Gas chromatography analysis (GC-FID)
The isolated oil was diluted with hexane, and 1.5μL
was sampled for the gas chromatographic analysis. Trace
GC gas chromatograph (ULTRA S/N 20062969, Thermo
Fischer) equipped with HP-5MS non polar fused silica
capillary column (50 m x 0.32 mm, film thickness 1.25
μm) was used. The operating conditions were as follows:
oven temperature program from 40°C (2 min) to 260°C at
4°C/min heating rate, kept for 10 min at the final
temperature, split injection ratio 1:20, carrier gas nitrogen,
flow rate 1mL/min, temperature of injector and detector
(FID) fixed at 260°C and 280°C, respectively.