Table 2. Experimental conditions for coffee aroma analysis by GC-IMS

		conditions
GC Autosampler	Headspace vial	20 mL
	Incubation time	20 min
	Sample amount	0.3 g
	Incubation temperature	70℃
	Injector temperature	80℃
	Syringe temperature	80℃
	Sample amount	100 μL
	Agitation speed	400 rpm
GC Column	Capillary column	non-polar column constituted by 94% methyl, 5% phenyl, 1% vinyl silicone
	Length of column	15 m
	ID of column	0.32 mm
	Column temperature	80℃
	Runtime	30 min
IMS	Ionization source	Tritium 100 MBq
	Voltage	Positive drift
	Carrier gas flow(N2 gas)	1 mL/min 2 min -> 20 mL/min 15 min -> 20 mL/min 20 min -> 1 mL/min 22 min -> 11 mL/min 30 min
	Drift gas flow(N2 gas)	150 mL/min
	Drift tube temperature	45℃