Contents and Compositional Variations in the Essential Oils of Different Eucalyptus globulus trees from Faisalabad,Pakistan

摘要

The aim of present study was to find out the variations in contents and chemical composition of leaf oil among Eucalyptus globulus trees.The leaf oil from fifteen different Eucalyptus globulus trees extracted by hydro-distillation varied significantly in their contents and chemical composition.The oil potential of Eucalyptus globulus leaves was found to be in the range of 0.53-1.06 % (>1% in 13.33 % trees).The detected components in the extracted oils varied from 10 to 29 by GC/FID on Carbowax 20M packed glass column.All the oils were found containing only four/five major components that were alpha-pinene,beta-pinene,alpha-phalendrene,DELTA cerene,gamma-terpenene and 1,8-cineole.Concentration of alpha-pinene ranged between 1.68-26.96 % and 1,8-cineole ranged between 17.46-51.62 % whereas alpha-phalendrene ranged between 1.19-24.0 % in the oils of 9 trees and was 35.24 % in the oil of one tree.Oils of 33 % trees were found free from alpha-phalendrene.Oil of one tree was free from beta-pinene,in the remaining oils it ranged between 0.81-28.57 %.DELTA Cerene was found in the oils of two trees in the range of 2.77 % and 27.71 %.Oils of 47 % trees were found free from gamma-terpenene,whereas in 53 % trees it was found to be at a level of 5.34-49.24 %.