摘要:

The chemical composition of the steam-distilled wood oil ofSantalum spicatumwas investigated by means of GC/MS. The major constituents of the entirely sesquiterpenoid oil were trans, trans-farnesol (31.6%), epi-α-bisabolol (anymol) (10.7%), α-santalol (9.1%), Z-nuciferol (6.5%), cis-β-santalol (5.4%), cis-lanceol (3.9%) and epi-β-santalol (2.9%).

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697970

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The steam and water distilled oilsof Micromeria congestaBoiss. et Hausskn. ex Boiss. were investigated by GC and GC/MS. Forty compounds were identified making up 91.5% of the steam distilled oil and 93% of the water distilled oil. Major components of the oils were identified as piperitenone oxide (40–45%), pulegone (9.7–11.8%) and verbenone (8.3–9.4%).

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697971

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The composition of the essential oil obtained from the flowers and the leaves ofSideritis mugronensisin two different stages of their reproductive development is described. The major components of the leaf and flower oils were sabinene: 1.30–10.59% and 2.70–15.21%; 1,8-cineole: 11.60–17.19% and 11.06–28.65%; and α-bisabolol: 5.57–25.49% and 3.40–16.12% respectively.

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697972

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The composition of the essential oil from the leavesof Tithonia diversifoliawere studied by capillary gas chromatography. The analysis using a combination of retention indices and combined GC/MS led to the identification of 20 components. The oil contains mainly monoterpenoids (88.2%) out of which 87.4% are monoterpene hydrocarbons and some sesquiterpene hydrocarbons (8%). The major constituent was (Z)-β-ocimene (40.2%).

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697973

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The chemical composition of the essential oils from Brazilian species of the genusAristolochiaare being reported for the first time. The oils, which were obtained by steam distillation from seven BrazilianAristolochiaspecies:A. gigantea, A. macroura, A. cymhifera, A. rodriguesia, A. birostris, A. papillarisand A.triangularis, were analyzed by GC/MS and found to be rich in sesquiterpenes. The major components of the various oils were:—A. birostris:β-caryophyllene (13.9%), α-humulene (16.4%) and germacrene A (13.3%);A. cymhifera:n-undecane (17.7%) and dodecane (12.4%);A. gigantea:β-caryophyllene (8.8–19.3%), germacrene D (16.3–24.9%), γ-elemene (0–21.6%), trans-α-bergamotene (2.3–12.5%), (E)-nerolidol (0–23.4%), linalool (0–14.6%), nerol (0–11.5%) and geraniol (0–26.2%); A.macroura:δ-elemene (1.2–12.4%), α-copaene (2.5–13.3%), β-caryophyllene (10.6–15.3%), α-humulene (15.5–20.5%), γ-elemene (10.4–11.6%) and (E)-nerolidol (0–33.1%), farnesene (12.7%); A.papillaris:calarene (13.6%), α-humulene (17.7%), γ-cadinene (10.9%) and δ-cadinene (10.6%); A.rodriguesia:α-copaene (12.4%), β-bourbonene (11.9%) and β-elemene (10.7%); A.triangularis:(E)-nerolidol (12.3%) and decane (11.8%).

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697974

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The chemical composition of the essential oilof Thymus zygisL. ssp.sylvestris(Hoffm. & Link) Brot. ex Coutinho obtained from spontaneous plants in the center of Portugal was examined chromatographically using Kovats indices and reference compounds as the methods of component identification. A well-marked chemical polymorphism was detected in these essential oils probably due to genetic factors. Seven pure chemotypes (the linalool, thymol, carvacrol, geraniol/geranyl acetate, 1, 8-cineole/linalool, 1, 8-cineole/thymol and the oc-terpineol/α-terpinyl acetate) and two mixed chemotypes (the linalool-thymol and the cineole-linalool-thyrnol) were characterized.

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697975

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The chemical composition of the essential oils of 41 samples ofLippia ukambensisVatke were examined by GC/MS. Two chemotypes were identified on the basis of the camphor and 1, 8-cineole. The camphor chemotype ofL. ukambensiscontained camphor (37.3%) with only traces of 1, 8-cineole, while the other chemotype contained 1, 8-cineole (23.7%) and only 1.1% camphor. Of the twelve components which were present in both chemotypes, only eight were quantitatively significantly different. The major compound in the oil ofL. somalensiswas 1, 8-cineole (31.9%). By using fifteen components ofL. somalensisoil, its similarities and differences with those of the twoLippiachemotypes were compared.

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697976

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Field studies have been conduced over a five-year period to examine the effect of nitrogen application on the yield and quality of essential oil in Java citronella(Cymbopogon winterianusJowitt) in a semi-arid tropical region in South India. The results showed that the yield per unit area of citronella fresh plant (herbage) differed significantly between years; the yields increased up to the second year after which time they started to decline. During the first two years, nitrogen applications up to 300 kg N/ha/year increased the oil yield significantly; however, during the third and fourth years the response to N was quadratic. This shows that it is possible to reduce the application of N after two years, while still maintaining the same content and quality of essential oil. The oil content and chemical composition of oil did not change as the age of the crop increased.

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697977

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Pentane extracts of the seeds (fruits) of 44 cultivars of parsley have been examined by gas chromatography. The curly-leaved parsley cultivars can be distinguished by their dark brown light mericarps which possess an essential oil rich in monoterpenes, particularly α-pinene (15.7–24.1%) and β-pinene (9.6–15.1%). In root parsley, only α-pinene (10.6%), β-pinene (7.1%), myristicin (2.5%) and apiole (79.8%) were found, while apiole (30.4–67.5%) is the principal constituent of Giant Italian parsley. Myristicin (0.7–62.3%) was present in all parsley specimens analyzed.

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697978

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

In Bulgaria, peppermint(Mentha piperitaL.) must be grown under irrigation if high yields of oil and leaves are to be realized. To determine the most efficient and beneficial irrigation system, the effect of sprinkler irrigation, surface drip irrigation, subsurface irrigation at 35 cm depth and subsurface irrigation with microporous hose at 15 cm depth on peppermint culture over a four-year period was evaluated. It was found diat the highest yield of oil and plant material was obtained when drip surface irrigation or subsurface irrigation using microporous hose was used. Both of these irrigation practices were found to conserve water to a greater extent than the other practices examined.

ISSN:1041-2905    

DOI:10.1080/10412905.1991.9697979

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor