The analysis was carried out in a Thermo TRACE GC Ultra apparatus coupled to a Thermo ISQ mass detector, equipped with a Thermo TriPlus autosampler. Gas chromatography was carried in a Thermo Scientific fused-silica capillary column TG
WAXMS A (30m long; 0.25 mm OD; 0.25 mm film thickness). Chromatographic conditions were as follows: 5 min at 40 C, 3 C/min up to 200 C, 15 C/min up to 240 C,10 min at 240 C. Heliumwas used as carrier gas at a flow rate of 1 mL/min, operating in split mode (ratio 30).