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Authors: | M.G. Miguel, F. Duarte, F. Venāncio, R. Tavares, C. Guerrero, H. Martins, J. Carrasco |
Keywords: | Lamiaceae, harvesting period, essential oil, 1,8-cineole, camphor, -pinene, β-pinene, camphene |
DOI: | 10.17660/ActaHortic.2002.576.14 |
Abstract:
In the present work, the chemical composition of the essential oils obtained from Thymus mastichina (L.) L. subsp. mastichina was evaluated over a two year period.
The oils were analysed by GC and GC/MS following 3 hours distillation of plant material, using Likens-Nickerson-type apparatus.
The major component in the essential oils was 1,8-cineole, an oxygenated monoterpene, whose concentrations ranged from 42.2 % to 50.4 %. Camphor was another oxygenated monoterpene being present in relative high amount (7.4 %-11.5 %). -Pinene, camphene and -pinene were the most important monoterpene hydrocarbons in the essential oils.
The ratio of camphene changed on a large scale in the course of two vegetation cycles.
With minimum and maximum concentrations ranging from 3.1 % to 6.3 %. -Caryophyllene, -Cadinene and elemol were the most representative sesquiterpenes accumulating in a small amount, only (less than 2.5 %). The effect of the collection time, however, proved to be a factor of restricted importance.
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