Gas Chromatography Samples were analyzed on a GC-FID from Shimadzu equipped with a Phenomenex ZB-5MS (30 m x 0.25 mm x 0.25 µm) column. The following temperature programming was used: starting at 50 °C for 2 min, then 20 °C/min until 310 °C and hold for 5 min. The injector and the FID were both set at a temperature of 320 °C. A split ratio of 10 with a splitless sampling time of 1 min was used. Total flow was 21.6 mL/min with a linear velocity of 47.2 cm/s and a purge flow of 3 mL/min.