Separation was achieved on a HP-Innowax fused-silica capillarycolumn
(30 m, 0.32 mmID, 0.5 lmfilm thickness; Agilent Technologies,
Palo Alto, CA, USA). The GC oven temperature programme
started at 40 C and arrived to 150 C at 2C min1, and then
increased at 6 C min1 to 250 C, which was maintained for
15 min.