2.3.2.2. GC-MS conditions. The analysis was carried out with Agilent 6890N/5973N GC-MSD(Santa Clara, CA, USA) Separations were performed using an Agilent HP-5MS capillary column(30 mx 250 um x 0.25 um). The GC oven temperature was programmed from 60 °C(3 min isothermal) to 200 °C at 8 °C min-1(2 min isothermal), 200-230 at 10 °C min(5 min isothermal) and finally 230-250 c at 10 °C min(1 min isothermal). Helium was the carrier gas at 1.0 ml min(37 cm/s) in constant flow mode. The injector temperature was set to 250 c and the split ratio was 1:50. The mass selective detector was equipped with a quadrupole mass analyzer and was operated in electron ionization mode at 70 ev. The MS was operated in full scan mode(41-500 amu at 3.2 scan/s), and data wer evaluated by MSD ChemStation D.02.00.275 software(Agilent). The identification of the compounds was carried out by comparing retention times, retention indices and recorded spectra with data known from the literature 19-21 and the NST 05 library were also consulted Percentage data of the total ion current chromatograms were calculated by the area normalizatioi method without applying response factor correction