*3.2. Sample Collection and FIR Treatment*

Six-year-old Korean ginseng leaves were used, which were collected from a ginseng farm in Wonju, Korea. Intact and undamaged leaves were washed with distilled water and then wiped with gauze. Fresh ginseng leaves were fully dried in an oven at 50 ◦C for 24 h and then ground using a grinder. The powder was meshed using a 200 μm sieve to obtain a uniform particle size of the powder. The powder was divided into two portions: (1) non-FIR-treated control (Con; 0) and (2) FIR treatments in an FIR dryer (HKD-10; Korea Energy Technology, Seoul, Korea) for 30 min at 160 ◦C (FIR-160), 170 ◦C (FIR-170), 180 ◦C (FIR-180), 190 ◦C (FIR-190), and 200 ◦C (FIR-200).
