Watering level effect on Thymus hyemalis Lange essential oil yield and composition

被引:39
作者
Jordán, MJ
Martínez, RM
Cases, MA
Sotomayor, JA
机构
[1] IMIDA, La Alberca 30150, Murcia, Spain
[2] Natl Inst Agr & Food Res & Technol, Madrid 28040, Spain
关键词
thyme; Thymus hyemalis; essential oil; water supply; yield; volatile components;
D O I
10.1021/jf034335m
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Thymus hyemalis Lange (chemotype thymol) was cultivated as an experimental crop under different watering level conditions in order to achieve 80, 60, 40, and 20% of the local potential evapotranspiration (Eto). Two harvesting periods were considered, winter and spring. As a consequence of the great variability among plants, essential oil yield percentages did not show statistically significant differences among seasons and different levels of water supply. Capillary GC-MS analysis of the essential oils permitted the detection of 84 volatile components. Among them, 54 are described for the first time as volatile constituents of the chromatographic profile of this Thymus species. Winter harvesting showed high concentrations in thymol percentage (25.92 +/- 4.39), the 40% Eto watering level being the best with respect to obtaining the optimum quality of this essential oil. However, in spring this thyme species needs a greater water supply (80% Eto) to achieve the same amount of thymol in the essential oil (29.20 +/- 2.83). From this, it was concluded that winter harvesting could be used for the extraction of the essential oil, with a low level of water supply, whereas spring harvesting could be employed for collection of leaves as a food condiment.
引用
收藏
页码:5420 / 5427
页数:8
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