摘要:

The chemical composition of the cold-pressed oils obtained from three mandarin cultivars (“Comun,” “Malvasio” and “Ellendale”) and two mandarin hybrids (“Ortanique” and “Malaquina”) grown in Uruguay were examined using a combination of alumina column chromatography and capillary GC. Forty-five constituents were characterized in the oils with the limonene content varying from 75.26–96.23%. The composition and olfactory characteristics of these oils were compared with those of Italian mandarin oil and Uruguayan sweet orange oil. It was found that the “Ortanique” and “Ellendale” oils were very different from normal mandarin oil, with great similarity in composition and olfactory characteristics to sweet orange oil. The oil of “Malaquina” is also similar more to sweet orange oil than mandarin oil although it is quite rich in aliphatic aldehydes, particularly decanal. The oil of the cv. Malvasio has a composition which is between mandarin and sweet orange oils. The oil of cv. Comun is the only one found to possess olfactory and chemical characteristics similar to Italian mandarin oil.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698060

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The oil obtained by distillation of the liquid of the screw-pressed residues of the cold-extraction of mandarin oil, and the cold-pressed mandarin oil have been examined using capillary GC. Thirty-six components were characterized in both oils. The results of 266 analyses of cold-pressed mandarin oil, 29 analyses of distilled mandarin oil and 26 analyses of mixtures of 5–20% of distilled oil mixed with cold-pressed oil are presented. Component ratios of terpinen-4-ol with cis-sabinene hydrate, trans-sabinene hydrate, citronellal and decanal have been used to detect the additions of the less valued distilled oil in the cold-pressed oil. In most cases the component ratios found in mixtures of 10% distilled oil in cold-pressed oil can be used to infer that such a mixture has taken place. Nevertheless, because of wide component value ranges found in both the cold-pressed and distilled oils it remains difficult to determine the lower limits of adulteration detection.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698061

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The essential oil fromStrobilanthes callosus(Acanthaceae) from Central India was analyzed by a combination of GC, GC/MS and NMR. An oil obtained from pre-flowering plants was found to possess compositional differences to an oil from post-flowering plants. The oil from post-flowering plants contained trans-sabinene hydrate (3%), cis-sabinenehydrate (9%), terpinen-4-ol (19%), α-terpineol (5%) and methylchavicol (24%). The oil from pre-flowering plants contained trans-sabinene hydrate (5%), cis-sabinene hydrate (14%), terpinen-4-ol (23%), α-terpineol (5%), and methyl chavicol was not detected.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698062

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A petroleum ether extract of the peelings of the fresh fruits ofDiospyros discolorWilld. on treatment with ethanol gave an extract in which the following major components were identified: benzyl benzoate(19.2%), benzyl salicylate (26.9%), cinnamyl benzoate (10.3%), benzyl butyrate (4.1%) and butyl benzoate (6.0%). The absence of alkyl butyrates, which were previously reported in the essential oil from this species, may be as the result of their hydrolysis to give free butyric acid. The free acid could be responsible for the change in odor to a harsher butyric note after the fruit has been harvested.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698063

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Sage plants (Salvia officinalisL.), seed-grown from wild populations, collected along the Adriatic coast, were cultivated. The morphological features, essential oil content and composition of these plants were found to be similar to plants growing in the wild. Therefore, it appears that the herbal characters are under genetic control. This means that genetic variability could be used for selection and breeding purposes.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698064

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Essential oils and headspace of 14 different clones ofAgastache foeniculumwere obtained by hydrodistillation and by purging the plant material with nitrogen gas, respectively. The constituents of both the oils and headspace were analyzed by capillary GC and GC/MS. Over 50 compounds were detected in oils isolated by the two extraction procedures. Only ten constituents, however, accounted for more than 0.1% and methyl chavicol constituted 95–98% of the essential oil. Yield and quality of oil were only marginally affected by year of production and time of harvest of the plant material.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698065

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Twelve compounds were identified by GC/MS and relative retention times in an oil ofMicromeria brownei(Swartz) Benth. var.pilosiusculaGray. The major compounds are pulegone (51.69%), menthone (20.88%) and neomenthol (11.87%).

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698066

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The water distilled essential oil from the flowering herb ofThymus sibthorpiiBentham was studied by GC/MS. Some physico-chemical characteristics were also determined. Fifty compounds representing 95.08% of the oil were characterized. Thymol (34.8%) was the only major component.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698067

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The steam-distilled oil from the bark ofArtabotrys lastourvillensisfrom Gabon was examined by GC/MS. All seventeen components identified were sesquiterpenoids of which cyperene (25.9%) and cyperenone (11.1%) were the most abundant components in the oil.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698068

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The essential oil ofChromolaena odorata(L.) R. M. King and H. Robinson from Vietnam, obtained by steam distillation of the leaves, has been analyzed by a combination of GC and GC/MS. More than 40 components were found, with geijerene (42.5%) and β-cubebene (12.5%) as major constituents.

ISSN:1041-2905    

DOI:10.1080/10412905.1992.9698069

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor