Table 2. The analytical conditions for gas chromatography.

Parameters	Conditions
Instrument	ACME 6500 Gas chromatography (Young Lin Co., Korea)
Detector	FID (Flame ionization detector)
Column	HP-FFAP (25 m×0.32 mm×0.52 μm, Supelco, USA)
Air & hydrogen flow rate	350 & 35 (mL/min)
Injector temperature	230°C (splitless mode)
Carrier gas	He
Flow rate	1.0 mL/min
Detector temperature	250°C (Temperature rising Mode)
Oven temperature	Hold 3 min at 40°C → increase 10°C/min up to 120°C → increase 5°C/min up to 200°C