The capillary column used was a
SUPELCOWAX 10 (30 m length, 0.53 mm i.d., and 1.0 μm
thickness) coated with polyethylene glycol. The chromatographic
conditions were as follows: injector temperature,
250°C; detector temperature, 250°C; oven temperature, set
initially at 60°C (1 min hold), increased to 200°C at 20°C/min
(1 min hold), increased to 240°C (14 min hold). Identification
of the different peaks was done by comparison with the retention
times of standards. Quantification was carried out by
area normalization.