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corymbia_citriodora_hook._k.d.hill_l.a.s.johnson

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corymbia_citriodora_hook._k.d.hill_l.a.s.johnson [2017/04/26 09:26]
andreas
corymbia_citriodora_hook._k.d.hill_l.a.s.johnson [2017/11/19 15:29] (aktuell)
andreas
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 "​...tall tree, growing to 35 metres in height (but sometimes taller), from temperate and tropical north eastern Australia...The essential oil of the lemon-scented gum mainly consists of citronellal (80%), produced largely in Brazil and China. While unrefined oil from the lemon eucalyptus tree is used in perfumery, a refined form of this oil is used in insect repellents. The refined oil's citronellal content is turned into cis- and trans- isomers of p-menthane-3,​8-diols (PMD), a process which occurs naturally as the eucalyptus leaves age. This refined oil, which includes related compounds from the essential corymbia citriodora, is known widely by its registered tradename, "​Citriodiol",​ but also by generic names which vary by country or continent: "oil of lemon eucalyptus"​ or "​OLE"​(USA);​ "PMD rich botanic oil" or "​PMDRBO"​(Europe);​ "PMD and related oil of lemon eucalyptus compounds"​ (Canada); Extract of Lemon Eucalyptus (Australia). Pure PMD is synthesized for commercial production from synthetic citronellal."​ [[http://​en.wikipedia.org/​wiki/​Corymbia_citriodora]] "​...tall tree, growing to 35 metres in height (but sometimes taller), from temperate and tropical north eastern Australia...The essential oil of the lemon-scented gum mainly consists of citronellal (80%), produced largely in Brazil and China. While unrefined oil from the lemon eucalyptus tree is used in perfumery, a refined form of this oil is used in insect repellents. The refined oil's citronellal content is turned into cis- and trans- isomers of p-menthane-3,​8-diols (PMD), a process which occurs naturally as the eucalyptus leaves age. This refined oil, which includes related compounds from the essential corymbia citriodora, is known widely by its registered tradename, "​Citriodiol",​ but also by generic names which vary by country or continent: "oil of lemon eucalyptus"​ or "​OLE"​(USA);​ "PMD rich botanic oil" or "​PMDRBO"​(Europe);​ "PMD and related oil of lemon eucalyptus compounds"​ (Canada); Extract of Lemon Eucalyptus (Australia). Pure PMD is synthesized for commercial production from synthetic citronellal."​ [[http://​en.wikipedia.org/​wiki/​Corymbia_citriodora]]
 +
 +"The chemical composition of decanted (obtained directly by steam distillation of the leaves) and recovered (extracted from distillation water using hexane) essential oils of Eucalyptus citriodora were examined. The decanted oil was richer in citronellal (70.3%), citronellol (8.8%), citronellyl acetate (1.3%) and β-caryophyllene (2.6%). The recovered oil was richer in isopulegol (53.0%), borneol (10.0%), menthol (5.3%), neral (6.9%), geraniol (1.4%) and eugenol (4.6%). Citronellal,​ the major constituent of the decanted oil, was absent in the recovered oil." \\
 +[Rajeswara Rao, B. R., et al. "​Comparative composition of decanted and recovered essential oils of Eucalyptus citriodora Hook." Flavour and fragrance journal 18.2 (2003): 133-135]
  
 | {{:​citronellal.jpg|citronellal}} \\ [[https://​en.wikipedia.org/​wiki/​Citronellal|citronellal]] | {{:​p_menthan38diol.jpg|p-menthane-3,​8-diols}} \\ p-menthane-3,​8-diols | | {{:​citronellal.jpg|citronellal}} \\ [[https://​en.wikipedia.org/​wiki/​Citronellal|citronellal]] | {{:​p_menthan38diol.jpg|p-menthane-3,​8-diols}} \\ p-menthane-3,​8-diols |
corymbia_citriodora_hook._k.d.hill_l.a.s.johnson.txt · Zuletzt geändert: 2017/11/19 15:29 von andreas