ISSN:0882-5734    

DOI:10.1002/ffj.2730050202

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

ISSN:0882-5734    

DOI:10.1002/ffj.2730050203

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractThe aim of the study was to investigate the possibilities of enriching the most volatile chamomile (Chamomilla recutita(L.) Rauschert) compounds in extracts by supercritical carbon dioxide extraction and to analyse them by headspace gas chromatography (HSGC). HSGC was combined with mass spectrometry for identification of the compounds. The present study shows that extraction using supercritical carbon dioxide is a convenient method for isolating volatile oils. Also the most volatile components of essential oils, that are normally lost during isolation, can be enriched in an extract obtained by supercritical carbon dioxide extraction.

ISSN:0882-5734    

DOI:10.1002/ffj.2730050204

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractThe essential oil of the flower concrete ofChimonanthus praecoxLink. (Calycanthaceae) from China has been investigated by a combination of chromatographic and spectroscopic methods. This essential oil possesses a characteristic sweet floral odour. As the result of analysis, a total of 161 compounds were identified. The main constituents weretrans‐β‐ocimene, nonanal, linalol, bornyl acetate, 3,7‐dimethylocta‐1,5(E), 7‐trien‐3‐ol, δ‐cadinene, benzyl alcohol and elemol, accounting for 32.53% of the neut

ISSN:0882-5734    

DOI:10.1002/ffj.2730050205

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractThe essential oil of the leaves ofCurcuma longaL. (Zingiberaceae) was investigated by GC, NMR and MS. Major constituents are α‐phellandrene (47.7%) and terpinolene (28.9%). The oil is composed mainly of monoterpen

ISSN:0882-5734    

DOI:10.1002/ffj.2730050206

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractThe chemical composition of essential oils from 22Eucalyptusspecies growing in Uruguay are described. It was found that 1, 8‐cineole, citronellal,p‐cymene and benzaldehyde are the main constitue

ISSN:0882-5734    

DOI:10.1002/ffj.2730050207

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractCultivars of hop,Humulus lupulusL., are of economic importance for breweries, since hop cones contain a resinous fraction, responsible for the bitter taste of beer, and a volatile fraction, which contributes to its flavour. Till now research on the presence of volatile compounds in the leaves of hop plants has not been reported.Dried leaves of ten cultivars were submitted to hydrodistillation, using the apparatus described in theEuropean Pharmacopoeia. A trap of pentane was necessary to detect and to take up the oils, because hop leaves contain volatile compounds to a much lesser extent than hop cones (<0.05%).The oils were analysed by GC and GC–MS. Of the many components detected 36 were identified, among which were eleven alkanes. In all oil samples sesquiterpene hydrocarbons clearly predominated; α‐humulene (3‐23%) and β‐caryophyllene (5‐29%) were the main components. β‐Myrcene, one of the main components of the essential oils from the cones of the same cultivars, was found in the leaf oils in a concentration

ISSN:0882-5734    

DOI:10.1002/ffj.2730050208

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractThe essential oil isolated from aerial parts ofHyptis spicigeraLam., used for example in baths in northern Nigeria, was analysed by capillary GC. Forty‐three components of the oil were identified, among which many occurred in small quantities. The identity of the components was confirmed by GC–MS using an ion trap detector. The oil was characterized by a high content of β‐caryophyllene (68%) and the presence of C16and C18fatty acid methyl esters. The present paper describes the analysis of the essential oil ofH. spicigera, family Lamiaceae, grown in Nigeria. Neither phytochemical nor pharmacological studies on the plant have been reported prev

ISSN:0882-5734    

DOI:10.1002/ffj.2730050209

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractThe essential oil composition ofLippia alba(Mill.) N. E. Brown, andAloysia chamaedrifoliaCham. (Verbenaceae) growing in Uruguay are described. The main components are camphor, 1,8‐cineole and β‐cubebene forL. albaand globulol, spathulenol and γ‐elemene forA. chamaed

ISSN:0882-5734    

DOI:10.1002/ffj.2730050210

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractPatchouli,Pogostemon cablinBenth., is an important source of essential oil. On the basis of botanical observations and gas‐chromatographic patterns of oils obtained, the major characteristics of three cultivars were compared. From cultivar I, an oil close to that commercially available was produced with a yield of 1.6% (wt/wt). From cultivar II, a lower yield of an oil having an additional component was obtained. From cultivar III, a relatively high amount of oil was recovered from each plant owing to the bigger canopy it forms. The quality of the oil, however, was judged to be markedly different from that of others. Each cultivar could be identified by its characteristic leaf morphology and trichome densit

ISSN:0882-5734    

DOI:10.1002/ffj.2730050211

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY