Abstract
This study was conducted to evaluate the diurnal effect on essential oil yield and composition of Ledum palustre L. grown in northern Inner Mongolia, China. Essential oil content and composition were determined and compared as a function of different harvesting times viz. 7:00 AM, 11:00 AM, 3:00 PM, 7:00 PM, and 11:00 PM within a day. The essential oil obtained by hydrodistillation was investigated by gas chromatography-mass spectrometry (GC-MS). The yield of essential oil was varied from 1.21% to 1.62%; the maximum oil yield was obtained at 3:00 PM and the minimum at 7:00 PM. Similar to oil yield, qualitative difference in essential oil composition of L. palustre was observed. For the best essential oil yields, L. palustre should be harvested during 11:00 AM to 3:00 PM.
Highlights
Leum palustre L., known as wild rosemary or marsh tea, is an evergreen low shrub growing wild in northern China and America, northern and central Europe
The objective of this study was to evaluate the effect of diurnal variation on yield and composition, of the essential oil from the aerial parts of L. palustre L. grown wild in northeastern China
The oil and the main components yields were significantly affected by diurnal variation (Table 1). It can be seen from the table, essential oil yield varied from 1.21 to 1.62 g of oil per 100 g of dry herbage
Summary
Leum palustre L., known as wild rosemary or marsh tea, is an evergreen low shrub growing wild in northern China and America, northern and central Europe. Essential oils were obtained from different parts of L. palustre (all overground parts, shoots and leaves) plants. The content of oils in young leaves and shoot was higher than in the corresponding aged parts [4]. The composition of the essential oil varied in a wide range in different localities. The well-known repellent properties of the essential oil of wild L. palustre against bedbugs, clothing moths and other insects are valued [7] [8]. Diurnal changes in Chinese wild L. palustre L. essential oil yield and composition are not known. The objective of this study was to evaluate the effect of diurnal variation on yield and composition, of the essential oil from the aerial parts of L. palustre L. grown wild in northeastern China
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