本研究之目的在探討有機溶劑，精油萃取法、土肉桂葉片前處理及乾燥溫度對土 肉桂精油收率、成分及其含量的影響。 分析土肉桂葉中之精油成分中以桂皮醛（Cinnamic aldehyde）含量最高，最高者可達 81%，此外尚有Benzaldehyde、Iso-bornyl acetate、Cinnamyl acetate、α-pinene、3- phenylpropanal、p-cymene等20種成分被鑑定出來。萃取所用有機溶劑對土肉桂精油收率及 精油中桂皮醛的含量影響，正戊烷、乙醚及正戊烷/乙醚（1:1）三種有機溶劑中，以後兩者 之萃取效果較佳。兩種萃取精油的方法中，以蒸氣蒸餾後接溶劑萃取法所得精油收率較 Likens-Nickerson蒸氣蒸餾與溶劑萃取法為高。至於葉片粉碎方法與精油收率之高低，則以 用果汁機加水打碎>用攪碎機打碎>直接萃取。精油收率及精油中一些成分及其含量會受到葉 片乾燥溫度的影響。
The purpose of the research is to evaluate the effects of organic solvents, methods of essential oil distillation and extraction, pretreatments and drying temperatures of the leaves on the yields and composition of the essential oil of Cinnamomum osmophloeum Kanehira. Cinnamic aldehyde is the major component of the essential oil of the leaves. Other components are benzaldehyde, iso-bornyl acetate, cinnamyl acetate, α- pinene, 3-phenylpropanal and p-cymene, etc. A total of more than 20 different components have been identified. The organic solvents used for extraction had different effects on the yields and cinnamic aldehyde contents of the essential oil. Among pentane, ether and pentane/ether (1:1), the latter two had better results. Steam distillation followed by solvent extraction had higher yields of thethe essential oil than using Likens-Nickerson steam distillation and solvent extraction method. The comparison of the difference on the yield of essential oil among the pretreated leaves is: leaves mashed by mixer> leaves broken by blender> leaves used directly. The yields and some contents of the essential oil vary when different drying temperatures and times were used.
