摘要:

As a part of our research on essential oil composition of plants from San Luis, Argentina, we have examined the effect of harvesting period on the essential oil composition. The period ranging from February (summer) to April (autumn), gave the best yield in autumn. The oil fromLippia aff. juneliana(Mold.) Tronc. produced in the autumn was found to contain higher amounts of oxygenated compounds than the oil produced in summer. The oils have piperitenone oxide (22.9% and 47.7%), limonene (26.8% and 19.9%) and trans-dihydrocarvone (0% and 16.0%) as major components, respectively.

ISSN:1041-2905    

DOI:10.1080/10412905.1999.9701083

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The essential oil ofEchinophora sibthorpianaGuss.(Umbelliferae) collected from Iran, was analyzed by means of GC, GC/MS,13C-NMR, and in the case of major constituents,1H-NMR spectroscopy techniques were used for identity confirmation. The main constituents identified in this oil were methyl eugenol (50.4%), α-phellandrene (16.3%), δ-3-carene (17.4%), p-cymene (8.3%) and β-phellandrene (3.7%).

ISSN:1041-2905    

DOI:10.1080/10412905.1999.9701084

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The yields of essential oils obtained from dried leaves ofEucalyptus citriodoraandE. camaldulensisranged according to the location between 2.3% and 5.9% forE. citriodoraand between 0.6% and 1.4% forE. camaldulensis.Twenty-eight components were identified by GC/MS. InE. citriodoraandE. camaldulensis, 90% of the isolated oils were obtained after one hour distillation and they contained maximal amounts of citronellal (75%) forE. citriodoraoil and 1,8-cineole (47–71%) forE. camaldulensisoil. At longer isolation times further quantities of oils collected became negligible and the proportions of the main constituents fell significantly. The chemical composition of the oils ofE. citriodoraandE. camaldulensisobtained from plants located in the economically most relevant areas of Benin depended on location and harvesting time. The effects of these two parameters are different for the two oils. An oil ofE. citriodorarich in citronellal (>75%) could be obtained throughout the year with a yield of 5% at Calavi, while even at the best time (June to August) the yield of oil was only 2.5% at Kétou. ForE. camaldulensis, the best yield was approximatively 1.3% at Calavi (February-March) and Kétou (April-May). The Sémé-Ekpé location afforded an oil with a high level of 1,8-cineole (70%) with highest yield in February-March. The Calavi location was exploitable only during that period.

ISSN:1041-2905    

DOI:10.1080/10412905.1999.9701085

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Effects of thyme oils extracted from nineThymus vulgarischemotypes, cinnamon oil(Cinnamomum zeylanicum), cinnamaldehyde and carvacrol were studied on growth ofMalassezia furfurandCandida albicans.The last three substances and the carvacrol chemotype of thyme oil were the most efficient against the two yeasts. Yeast growth was monitored throughout eight days under log-step concentrations (1 μg/mL-1000 μg/mL) of these four substances. MICs (minimum inhibitory concentrations) and MLCs (minimum lethal concentrations) were also determined by two different methods: poisoned food and dilution-neutralization methods. MICs and MLCs values obtained by the former are lower than those determined by the latter.M.fitrfurwas observed to be more sensitive to cinnamon oil and cinnamaldehyde, whileC. albicanswas more sensitive to thyme oil and carvacrol. It was also found that essential oil activity is mainly due to their respective major components.

ISSN:1041-2905    

DOI:10.1080/10412905.1999.9701086

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:1041-2905    

DOI:10.1080/10412905.1999.9701087

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:1041-2905    

DOI:10.1080/10412905.1999.9701088

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:1041-2905    

DOI:10.1080/10412905.1999.9701052

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor