摘要:

The chemical composition of the essential oil of a new Citrus hybrid, obtained by crossbreeding the diploid Clementine,Citrus clementinaHort. ex Tan., and the tetraploid lemon,C. limon(L.) Burm. f., was analyzed by GC/MS. The 43 components of die essential oil, 40 of which were fully characterized, were grouped in six classes (monoterpene hydrocarbons, oxygenated monoterpenes, sesquiterpenes, aliphatic aldehydes, aliphatic alcohols and esters) for an easier comparison with the oils of the parent species. The new triploid hybrid, whose genetic equipment is closer to that of the tetraploid parent, provides an oil similar to that of lemon, die principal components being limonene, γ-terpinene and β-pinene. The contribution of die diploid parent, clementine, especially widi regard to some oxygenated components, is less evident but not less significant for the aroma of the oil.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698315

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The essential oils obtained by water distillation from the aerial parts, leaves and flowers and leafless stems ofCyclotrichium niveum(Labiatae) were analyzed by GC and GC/MS. The identified components constituted 97.3–98.4% of the oils. Major components were pulegone (32.5–56.4%) and isomenthone (34.2–35.4%).

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698316

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The essential oils obtained from seeds and leaves ofAframomum pruinosumGagnepain from Cameroon have been analyzed by GC and GC/MS. Both samples are completely different; while the leaf oil contains almost similar percentages of mono- and sesquiterpenoids (β-pinene, 31.4%; β-caryophyllene, 25.8%), the fruit oil is characterized by more than 90% of (E)-(R)-nerolidol.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698317

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The composition of the volatile leaf oils ofJuniperus przewalskiiandJ. przewalskiif.pendulaare reported. The oil ofJ. przewalskiicontains moderate amounts of α-pinene (6.9–11.7%), limonene (7.1–11.8%), sabinene (3.3–10.0%), piperitone (3.1–9.0%) and several diterpenes (> 15%). The oil offorma pendulawas dominated by α-pinene (28.6%), sabinene (28.6%) and cedrol (17.2%). The continued recognition of the formapendulais supported by the terpenoid data. A new name combination is made:Juniperus przewalskiiKom. f.pendula(Cheng & L. K. Fu) R. P. Adams & Chu Ge-lin.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698318

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Sixty-two compounds have been characterized by GC/MS and relative retention times in the essential oil ofSenecio ambavilla(Bory) Pers. produced from plant material growing in Réunion (Indian Ocean). The oil was found to be rich in allo-aromadendrene (40%) and α-pinene (14%). While accounting numerically for approximatively third of the total number of compounds present in the oil, the monoterpene compounds contributed less than 23% of the oil content. On the other hand 70% of the oil was sesquiterpenoid in nature. In addition, long chain aldehydes, eremophilane, phytol (a diterpene alcohol) and indene derivatives were also identified as minor constituents.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698319

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The composition of the essential oil from the leaves and flowers ofMonarda citriodoravar.citriodorawas analyzed by GC and GC/MS. Thymol was the dominant component in the oil from both the flowers (61.77%) and leaves (50.69%). The second most imprtant compound of the leaf oil was p-cymene, although yield from the flower oil was lower (4.19%). A more abundant component of the flower oil was γ-terpinene (13.30%), but only a trace of this was detected in the oil from leaves.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698320

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Water distilled essential oils of 23 collections ofOriganum vulgaresubsp.hirtumfrom the Aegean region of Turkey were analyzed by GC and GC/MS. Forty-eight compounds which amounted to 95.09–99.49% of the total components detected were identified. Carvacrol content in the oils varied between 23.43–78.73%.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698321

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The chemical composition of the essential oil of the resin “Ladano,” from the plantCistus incanussubsp.creticus(L.) Heywood, was investigated by GC and GC/MS. Of the 55 compounds detected, 52 were identified, representing 97.42% of the oil. A drimane-type sesquiterpene hydrocarbon was identified as a new constituent of the oil. The manoyl oxide isomers were also isolated as a mixture, and one of them was characterized as ent-13-epi-manoyl oxide. Structural elucidations were performed by spectroscopic analysis, including1H-NMR,13C-NMR, DEPT, IR and MS techniques.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698322

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The glycosidically bound volatile compounds of the black spruce,Picea mariana, from the Saguenay region of Québec, were analyzed using both Kovats indices and GC/MS. We identified 30 compounds including the phenol 4-hydroxy-3-methoxyacetophenone as the major component (27%) followed by the terpenol linalool (20%). The relative amount of the components varies depending on the hydrolyzing enzyme. Monoterpene alcohols are an important part of the aglycone mixture in the black spruce as compared to other Coniferae species.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698323

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Field investigations were carried out during 1987 and 1988 to compare cultural and chemical control of broad leaf and grass weeds present in the first and second harvest of Japanese mint. Unrestricted weed growth significantly reduced mint oil yield by 58% and 73%, respectively in the first and second harvests. Preemergence applications of terbacil (1.5 kg a.i./ha), pendimethalin (1.0 kg a.i./ha) or oxyfluorfen (0.25 kg a.i./ha) followed by application of fluazifopbutyl (0.25 kg a.i./ha) after first harvest were found to be highly effective in reducing weed density and dry weight and gave oil yield comparable to weed-free check. Applications of diuron (0.75 kg a.i./ha) or oxadiazon (0.25–0.50 kg a.i./ha) were less effective in weed control. None of the herbicides impaired the quality of Japanese mint oil measured in terms of menthol content. Successive weeding, hoeing and mulching (wheat straw 5 t/ha) also gave an oil yield equivalent to that of the weed-free control.

ISSN:1041-2905    

DOI:10.1080/10412905.1994.9698324

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor