Leaf oils of Juniperus macropoda collected from different localities (Hindolkhal and Mussorie) of Garhwal Himalaya (Uttaranchal) exhibited much variation in their yield and composition. Oil yields in the Hindolkhal and Mussorie samples were 1.2% and 0.52% respectively. In the Hindolkhal sample, β β β β β-elemene (42.5%) was the main constituent of oil, followed by t-sabinene hydrate (8.8%) and α α α α α-cubebene (7.9%), while in the Mussorie sample the main oil constituent was α α α α α-thujone (22.6%), followed by biformene (7.7%) and sabinene (5.8%).
The yield and composition of the essential oil obtained by hydrodistillation of inflorescences from different populations of Artemisia annua L. (Asteraceae), transplanted during different months, was analysed using a combination of GC and GC-MS. Oil yield was found to range from 0.5 to as high as 1.6% (w/v), in which 24 constituents were identified, representing 84.4-92.2% of the total oil. Camphor was identified as the most abundant component in all the samples examined, followed by 1,8-cineole, except in June-transplanted plants, where β-caryophyllene was found to be the second most abundant compound. Camphor and 1,8-cineole alone constituted 44.7-65% of the total oil. The percentage occurrence of rest of the compounds was found to vary in different populations.
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