Components of Essential Oils Extracted from Leaves and Shoots of Abies Species in Japan

The essential oils extracted from the leaves and the shoots of five Abies species (Pinaceae) growing in Japan, i.e., A. firma, A. homolepis, A. veitchii, A. mariesii , and A. sachalinensis , were characterized by GC‐FID and GC/MS analyses. The yields of the essential oils extracted from A. sachalinensis were the highest among them. A significant amount of α ‐pinene was contained in the essential oils of all the Abies species examined. In A. homolepis and A. veitchii , significant differences in the content of the essential oils were found depending on whether these were extracted from the leaves or from the shoots. Regarding the enantiomeric ratio of α ‐pinene, the (+)‐enantiomer was predominant in the oil extracted from the leaves of A. firma , while (−)‐ α ‐pinene was present in higher amounts in the oils of A. veitchii (leaves and shoots), A. mariesii (leaves and shoots), and A. sachalinensis (shoots). The fact that there may be a quantitative and qualitative difference in the components of the essential oils extracted from the different parts of a plant was investigated by cluster analysis.