All samples were methylated in duplicate, and 0.2 L was introduced by split injection into a fused silica capillary column (30 m × ID 0.25 mm, BPX 70; 0.25-m film thickness, Barcelona, Spain).
Allsamples were methylated in duplicate, and 0.2 L wasintroduced by split injection into a fused silica capillarycolumn (30 m × ID 0.25 mm, BPX 70; 0.25-m filmthickness, Barcelona, Spain).