The chromatographic conditions of the GC were optimized.
However, despite the analytical run time was 15 min, the total
analysis time for each analytical run was one hour because the
extraction time lasted 30 min, and after the analytical run the fibre
remains in the GC injector for another 15 min. Thus, the fibre was
activated for 30 min. To expedite the routine, this time can be optimized
with the use of more than one fibre or by using an autosampler
(Ashraf, Linforth, Bealin-Kelly, Smart & Taylor, 2010; Hill &
Smith, 2000).