A wet needle of the essential oil was inserted directly into the inlet
(spitless mode) of a Hewlett packard 6890 Gas chromatograph. The
temperature of the injection port was set at 220oC while the
pressure at the inlet was maintained at 3.96 psi. A HP-5MS (cross
linked 5% Phenyl Methyl Siloxane) column (30 m x 0.25 mm x 0.25
m film thickness) was temperature programmed from 60 to 150oC
at 3oC per min after a 3.5 min delay. Helium was also used as a
carrier gas at 0.7 ml/min. Mass spectra were recorded by a HP
5937 series mass selective detector (MSD).