Abstract: Cryptomeria japonica (sugi) is one of common coniferous trees in Taiwan forest.
Extraction of natural compounds from essential oils and extracts of sugi tree would be
helpful to expand the utilization of forest products and increase the economic values.
Therefore, the purpose of this plan is to isolate the antibacterial extractives from the
essential oils from sugi tree. Major constituents of essential oils from sugi tree are
identified by GC-MS analysis. Antibacterial activities of oils and compounds are
examined by the antibacterial assay. Through this research, it is expected to expand the
utilization of essential oils from sugi tree and increase the economic values of sugi