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corymbia_citriodora_hook._k.d.hill_l.a.s.johnson [2016/07/29 13:21] andreas |
corymbia_citriodora_hook._k.d.hill_l.a.s.johnson [2017/04/26 09:26] andreas |
"In all, 19 constituents were identified in oil from juvenile and senescent leaves compared to 23 in adult leaves and 20 in leaf litter, respectively. Citronellal, a characteristic monoterpene of the oil reported hitherto was found to be more (77-78%) in the juvenile and senescent leaves compared to 48 and 54%, respectively, in the adult leaves and leaf litter. In the adult leaves, however, the content of citronellol - another important monoterpene - was very high (21.9%) compared to other leaf types (7.8-12.2%)." \\ | "In all, 19 constituents were identified in oil from juvenile and senescent leaves compared to 23 in adult leaves and 20 in leaf litter, respectively. Citronellal, a characteristic monoterpene of the oil reported hitherto was found to be more (77-78%) in the juvenile and senescent leaves compared to 48 and 54%, respectively, in the adult leaves and leaf litter. In the adult leaves, however, the content of citronellol - another important monoterpene - was very high (21.9%) compared to other leaf types (7.8-12.2%)." \\ |
[Chemical composition and phytotoxicity of volatile essential oil from intact and fallen leaves of Eucalyptus citriodora., Batish DR, Singh HP, Setia N, Kaur S, Kohli RK., Z Naturforsch C. 2006 Vol.61(7-8), 465-71] [[http://znaturforsch.com/ac/v61c/s61c0465.pdf]] | [Chemical composition and phytotoxicity of volatile essential oil from intact and fallen leaves of Eucalyptus citriodora., Batish DR, Singh HP, Setia N, Kaur S, Kohli RK., Z Naturforsch C. 2006 Vol.61(7-8), 465-71] [[http://znaturforsch.com/ac/v61c/s61c0465.pdf]] |
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| "A simple and efficient method was developed for the synthesis of para-Menthane-3,8-diol (PMD), a well-known repellent active against mosquitoes, from Eucalyptus citriodora essential oil by a treatment of citric acid in a biphasic medium (H2O/essential oil). The E. citriodora contains as main component (+)-citronellal (74% in the present case), which cyclises (Prins reaction) to form cis/trans PMD isomers. As an example, an emulsion containing an aqueous solution of 7% citric acid and E. citriodora oil at 50°, conducted after 15h stirring to 82% conversion of (+)-citronellal with a selectivity of 80% with the remaining presence of monoterpenes and sesquiterpenes in the medium. Investigations of lasting protection on human volunteers are carried out using a cage test bioassay protocol and Aedes aegypti mosquitoes. At 20% in iPrOH, the new reaction mixture showed a complete protection of 303 min compared to 22 min with the pure essential oil. The modified oil was compared with N,N-diethyl-m-methylbenzamide (DEET), the most popular active used in repellent formulations. Thermogravimetric analyses (TGA) of E. citriodora, the modified oil, PMD, DEET, and (+)-citronellal were performed and showed a slow evaporation rate for PMD and DEET as well as for the modified oil, which may explain their long lasting protection action." \\ |
| [Drapeau, Jeremy, et al. "Green synthesis of para-Menthane-3, 8-diol from Eucalyptus citriodora: Application for repellent products." Comptes Rendus Chimie 14.7 (2011): 629-635] |
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{{http://www.hear.org/molokai/kalaupapa/herbarium/images/originals/corymbia_citriodora_kala_13369.jpg?700}} \\ | {{http://www.hear.org/molokai/kalaupapa/herbarium/images/originals/corymbia_citriodora_kala_13369.jpg?700}} \\ |
Corymbia citriodora, Kalaupapa HNP herbarium, from www.hear.org [[http://www.hear.org/molokai/kalaupapa/herbarium/vouchers/corymbia_citriodora_kala_13369.htm]] | Corymbia citriodora, Kalaupapa HNP herbarium, from www.hear.org [[http://www.hear.org/molokai/kalaupapa/herbarium/vouchers/corymbia_citriodora_kala_13369.htm]] |