PJB-2003-100
GENETIC VARIABILITY TO ESSENTIAL OIL CONTENTS AND COMPOSITION IN FIVE SPECIES OF EUCALYPTUS
ZAFAR IQBAL, IMTIAZ HUSSAIN*, A. HUSSAIN AND M. YASIN ASHRAF
Abstract
Essential oils from the leaves of Eucalyptus camaldulensi, Eucalyptus citriodora, Eucalyptus globulus, Eucalyptus crebra and Eucalyptus tereticornis were extracted by hydro-distillation. Maximum oil (1.47 %) was found in E. crebra and minimum (0.58 %) in E. tereticornis. Specific gravity of the oils ranged between 0.86 to 0.91, refractive index 1.42 to 1.44 and optical rotation -12.3 to 3.63 at 25 oC. Extracted oils were resolved and identified by GC/FID on Carbowex-20 M packed glass column. Maximum components (21) were detected in E.crebra and minimum (15) in E. citriodora and E. globulus oils, whereas in the oils of E. camaldulensis and E. tereticornis 16 and 19 components were resolved respectively. In E. camaldulensis, E. globulus and E. tereticornis oils five components (α -pinene, 3∆carene, ß-phellandrene
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