Analyses were carried out on a ThermoQuest trace 2000 series gas chromatograph equipped with a ThermoQuest AS 2000 autosampler, a ThermoQuest ChromQuest data system (ThemoQuest Co, Milan, Italy) and a flame ionization detector (FID)
Analyseswere carried out on a ThermoQuest trace 2000 series gaschromatograph equipped with a ThermoQuest AS 2000 autosampler,a ThermoQuest ChromQuest data system (ThemoQuest Co,Milan, Italy) and a flame ionization detector (FID)