Showing papers on "Terpene published in 1990"
TL;DR: In this paper, the terpenes present in cocoa flavour were analyzed by means of gas chromatography-mass spectrometry, and the pyranoid linalool oxides, ocimene and nerolidol were identified for the first time as cocoa volatiles.
Abstract: The terpenes present in cocoa flavour were analysed by means of gas chromatography-mass spectrometry. The pyranoid linalool oxides, ocimene and nerolidol, were identified for the first time as cocoa volatiles. Linalool, which is the major terpene component in cocoa contributes markedly to the flowery and tea-like flavour of some cocoa varieties. Flavour grade beans contain relatively high concentrations of linalool and basic grade cocoas possess. The isolation of linalool by means of intensive (simultaneous distillation extraction) and more gentle methods (vacuum condensation) yields similar quantitative results. The estimation of the concentration ratio of linalool/benzaldehyde within steam distillates ist suitable for the industrial quality control of unroasted cocoas.
52 citations
TL;DR: The chemical composition of the leaf oils of Juniperus excelsa obtained from trees growing in northern Greece and Kew gardens have been compared as mentioned in this paper, and the results show that the leaves of J. excelsa are dominated by cedrol (28.1%), α-pinene (22.5%), with moderate amounts of δ-3-carene (2.3%), myrcene (1.9%), and two unidentified constituents.
Abstract: The chemical composition of the leaf oils of Juniperus excelsa obtained from trees growing in northern Greece and Kew gardens have been compared. The leaf oil from native (Greek) J. excelsa is dominated by cedrol (28.1%), α-pinene (22.5%) and limonene (22.7%), with moderate amounts of δ-3-carene (2.3%), myrcene (1.9%) and two unidentified constituents. The oil from the cultivated juniper at Kew is also dominated by cedrol (40.0%) and α- pinene (46.2%), whereas limonene is small (1.3%). Sixty three of the 67 constituents have been identified.
25 citations
TL;DR: In vitro cultures of the liverwort, Fossombronia pusilla, have been ititiated from spores and 7 terpenes were identified by GC/MS, a petrol ether extract and the isolatedTerpenes exerted antibacterial activity.
Abstract: In vitro cultures of the liverwort, Fossombronia pusilla, have been ititiated from spores. They grew well on Gamborg B5 medium supplemented with 2% saccharose and 12.5 micrograms/l vitamin B12. Undifferentiated cultures were obtained on Knop mineral solution with 4% glucose. The cultures produced the same constituents as collected material. Perrottetianal A and B, known substances from liverworts were isolated and characterized by spectroscopic methods as well as alpha-(-)-santonin. A hitherto unknown diterpene dialdehyde-8-hydroxy-9-hydroperrottetianal A--could also be characterized. Furthermore, 7 terpenes were identified by GC/MS. A petrol ether extract and the isolated terpenes exerted antibacterial activity.
24 citations
TL;DR: In this article, the cembranoids of a Sarcophyton sp. soft coral, collected in Okinawa, were found to be composed predominantly of dihydrofuranocembranoid derivatives (2, 3, 5a, 6 and 7) together with a hydrocarbon cembrene C (1) and a lactonic cembansoid, sarcophytonin B (4).
Abstract: The cembranoids of a Sarcophyton sp. soft coral, collected in Okinawa, were found to be composed predominantly of dihydrofuranocembranoid derivatives (2, 3, 5a, 6 and 7) together with a hydrocarbon cembrene C (1) and a lactonic cembranoid, sarcophytonin B (4). The major constituents sarcophytonin A (2), deoxosarcophine (5a), and sarcophytonin C (6) were shown to be mixtures having similar enantiomeric ratios. The structures of the new compounds (3, 4, 6 and 7) were derived on the basis of spectroscopic studies and chemical correlations. Compounds 3 and 7 were supposed to be artefacts derived from 5a or 6 (3), and from 5a (7) respectively.
18 citations
TL;DR: The biosynthetic pathway of some terpenic hydrocarbons present in the larval osmeterial secretions of Luehdorfia and Papilio species was examined by in vivo experiments, using 13C-labelled acetic acid, substantiating de novo biosynthesis of terpenes from acetate precursors by these larvae.
