulfur-containing compounds. A total of 88 components were identified. Of these compounds, 12 contain nitrogen, including 2-aminobenzaldehyde and phenylacetaldoxime, which are detected for the first time in an edible fruit. In addition, two unusual nitrated compounds have been identified, including optically active (2-nitrobutyl)benzene, which is a new natural product. Quantitative and sensory data of the new compounds are provided.