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cupressus_nootkatensis_d._don

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cupressus_nootkatensis_d._don [2018/12/31 10:55]
andreas
cupressus_nootkatensis_d._don [2018/12/31 12:20] (aktuell)
andreas
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 "The essential oil of Alaska cedar heartwood is known to contain compounds which contribute to the remarkable durability of this species. While previous research has identified several compounds, a complete description of this oil, which has a "​burnt-grape fruit" odor, has not been undertaken. In this research a profile of the oil is given in which the major components are identified by GC-MS, isolation and spectroscopic techniques. The major components of the steam distilled essential oil were identified as nootkatin, nootkatone, valencene, nootaktene, carvacrol, methyl carvacrol, nootkatol, and eremophil-1(10),​11-dien-13-ol. In addition, it was found that the diethyl ether extract of the heartwood contained 1(10)-eremophilen-11,​12-epoxide as a major component in addition to the compounds found in the steam distilled essential oil. 1(10)-Eremophilen-11,​12-epoxide apparently does not survive the condition of steam distillation. Nootkatol, eremophil-1(10),​11-dien-13-ol and 1(10)-eremophilen-11,​12-epoxide have not been previously reported in Alaska cedar. Nootkatol is a known compound having been reported in other plants. However, eremophil-1(10),​11-dien-13-ol and 1(10)-eremophilen-11,​12-epoxide represent new chemical structures to science being described here for the first time." \\ "The essential oil of Alaska cedar heartwood is known to contain compounds which contribute to the remarkable durability of this species. While previous research has identified several compounds, a complete description of this oil, which has a "​burnt-grape fruit" odor, has not been undertaken. In this research a profile of the oil is given in which the major components are identified by GC-MS, isolation and spectroscopic techniques. The major components of the steam distilled essential oil were identified as nootkatin, nootkatone, valencene, nootaktene, carvacrol, methyl carvacrol, nootkatol, and eremophil-1(10),​11-dien-13-ol. In addition, it was found that the diethyl ether extract of the heartwood contained 1(10)-eremophilen-11,​12-epoxide as a major component in addition to the compounds found in the steam distilled essential oil. 1(10)-Eremophilen-11,​12-epoxide apparently does not survive the condition of steam distillation. Nootkatol, eremophil-1(10),​11-dien-13-ol and 1(10)-eremophilen-11,​12-epoxide have not been previously reported in Alaska cedar. Nootkatol is a known compound having been reported in other plants. However, eremophil-1(10),​11-dien-13-ol and 1(10)-eremophilen-11,​12-epoxide represent new chemical structures to science being described here for the first time." \\
 [Xiong, Yeping. "​Essential oil components of Alaska cedar heartwood."​ (2000)] [Xiong, Yeping. "​Essential oil components of Alaska cedar heartwood."​ (2000)]
 +
 +Of 15 natural products isolated from essential oil components extracted from the heartwood of Chamaecyparis nootkatensis,​ "​...nootkatone from Alaska yellow cedar was the most effective of the eremophilane sesquiterpenes against ticks (LC50 = 0.0029%), whereas the nootkatone grapefruit extract exhibited the greatest biocidal activity against fleas (LC50 = 0.0029%). Mosquitoes were most susceptible to one of the derivatives of valencene, valencene-13-aldehyde (LC50 = 0.0024%), after 24 h. " \\
 +[Panella, Nicholas A., et al. "Use of novel compounds for pest control: insecticidal and acaricidal activity of essential oil components from heartwood of Alaska yellow cedar."​ Journal of medical entomology 42.3 (2005): 352-358]
  
 Essential oil components extracted from the heartwood of Chamaecyparis nootkatensis were evaluated against nymphal Ixodes scapularis in a laboratory bioassay and compared with N,​N-diethyl-3-methylbenzamide (DEET). Nootkatone, valencene-13-ol,​ nootkatone 1→10 epoxide, and carvacrol had repellent concentration (RC)50 values in the range of DEET. \\ Essential oil components extracted from the heartwood of Chamaecyparis nootkatensis were evaluated against nymphal Ixodes scapularis in a laboratory bioassay and compared with N,​N-diethyl-3-methylbenzamide (DEET). Nootkatone, valencene-13-ol,​ nootkatone 1→10 epoxide, and carvacrol had repellent concentration (RC)50 values in the range of DEET. \\
cupressus_nootkatensis_d._don.txt · Zuletzt geändert: 2018/12/31 12:20 von andreas