摘要:

The composition of Italian sweet orange petitgrain oil was studied by LC-GC/MS (ITD), GC/MS (quadrupole) and GC systems with SE-52 and Carbowax 20 M GC columns. Industrial samples and laboratory samples from leaves of the cultivarsValencia late, Biondo comuneandMorowere analyzed. Sweet orange oils are characterized by a higher content of monoterpene hydrocarbons of which sabinene (38–49%) was the major component, and a lower content of oxygenated compounds than otherCitruspetitgrain oils. Industrial samples of sweet orange petitgrain oil are often contaminated by otherCitruspetitgrain oils. Because of the low value of sweet orange petitgrain oils little attention is paid to the selection of raw material to be distilled. Laboratory isolated oils show some differences in their composition, mostly for linalool and sesquiterpene hydrocarbons content. All orange petitgrain oils were characterized by the presence of α- and β-sinensal, which are absent in otherCitruspetitgrain oils.

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700737

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A natural variant of lemongrass(Cymbopogon flexuosus), with a citronella-like odor which was isolated from cycle-4 population of a recurrent selection program in lemongrass, was studied for its essential oil composition by GC and GC/MS. The main components of the oil were geraniol (13.1%), citronellyl acetate (11.2%) and geranyl acetate (25.9%), while neral (3.7%) and geranial (5.8%) were minor constituents.

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700738

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The essential oil obtained from air-dried aerial parts of plant speciesAnthemis carpaticaWilld. (Asteraceae), was analyzed by GC and GC/MS, and about 50 components were identified. The major constituents, α-thujone (40.2%), β-thujone (13–3%), yomogi alcohol (18.5%) and terpinen-4-ol (9.7%) were isolated by preparative GC. Their structure was confirmed by IR, CIMS and1H-NMR analysis.

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700739

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Crowea exalatahas been found to exist in five chemical forms. These were forms in which the principal components were: (a) safrole (81–88%),(b)(E)-methyl isoeugenol (18–25%) and (E)-carpacin (47–51%), (c) safrole (27–35%), (E)-methyl isoeugenol (29–46%) and α-pinene (12–25%), (d) safrole (6–29%) and asaricin (57–74%) and (e) l-allyl-2,6-dimethoxy-3,4-rnethylenedioxybenzene (30–43%), for which the common name exalatacin is proposed and croweacin (10–20%). All chemotypes yielded essential oils in 0.3–1.0% yield. The oil ofC. salignacontained croweacin (84–94%) as its principal component with smaller amounts of safrole and terpenes present. A hybridC. exalataxC. salignaalso contained croweacin (82%) as its principal component and possessed an oil very similar toC. saligna.A sample ofC. angustifoliavar.angustifoliaproduced an oil in which the major components were γ-asarone (68%), exalatacin (13%) and croweacin (7%).

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700740

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Essential oils ofOriganum ramonenseDanin leaves were obtained using two methods: steam-distillation followed by dichloromethane extraction (SDR), and simultaneous purging and extraction (SPE). Volatile constituents of the oils were isolated and identified by GC and GC/MS. A total of 132 compounds were identified using both methods. Among the more than 90 compounds identified in the oil obtained by SDR, 42 were alcohols which composed 79.5% of total GC peak area. The major volatile constituents of this oil were α-terpineol (41.53%), terpinen-4-ol (16.80%), cis-sabinene hydrate (13.17%), eugenol (3.6l%), and γ-terpinene (3.40%). Among 90 constituents identified in oil obtained by SPE, 28 were hydrocarbons which composed 55.70% of total GC peak area. The major constituents of oil obtained by SPE were 1,8-cineol (17.46%), γ-terpinene (14.69%), terpinen-4-ol (13.88%), α-terpinene (9.37%) and α-terpineol (6.83%).

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700741

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The analysis of industrial and laboratory-prepared bergamot oils produced in Uruguay during the 1995 production season was carried out by GC and GC/MS. The composition of the Uruguayan bergamot oils were compared with those of Italian bergamot oils. They were found to be very similar; however, they could be differentiated from their psoralen and coumarin contents. The enantiomeric ratio of linalool and linalyl acetate was also studied by GC using a β-cyclodextrin column. The results were similar to that found in Italian oils.

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700742

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The typical heliotropin-like odor that has been previously associated with vanillons(Vanilla pomponaSchiede, Guadeloupe vanilla) was thought to be due to piperonal (heliotiopin). This could not be confirmed by our HPLC analysis of vanillons, although the examined vanillons pods were found to possess a strong heliotropin-like odor, yet no piperonal was detected. Furthermore, it was ascertained that the vanillons containedp-hydroxybenzoic acid, vanillic acid,p-hydroxybenzaldehyde, p-anisyl alcohol, p-anisic acid andp-anisaldehyde in addition to vanillin, and that their composition evidently resembled more strongly Tahiti than Bourbon vanilla.

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700743

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Ontogenetic variation in the essential oil concentration and major components in the five genotypes ofCymbopogon jwarancusa(Khavi grass) was studied. Between 0.50% to 1.64% from stage 1 (green plants spikes initiated) to stage 9 (30–50% leaves brown), the oil content ranged from 0.50% to 1.64%. The main components of Khavi grass oil were piperitone, (44.9–66.8%), elemol (7.0–29.2%) and δ-2-carene (8.3-23–5%). The percentage composition of these constituents changes with the ontogenetic development. δ-2-Carene percentage declined sharply from pre-anthesis (19–8%) to anthesis (5–9%). The piperitone concentration (68.0%) at the time of seed formation, suggesting regulation of oil and oil constituents with the plant growth.

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700744

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Pd(PPh3)4catalyzed reaction of linalyl acetate with diethylamine gave N, N-diethylgeranylamine as a main product (E:Z = 90:10). The reaction of linalyl acetate with various amines gave their corresponding products. For example, the reaction of aniline with linalyl acetate gave N-geranylaniline in 100% stereoselectivity. The reaction of linalyl methylcarbonate with diethylamine using a Pd(0) catalyst similarly gave N, N-diethylgeranylamine (E:Z = 92:8).

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700745

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Vetiver(Vetiveria zizanioides(Stapf.) is grown in Burundi for its anti-erosive properties. A study to determine the effects of organic manure or a combination of organic manure and NPK fertilizer was performed. Criteria such as root yield, effect on harvest time, oil yield, oil quality and composition were examined. It was found that soil treatments increased the root yield from 1,500 kg/ha to ca 2,400 kg/ha, while harvest time effected oil quality and yield. Also the khusimol content ranged from 19-4-29.5%, and some oils were judged as having superior quality.

ISSN:1041-2905    

DOI:10.1080/10412905.1997.9700746

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor