We used an HP 5890 GC with a flame ionization detector (FID)
and a split/splitless injection port, used in the split mode, with a
split vent flow of 40mL/min. The inlet liner was a deactivated
4mm ID split sleeve (cat.# 20781). The injector and detector
ports were set at 225°C and 230°C, respectively. The oven
temperature program was initially set at 165°C for the first 30
minutes, and then increased at a rate of 1.5°C/min to 220°C,
where it remained for the last 15 minutes. The carrier gas was
helium and the linear velocity of 40cm/sec. was measured at the
initial temperature.