Benutzer-Werkzeuge

Webseiten-Werkzeuge


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

Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

Link zu dieser Vergleichsansicht

Beide Seiten der vorigen Revision Vorhergehende Überarbeitung
Letzte Überarbeitung Beide Seiten der Revision
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
Zeile 9: Zeile 9:
 "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]]
 +
 +"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]
  
 {{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]]
corymbia_citriodora_hook._k.d.hill_l.a.s.johnson.txt · Zuletzt geändert: 2017/11/19 15:29 von andreas