title: Chemical polymorphism and antifungal activity of essential oils from leaves of different provenances of indigenous cinnamon (Cinnamomum osmophloeum).
abstract: The essential oils isolated from nine geographical provenances of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) leaves were examined by GC-MS and their chemical constituents were compared. According to GC-MS and cluster analyses the leaf essential oils of the nine provenances and their relative contents were classified into six chemotypes-cinnamaldehyde type, cinnamaldehyde/cinnamyl acetate type, cinnamyl acetate type, linalool type, camphor type and mixed type. In addition, the antifungal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon were investigated in this study. Results from the antifungal tests demonstrated that the leaf essential oils of cinnamaldehyde type and cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against white-rot fungi, Trametes versicolor and Lenzites betulina and brown-rot fungus Laetiporus sulphureus. The antifungal indices of leaf essential oils from these two chemotypes at the level of 200 micro/ml against T. versicolor, L. betulina and L. sulphureus were all 100%. Among them, the IC(50) (50% of inhibitory concentrations) value of the essential oil of cinnamaldehyde type leaf against L. sulphureus was 52-59microg/ml. Cinnamaldehyde possessed the strongest antifungal activities in comparison with other constituents of the essential oils from cinnamaldehyde type leaf, at the level of 100microg/ml its antifungal indices against T. versicolor, L. betulina and L. sulphureus were 100%. The IC50 values of cinnamaldehyde against T. versicolor, L. betulina and L. sulphureus were 73, 74 and 73microg/ml, respectively.
authors.affiliation: School of Forestry and Resource Conservation, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 106, Taiwan.
authors.forename: Sen-Sung
authors.initials: SS
authors.lastname: Cheng
authors.forename: Ju-Yun
authors.initials: JY
authors.lastname: Liu
authors.forename: Yen-Ray
authors.initials: YR
authors.lastname: Hsui
authors.forename: Shang-Tzen
authors.initials: ST
authors.lastname: Chang
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry* / Q000494:pharmacology*; D027424:Cinnamomum / Q000737:chemistry*; D005658:Fungi / Q000187:drug effects; D020128:Inhibitory Concentration 50; D009822:Oils, Volatile / Q000737:chemistry / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D000935:Antifungal Agents; D009822:Oils, Volatile; D010938:Plant Oils