2.7. GC-MS analysis of samples
The GC-MS analysis was performed in a gas chromatograph
(Perkin-Elmer, Autosystem XL) linked to a mass
spectrometer (Turbomass) available at the Industrial Toxicology
Research Centre, Lucknow, India. An aliquot of 2 mL
of extract was injected into the PE-5MS column of 20mm
0.18 mm internal diameter 0.18 mm film thickness glass
capillary column using the following temperature programme:
initial oven temperature of 40 C for 5 minutes,
increasing to 100 C at a rate of 7 C for 6 minutes, and then
to 250 C at a rate of 7 C for 9 minutes. The injector temperature
was maintained at 260 C. The interface temperature
was 250 C. Helium was used as a mobile phase at a
flowrate of 1.1 mL/min. Mass spectral detectionwas carried
out in electron ionization mode by scanning at 20 to 650
(m/z). Finally, unknown compounds were identified by
comparing the spectra with that of the National Institute of
Standard and Technology library. The total time required
for analyzing a single sample was w45 minutes. A blank
was run after every five samples.