All injections were done in the split mode (1:10) and the
sample volume was 2 ƒÊL. The total GC.FID run was 16.75 min. Comparative
analyses were performed on a GC7860/5742C MSD equippedwith an
HP5-MS column (20 m ~ 0.18 mm ID, 0.18 ƒÊm film thickness, Agilent,
Germany) under the same conditions as the GC.FID method