17 citations
TL;DR: In this article, the prevalence of a C -common core in diverse C terpenes has been recognized and a bifun%onal C I 2-cyclopentanoid deriva% corresponding to this common core has been prepared from R-(+)-limonene.
Abstract: The prevalence of a C - common core in diverse C terpenes has been recognised. A bifun%onal C I 2-cyclopentanoid deriva%:% corresponding to this common-core has been prepared from R-(+)-limonene. The enantiomerically pure 2 has b een e laborated to several sesqui- and diterpene skeleta. In particular, enantioselective syntheses of isodaucane sesquiterpene, (+)-aphanamol-I, 3 and a dolabellane diterpene, 6-araneosene 26 have b een a ccomplished for the first time. A general solution to the stereochemical problem associated w ith t his c lass of compounds has been devised. Syntheses of (-)daucene 8 and (+)-isoamijiol 17 are also described.
15 citations
TL;DR: In this article, a study of the foliage oils of 24 specimens of Halocarpus bidwillii revealed considerable infraspecific variation, including two monoterpene hydrocarbons (α-pinene and myrcene).
12 citations
TL;DR: In this paper, five new alkaloids related to bishordeninyl terpenes, (N, N′ -demethylalfileramine, N, N′-demethylculan-traramine), N, N−isoalfileramines, N −demethylalfileramine and N−methyl-tyraminyl, were isolated from the methanolic extract of the leaves of Zanthoxylum coriaceum.
8 citations
TL;DR: In this paper, the aboveground plant material of Mentha gentilis f. cardiaca (Sm.) Briq was extracted from the ground soil of the Briq plant.
Abstract: Dihydrocarvyl-, Neodihydrocarvyl-; trans-carvyl-, cis-carvyl-and 3-octyl-β-D-glucosides were extracted from the aboveground plant material of Mentha gentilis f. cardiaca (Sm.) Briq. (Scotch spearmi...
8 citations
Journal Article•
TL;DR: In this article, the essential oils from dormant buds of 23 blackcurrant cultivars of a great diversity of parentage and origin were analyzed by capillary gas chromatography, and the abundance of 24 major compounds, i.e. six monoterpene hydrocarbons, eight oxygenated monoterpenes, seven sesquiterpene Hydrocarbons and two oxygenated squiterpenes were used, in correspondence and cluster analyses, to define chemotypes.
Abstract: The essential oils from dormant buds of 23 blackcurrant cultivars of a great diversity of parentage and origin were analyzed by capillary gas chromatography. The abundance of 24 major compounds, i.e. six monoterpene hydrocarbons, eight oxygenated monoterpenes, seven sesquiterpene hydrocarbons and two oxygenated sesquiterpenes were used, in correspondence and cluster analyses, to define chemotypes. Chemotaxonomical formulations are proposed by associating the monoterpene hydrocarbons-, oxygenated monoterpene-, sesquiterpene hydrocarbons- and oxygenated sesquiterpene chemotypes
6 citations
Patent•
06 Jul 1990TL;DR: In this article, the terpene hydroquinone known as aureol has been found to have strong antiviral activity in the marine sponge Stronglophora hartmanii.
Abstract: Novel terpene hydroquinones have been isolated from the marine sponge Stronglophora hartmanii. These compounds have been found to have antiviral activity. Thus, these compounds, and derivatives thereof, can be used to treat viral infections. Additionally, the subject invention concerns the discovery that the terpene hydroquinone known as aureol has strong antiviral activity.
TL;DR: In this article, the prevalence of a C -common core in diverse C terpenes has been recognized and a bifun%onal C I 2-cyclopentanoid deriva% corresponding to this common core has been prepared from R-(+)-limonene.
Abstract: The prevalence of a C - common core in diverse C terpenes has been recognised. A bifun%onal C I 2-cyclopentanoid deriva%:% corresponding to this common-core has been prepared from R-(+)-limonene. The enantiomerically pure 2 has b een e laborated to several sesqui- and diterpene skeleta. In particular, enantioselective syntheses of isodaucane sesquiterpene, (+)-aphanamol-I, 3 and a dolabellane diterpene, 6-araneosene 26 have b een a ccomplished for the first time. A general solution to the stereochemical problem associated w ith t his c lass of compounds has been devised. Syntheses of (-)daucene 8 and (+)-isoamijiol 17 are also described.