The quantitative analyses were performed using a Hewlett Packard GC-MS
5973 (column 5% Phenyl Methyl HP5MS Siloxane Capillary 30 m × 250 mm × 0.25 μm
nominal; temperature was programmed from 60 to 250°C with a ramp rate of 4°C, with a
final time of 5 min; injector and detector were maintained at 230 and 250°C respectively