The column was a capillary
column (VF-624ms, 30m× 0.25mmi.d., 1.4 μmfilmthickness) packed
with 6% cyanopropylphenyl–94% PDMS. Analyses were carried out at a
programmed temperature: initial temperature 40 °C (kept for
10 min), then increasing at a rate of 25 °C min−1 and final temperature
of 250 °C (kept for 3 min.).